Some standard content:
HG/T2826-1997
The superior products of this standard are equivalent to the Russian standard rOCT11683:1976 (revised in 1989) "Industrial Sodium Metabisulfite". This standard is a revision of (HB/T6010-1985 "Industrial Sodium Coke Sulfate". 1 The main technical differences between this standard and the Russian standard TOCT11683:1976 (revised in 1989) Industrial Sodium Metabisulfite: The Russian standard has only two levels: level one and level two. According to my country's production situation and user needs, this standard is divided into three levels: superior products, first-class products, and qualified products. The main content index of superior products is higher than that of the first-class products of the Russian standard, and the other indicators are the same as its first-class products. The superior products have reached the current international Advanced level. The main content index of the first-class products of this standard is close to the main content index of the first-class products of the Russian standard. Except for the arsenic content, all other indicators are the same as those of the first-class products. The first-class products have reached the current international general level. Except for the arsenic content, all other indicators of the qualified products of this standard are the same as those of the second-class products of the Russian standard. The qualified products have reached the domestic advanced level. 2 The main technical differences between this standard and the original national standard GB/T6010--1985 industrial sodium metabisulfite: 2.1 The original national standard has two levels: first level and second level. This standard has three levels: excellent 2.2 The superior products in this standard have one more arsenic content index than the original national standard. 2.3 The main content of the original national standard is calculated in sulfur dioxide. In order to adopt the Russian standard equivalently, the main content of this standard is calculated in sodium metabisulfite. 2.4 Since the main content index is reached, the pH value must meet the requirements. This standard cancels the pH value index and test method. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. Drafting unit of this standard: Tianjin Chemical Research Institute of the Ministry of Chemical Industry , Shanghai Malu Chemical Plant, Hunan Changsha Xiangyue Chemical Plant, Shanghai Sulfuric Acid Plant.
The main drafters of this standard are Jiang Junhua, Yang Zhongde, Chen Yaoxing, Yi Guojun, Zong Kejian. From the date of entry into force of this standard, it will replace GB/T6010-1985 "Industrial Sodium Pyrosulfite". This standard is entrusted to the technical unit responsible for standardization of inorganic salt products of the Ministry of Chemical Industry for interpretation. 693
1 Scope
Chemical Industry Standard of the People's Republic of China
Industrial Sodium Pyrosulfite
Sodium metabisulphite for industrial useHG/T 2826—1997
Replaces GB/T6010--1985
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of industrial sodium metabisulfite. This standard applies to industrial sodium metabisulfite, which is mainly used in printing and dyeing, organic synthesis, printing, leather making, pharmaceutical and other industries. Molecular formula: Na2 S, Os
Relative molecular mass: 190.10 (according to the 1993 international relative atomic mass) 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB191--1990 Pictorial markings for packaging, storage and transportation
GB/T601-1988 Preparation of standard solutions for titration analysis (volumetric analysis) of chemical reagents GB/T602-1988 Preparation of standard solutions for determination of impurities in chemical reagents (neqISO6353-1; 1982) GB/T 603-1988
Preparation of preparations and products used in test methods for chemical reagents (neg1SO6353-1: 1982) GB/T 610. 1-1988
GB/T 1250--1989
GB/T 3049--1986
G13/T 6678-1986
GB/T 6682-1992
GB/T 8946--1988
GB/T 8947—1988
3 Requirements
General method for determination of arsenic content in chemical reagents (arsenic spot method) Expression and determination method of limit values General method for determination of iron content in chemical products O-phenanthroline spectrophotometry (neq1SO6685-1:1982)
General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987) Plastic woven bags
Composite plastic woven bags
3.1 Appearance: Industrial sodium pyrosulfite is white or slightly yellow crystalline powder. 3.2 Industrial sodium pyrosulfite should meet the requirements of Table 1. Table 1
Main content (in NazS,O,)
Iron (in Fe) content
Water insoluble matter content
Monument (in As) content
Superior product
Approved by the Ministry of Chemical Industry of the People's Republic of China on February 4, 1997694
Qualified product
Implemented on October 1, 1997
4 Sampling
4.1 Each batch of products shall not exceed 50t.
HG/T 2826—1997
4.2 Determine the number of sampling units in accordance with the provisions of 6.6 in GB/T6678.--1986. Each plastic woven bag is a packaging unit. When sampling, insert the sampler obliquely from the top of the packaging bag to 3/4 of the depth of the material layer to take a sample. Take out a sample of no less than 50g from each selected packaging unit, mix the sample thoroughly, and use the quartering method to reduce it to about 500g. Immediately put it into two clean, dry wide-mouth bottles and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used as a laboratory sample, and the other bottle is kept for reference for months.
4.3 Test results If any index does not meet the requirements of this standard, re-sample and verify from twice the number of sampling units. If the verification results show that only one index does not meet the requirements of this standard, the entire batch of products is unqualified. 5 Test methods
5.1 All four index items specified in this standard are type test items, of which the main content, iron content, and water-insoluble content are routine test items and should be tested batch by batch. Under normal production conditions, type tests are carried out once a month. 5.2 The rounded value comparison method specified in 5.2 of GB/T1250-1989 is used to determine whether the test results meet the standard. 5.3 The reagents and water used in this standard, unless otherwise specified, refer to analytically pure reagents and grade 3 water specified in GB/T6682. The standard titration solutions, impurity standard solutions, preparations and products used in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603.
5.4 Determination of main content
5.4.1 Summary of the method
In a weakly acidic solution, sulfite is oxidized to sulfate with iodine. Using starch as an indicator, the excess iodine is titrated with sodium thiosulfate standard titration solution.
5.4.2 Reagents and materials
5.4.2.1 Standard iodine titration solution: c(1/2I2) about 0.1mol/L;5.4.2.2 Glacial acetic acid solution: 1+3;
5.4.2.3 Standard sodium thiosulfate titration solution: c(NazS,O.) about 0.1mol/L;5.4.2.4 Soluble starch solution: 5g/L. 5.4.3 Instruments and equipment
General laboratory instruments and equipment.
5.4.4 Analysis steps
Use a pipette to transfer 50ml of standard iodine titration solution into an iodine volumetric flask. Quickly weigh about 0.2g of the sample (accurate to 0.0002g), add it to the iodine solution, add a stopper and place it in a dark place for 5min. Add 5 mL of glacial acetic acid and titrate with sodium thiosulfate standard titration solution. When near the end point, add 2 mL of starch indicator and continue titrating until the blue color of the solution disappears. At the same time, use a pipette to transfer 50 mL of iodine standard titration solution. Perform a blank test under the same conditions, but without adding the sample. 5.4.5 Expression of analytical results
The main content (in terms of NazS,O,) X, expressed as mass percentage, is calculated according to formula (1): Xi 0. 047 52 × (V.-Vi × 100m
4. 752 × (V.-Vi)c
Where: V. is the volume of sodium thiosulfate standard titration solution consumed in the blank test, mL; V,-—Volume of sodium thiosulfate standard titration solution consumed by the titration sample, ml; c—---Actual concentration of sodium thiosulfate standard titration solution, mol/L; (1)
Mass of sample, g
HG/T 28261997
Mass of sodium metabisulfite expressed in grams equivalent to 1.00mL sodium thiosulfate standard titration solution c (NazSO.)-1.000mol/l.
5.4.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.2%. 5.5 Determination of iron content
5.5.1 Summary of method
Same as Chapter 2 of GB/T3049-1986.
5.5.2 Reagents and materials
Same as Chapter 3 of GB/T3049-1986.
5.5.3 Instruments and equipment
Same as Chapter 4 of GB/T3049-1986.
5.5.4 Analysis steps
5.5.4.1 Drawing of working curve
Draw the working curve using a 3cm absorption cell and the corresponding amount of iron standard solution according to the provisions of 5.3 of GB/T3049-1986.
5.5.4.2 Preparation of test solution
Weigh about 5g of sample (accurate to 0.001g), place it in a 250mL tall beaker, dissolve it with a small amount of water, add 25ml of concentrated hydrochloric acid, evaporate it to dryness in a boiling water bath, dissolve the residue with water, transfer all of it to a 250ml volumetric flask, dilute it to the scale with water, and shake it. 5.5.4.3 Preparation of blank test solution
In a 250mL tall beaker, add a small amount of water and then 25mL of concentrated hydrochloric acid. Evaporate to dryness in a boiling water bath. Dissolve the residue with water and transfer all to a 250mL volumetric flask. Dilute to the mark with water and shake well. 5.5.4.4 Measurement
Use a pipette to transfer 50 mL of the test solution (5.5.4.2) and the blank test solution (5.5.4.3) respectively into 100 mL volumetric flasks. Then proceed as per 5.3.2 of GB/T3049-1986, starting from "add water to about 60 mL...". 5.5.5 Expression of analysis results
The iron (Fe) content X2 expressed as mass percentage is calculated according to formula (2): X2 =
-×100
50×1000
m×250
0. 5 X(m) - m2)
The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: mi-
The amount of iron found from the working curve based on the measured absorbance of the blank test solution, mg; The mass of the sample, g.
5.5.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.0005%. 5.6 Determination of water-insoluble matter content
5.6.1 Instruments and equipment||tt| |5.6.1.1 General laboratory instruments and equipment;
5.6.1.2 Glass crucible: 5μm~15μm. 5.6.2 Analysis steps
(2)
Weigh about 20g of sample (accurate to 0.01g), place it in a 400ml beaker, dissolve it with about 100ml of water, place it in a hot water bath for 0.5h, remove it, cool it, filter it with a glass crucible that has been dried to constant weight at 105℃~~110℃, and wash the residue with 60℃~~80℃ water696
HG/T 2826—1997
4 to 5 times, dry the crucible and the residue at 105℃～110℃ to constant weight. 5.6.3 Expression of analytical results
Water-insoluble content X expressed as mass percentage: calculated according to formula (3): Xs=m2=ml×100
Wherein: m-mass of glass crucible, g;
m?—mass of water-insoluble matter and glass crucible, g; m—mass of sample, g.
5.6.4 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.005%. 5.7 Determination of arsenic content
5.7.1 Summary of the method
Same as (Chapter 3 of GB/T610.1—1988.
5.7.2 Reagents Materials
5.7.2.1 Hydrochloric acid;
5.7.2.2 Nitric acid;
5.7.2.3 Sulfuric acid;
5.7.2.4 Potassium iodide;
5.7.2.5 Arsenic-free zinc granules;
5.7.2.6 Stannous chloride solution: 400g/1.:·(3)
Weigh about 40g of stannous chloride (SnClz·2H,O) (accurate to 0.1g), put it in a beaker, add 40ml of hydrochloric acid to dissolve it, and dilute it with water to 100mL.
5.7.2.7 Lead acetate cotton;
5.7.2.8 Mercury bromide test paper;
5.7.2.9 Monument standard solution: 0.0010mgAs/mL. Prepare before use. Use a pipette to transfer 10mL of the arsenic standard solution prepared according to GB/T602 into a 1000mL volumetric flask, dilute with water to the mark, and shake well.
5.7.3 Instruments and equipment
Same as Chapter 5 of GB/T610.1-1988.
5.7.4 Analysis steps
Weigh 1g of sample (accurate to 0.01g), place it in a 250ml beaker, and add 5ml of water to dissolve it. Add 2ml of nitric acid and 1mL of sulfuric acid, and evaporate it to dryness on a water bath. Add 25ml of water in batches to dissolve the residue, transfer all of it into the conical flask of the arsenic measuring device, add 3ml of hydrochloric acid, and shake well. Add 1g of potassium iodide and 0.2ml of stannous chloride solution, and shake well. After leaving it for 10 minutes, add 3g of arsenic-free zinc particles, and immediately install the arsenic measuring tube pre-installed with lead acetate cotton and mercuric bromide test paper. Place in a dark place at 25℃～30℃ for 1h～1.5h. Take out the mercuric bromide test paper and compare it with the standard color spot. It shall not be darker than the standard.
The standard is to use a pipette to transfer 1mL of arsenic standard solution, place it in the conical bottle of the arsenic measuring device, add 25mL of water, and the following operations start from "add 3ml. hydrochloric acid·\ and treat it at the same time as the test solution. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial sodium metabisulfite should have firm and clear markings, including: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production date, this standard number, and the "afraid of moisture" mark specified in 7 of GB191-1990. 6.2 Each batch of products shipped out of the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production date, product quality compliance certificate and this standard number. 697
HG/T2826—1997
6.3 Industrial sodium metabisulfite is double-packed, the inner packing is polyethylene plastic film bag, the thickness is not less than 0.07mm, the outer packing is plastic woven bag or composite plastic woven bag, the performance and inspection method shall comply with the provisions of GB/T8946B bag and GB/T8947. The net weight of each bag is 25kg or 50kg.
6.4 When packing, put industrial sodium metabisulfite into the inner bag, discharge the residual air in the bag, tie the inner bag with vinyl rope or other rope of equivalent quality, fold the outer bag at a distance of not less than 30mm from the bag edge, and sew the outer bag with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat and the stitch length is uniform. There is no leakage and jumper phenomenon. 6.5 Industrial sodium metabisulfite should be protected from rain, moisture, exposure and packaging damage during transportation. 6.6 Industrial sodium metabisulfite should be stored in a ventilated, dry, non-corrosive warehouse. 6.7 The shelf life of industrial sodium metabisulfite is six months from the date of production.3, use a 3cm absorption cell and the corresponding amount of iron standard solution to draw a working curve.
5.5.4.2 Preparation of test solution
Weigh about 5g of the sample (accurate to 0.001g), place it in a 250mL tall beaker, dissolve it with a small amount of water, add 25mL of concentrated hydrochloric acid, evaporate it to dryness in a boiling water bath, dissolve the residue with water, transfer all of it to a 250mL volumetric flask, dilute it to the scale with water, and shake it. 5.5.4.3 Preparation of blank test solution
In a 250mL tall beaker, add a small amount of water, then add 25mL of concentrated hydrochloric acid, evaporate it to dryness in a boiling water bath, dissolve the residue with water, transfer all of it to a 250mL volumetric flask, dilute it to the scale with water, and shake it well. 5.5.4.4 Measurement
Use a pipette to transfer 50 mL of the test solution (5.5.4.2) and the blank test solution (5.5.4.3) respectively into 100 mL volumetric flasks. Then proceed as per 5.3.2 of GB/T3049-1986, starting from "add water to about 60 mL...". 5.5.5 Expression of analysis results
The iron (Fe) content X2 expressed as mass percentage is calculated according to formula (2): X2 =
-×100
50×1000bzxz.net
m×250
0. 5 X(m) - m2)
The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: mi-
The amount of iron found from the working curve based on the measured absorbance of the blank test solution, mg; The mass of the sample, g.
5.5.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.0005%. 5.6 Determination of water-insoluble matter content
5.6.1 Instruments and equipment||tt| |5.6.1.1 General laboratory instruments and equipment;
5.6.1.2 Glass crucible: 5μm~15μm. 5.6.2 Analysis steps
(2)
Weigh about 20g of sample (accurate to 0.01g), place it in a 400ml beaker, dissolve it with about 100ml of water, place it in a hot water bath for 0.5h, remove it, cool it, filter it with a glass crucible that has been dried to constant weight at 105℃~~110℃, and wash the residue with 60℃~~80℃ water696
HG/T 2826—1997
4 to 5 times, dry the crucible and the residue at 105℃～110℃ to constant weight. 5.6.3 Expression of analytical results
Water-insoluble content X expressed as mass percentage: calculated according to formula (3): Xs=m2=ml×100
Wherein: m-mass of glass crucible, g;
m?—mass of water-insoluble matter and glass crucible, g; m—mass of sample, g.
5.6.4 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.005%. 5.7 Determination of arsenic content
5.7.1 Summary of the method
Same as (Chapter 3 of GB/T610.1—1988.
5.7.2 Reagents Materials
5.7.2.1 Hydrochloric acid;
5.7.2.2 Nitric acid;
5.7.2.3 Sulfuric acid;
5.7.2.4 Potassium iodide;
5.7.2.5 Arsenic-free zinc granules;
5.7.2.6 Stannous chloride solution: 400g/1.:·(3)
Weigh about 40g of stannous chloride (SnClz·2H,O) (accurate to 0.1g), put it in a beaker, add 40ml of hydrochloric acid to dissolve it, and dilute it with water to 100mL.
5.7.2.7 Lead acetate cotton;
5.7.2.8 Mercury bromide test paper;
5.7.2.9 Monument standard solution: 0.0010mgAs/mL. Prepare before use. Use a pipette to transfer 10mL of the arsenic standard solution prepared according to GB/T602 into a 1000mL volumetric flask, dilute with water to the mark, and shake well.
5.7.3 Instruments and equipment
Same as Chapter 5 of GB/T610.1-1988.
5.7.4 Analysis steps
Weigh 1g of sample (accurate to 0.01g), place it in a 250ml beaker, and add 5ml of water to dissolve it. Add 2ml of nitric acid and 1mL of sulfuric acid, and evaporate it to dryness on a water bath. Add 25ml of water in batches to dissolve the residue, transfer all of it into the conical flask of the arsenic measuring device, add 3ml of hydrochloric acid, and shake well. Add 1g of potassium iodide and 0.2ml of stannous chloride solution, and shake well. After leaving it for 10 minutes, add 3g of arsenic-free zinc particles, and immediately install the arsenic measuring tube pre-installed with lead acetate cotton and mercuric bromide test paper. Place in a dark place at 25℃～30℃ for 1h～1.5h. Take out the mercuric bromide test paper and compare it with the standard color spot. It shall not be darker than the standard.
The standard is to use a pipette to transfer 1mL of arsenic standard solution, place it in the conical bottle of the arsenic measuring device, add 25mL of water, and the following operations start from "add 3ml. hydrochloric acid·\ and treat it at the same time as the test solution. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial sodium metabisulfite should have firm and clear markings, including: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production date, this standard number, and the "afraid of moisture" mark specified in 7 of GB191-1990. 6.2 Each batch of products shipped out of the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production date, product quality compliance certificate and this standard number. 697
HG/T2826—1997
6.3 Industrial sodium metabisulfite is double-packed, the inner packing is polyethylene plastic film bag, the thickness is not less than 0.07mm, the outer packing is plastic woven bag or composite plastic woven bag, the performance and inspection method shall comply with the provisions of GB/T8946B bag and GB/T8947. The net weight of each bag is 25kg or 50kg.
6.4 When packing, put industrial sodium metabisulfite into the inner bag, discharge the residual air in the bag, tie the inner bag with vinyl rope or other rope of equivalent quality, fold the outer bag at a distance of not less than 30mm from the bag edge, and sew the outer bag with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat and the stitch length is uniform. There is no leakage and jumper phenomenon. 6.5 Industrial sodium metabisulfite should be protected from rain, moisture, exposure and packaging damage during transportation. 6.6 Industrial sodium metabisulfite should be stored in a ventilated, dry, non-corrosive warehouse. 6.7 The shelf life of industrial sodium metabisulfite is six months from the date of production.3, use a 3cm absorption cell and the corresponding amount of iron standard solution to draw a working curve.
5.5.4.2 Preparation of test solution
Weigh about 5g of the sample (accurate to 0.001g), place it in a 250mL tall beaker, dissolve it with a small amount of water, add 25mL of concentrated hydrochloric acid, evaporate it to dryness in a boiling water bath, dissolve the residue with water, transfer all of it to a 250mL volumetric flask, dilute it to the scale with water, and shake it. 5.5.4.3 Preparation of blank test solution
In a 250mL tall beaker, add a small amount of water, then add 25mL of concentrated hydrochloric acid, evaporate it to dryness in a boiling water bath, dissolve the residue with water, transfer all of it to a 250mL volumetric flask, dilute it to the scale with water, and shake it well. 5.5.4.4 Measurement
Use a pipette to transfer 50 mL of the test solution (5.5.4.2) and the blank test solution (5.5.4.3) respectively into 100 mL volumetric flasks. Then proceed as per 5.3.2 of GB/T3049-1986, starting from "add water to about 60 mL...". 5.5.5 Expression of analysis results
The iron (Fe) content X2 expressed as mass percentage is calculated according to formula (2): X2 =
-×100
50×1000
m×250
0. 5 X(m) - m2)
The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: mi-
The amount of iron found from the working curve based on the measured absorbance of the blank test solution, mg; The mass of the sample, g.
5.5.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.0005%. 5.6 Determination of water-insoluble matter content
5.6.1 Instruments and equipment||tt| |5.6.1.1 General laboratory instruments and equipment;
5.6.1.2 Glass crucible: 5μm~15μm. 5.6.2 Analysis steps
(2)
Weigh about 20g of sample (accurate to 0.01g), place it in a 400ml beaker, dissolve it with about 100ml of water, place it in a hot water bath for 0.5h, remove it, cool it, filter it with a glass crucible that has been dried to constant weight at 105℃~~110℃, and wash the residue with 60℃~~80℃ water696
HG/T 2826—1997
4 to 5 times, dry the crucible and the residue at 105℃～110℃ to constant weight. 5.6.3 Expression of analytical results
Water-insoluble content X expressed as mass percentage: calculated according to formula (3): Xs=m2=ml×100
Wherein: m-mass of glass crucible, g;
m?—mass of water-insoluble matter and glass crucible, g; m—mass of sample, g.
5.6.4 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.005%. 5.7 Determination of arsenic content
5.7.1 Summary of the method
Same as (Chapter 3 of GB/T610.1—1988.
5.7.2 Reagents Materials
5.7.2.1 Hydrochloric acid;
5.7.2.2 Nitric acid;
5.7.2.3 Sulfuric acid;
5.7.2.4 Potassium iodide;
5.7.2.5 Arsenic-free zinc granules;
5.7.2.6 Stannous chloride solution: 400g/1.:·(3)
Weigh about 40g of stannous chloride (SnClz·2H,O) (accurate to 0.1g), put it in a beaker, add 40ml of hydrochloric acid to dissolve it, and dilute it with water to 100mL.
5.7.2.7 Lead acetate cotton;
5.7.2.8 Mercury bromide test paper;
5.7.2.9 Monument standard solution: 0.0010mgAs/mL. Prepare before use. Use a pipette to transfer 10mL of the arsenic standard solution prepared according to GB/T602 into a 1000mL volumetric flask, dilute with water to the mark, and shake well.
5.7.3 Instruments and equipment
Same as Chapter 5 of GB/T610.1-1988.
5.7.4 Analysis steps
Weigh 1g of sample (accurate to 0.01g), place it in a 250ml beaker, and add 5ml of water to dissolve it. Add 2ml of nitric acid and 1mL of sulfuric acid, and evaporate it to dryness on a water bath. Add 25ml of water in batches to dissolve the residue, transfer all of it into the conical flask of the arsenic measuring device, add 3ml of hydrochloric acid, and shake well. Add 1g of potassium iodide and 0.2ml of stannous chloride solution, and shake well. After leaving it for 10 minutes, add 3g of arsenic-free zinc particles, and immediately install the arsenic measuring tube pre-installed with lead acetate cotton and mercuric bromide test paper. Place in a dark place at 25℃～30℃ for 1h～1.5h. Take out the mercuric bromide test paper and compare it with the standard color spot. It shall not be darker than the standard.
The standard is to use a pipette to transfer 1mL of arsenic standard solution, place it in the conical bottle of the arsenic measuring device, add 25mL of water, and the following operations start from "add 3ml. hydrochloric acid·\ and treat it at the same time as the test solution. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial sodium metabisulfite should have firm and clear markings, including: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production date, this standard number, and the "afraid of moisture" mark specified in 7 of GB191-1990. 6.2 Each batch of products shipped out of the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production date, product quality compliance certificate and this standard number. 697
HG/T2826—1997
6.3 Industrial sodium metabisulfite is double-packed, the inner packing is polyethylene plastic film bag, the thickness is not less than 0.07mm, the outer packing is plastic woven bag or composite plastic woven bag, the performance and inspection method shall comply with the provisions of GB/T8946B bag and GB/T8947. The net weight of each bag is 25kg or 50kg.
6.4 When packing, put industrial sodium metabisulfite into the inner bag, discharge the residual air in the bag, tie the inner bag with vinyl rope or other rope of equivalent quality, fold the outer bag at a distance of not less than 30mm from the bag edge, and sew the outer bag with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat and the stitch length is uniform. There is no leakage and jumper phenomenon. 6.5 Industrial sodium metabisulfite should be protected from rain, moisture, exposure and packaging damage during transportation. 6.6 Industrial sodium metabisulfite should be stored in a ventilated, dry, non-corrosive warehouse. 6.7 The shelf life of industrial sodium metabisulfite is six months from the date of production.2 Analysis steps
(2)
Weigh about 20g of sample (accurate to 0.01g), place it in a 400ml beaker, dissolve it with about 100ml of water, place it in a hot water bath for 0.5h, remove it, cool it, and filter it through a glass crucible that has been dried to constant weight at 105℃~~110℃. Wash the residue with 60℃~~80℃ water 696
HG/T 2826—1997
4~5 times, and dry the crucible and the residue at 105℃~110℃ to constant weight. 5.6.3 Expression of analysis results
Content X of water-insoluble matter expressed as mass percentage: Calculate according to formula (3): Xs=m2=ml×100
Wherein: m-mass of glass crucible, g;
m?—mass of water-insoluble matter and glass crucible, g; m—mass of sample, g.
5.6.4 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.005%. 5.7 Determination of arsenic content
5.7.1 Summary of the method
Same as (Chapter 3 of GB/T610.1-1988).
5.7.2 Reagents and materials
5.7.2.1 Hydrochloric acid;
5.7.2.2 Nitric acid;
5.7.2.3 Sulfuric acid;
5.7.2.4 Potassium iodide;
5.7.2.5 Arsenic-free zinc particles;
5.7.2.6 Stannous chloride solution: 400g/1.:·(3)
Weigh about 40g of stannous chloride (SnCl2·2H,O) (accurate to 0.1g), put it in a beaker, add 40ml of hydrochloric acid to dissolve it, and dilute it with water to 100 mL.
5.7.2.7 Lead acetate cotton;
5.7.2.8 Mercury bromide test paper;
5.7.2.9 Arsenic standard solution: 0.0010mgAs/mL. Prepare immediately before use. Use a pipette to transfer 10mL of the arsenic standard solution prepared according to GB/T602 into a 1000mL volumetric flask, dilute to the mark with water, and shake well.
5.7.3 Instruments and equipment
Same as Chapter 5 of GB/T610.1-1988.
5.7.4 Analysis steps
Weigh Place 1g of sample (accurate to 0.01g) in a 250ml beaker and add 5ml of water to dissolve. Add 2ml of nitric acid and 1mL of sulfuric acid and evaporate to dryness in a water bath. Add 25ml of water in batches to dissolve the residue, transfer all of it into the conical flask of the arsenic measuring device, add 3ml of hydrochloric acid and shake well. Add 1g of potassium iodide and 0.2ml of stannous chloride solution and shake well. After leaving for 10 minutes, add 3g of arsenic-free zinc particles and immediately install the arsenic measuring tube pre-installed with lead acetate cotton and mercuric bromide test paper. Place in a dark place at 25℃~30℃ for 1h~1.5h. Remove the mercuric bromide test paper and compare it with the standard color spot. The standard is to use a pipette to transfer 1 mL of arsenic standard solution, place it in the conical bottle of the arsenic measuring device, add 25 mL of water, and the following operations start from "add 3 mL of hydrochloric acid" and treat it at the same time as the test solution. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial sodium metabisulfite should have firm and clear markings, including: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production date, this standard number, and the "wet-afraid" mark specified in 7 of GB191-1990. 6.2 Each batch of products leaving the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production period, product quality certification containing this standard and this standard number. 697
HG/T2826—1997
6.3 Industrial sodium metabisulfite is double-packed, the inner packaging is polyethylene plastic film bag, the thickness is not less than 0.07mm, the outer packaging is plastic woven bag or composite plastic woven bag, its performance and inspection method should comply with GB/T8946B bag and GB/T8947 regulations. The net weight of each bag is 25kg or 50kg.
6.4 When packaging, put the industrial sodium metabisulfite into the inner bag, exhaust the remaining air in the bag, tie the inner bag with vinyl rope or other rope of equivalent quality, fold the outer bag at a distance of not less than 30mm from the bag edge, and sew the outer bag with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm to 12mm, the stitches are neat and the stitch length is even. There is no leakage or skipping. 6.5 Industrial sodium pyrosulfite should be protected from rain, moisture, exposure to sunlight and packaging damage during transportation. 6.6 Industrial sodium pyrosulfite should be stored in a ventilated, dry and non-corrosive warehouse. 6.7 The shelf life of industrial sodium pyrosulfite is six months from the date of production.2 Analysis steps
(2)
Weigh about 20g of sample (accurate to 0.01g), place it in a 400ml beaker, dissolve it with about 100ml of water, place it in a hot water bath for 0.5h, remove it, cool it, and filter it through a glass crucible that has been dried to constant weight at 105℃~~110℃. Wash the residue with 60℃~~80℃ water 696
HG/T 2826—1997
4~5 times, and dry the crucible and the residue at 105℃~110℃ to constant weight. 5.6.3 Expression of analysis results
Content X of water-insoluble matter expressed as mass percentage: Calculate according to formula (3): Xs=m2=ml×100
Wherein: m-mass of glass crucible, g;
m?—mass of water-insoluble matter and glass crucible, g; m—mass of sample, g.
5.6.4 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.005%. 5.7 Determination of arsenic content
5.7.1 Summary of the method
Same as (Chapter 3 of GB/T610.1-1988).
5.7.2 Reagents and materials
5.7.2.1 Hydrochloric acid;
5.7.2.2 Nitric acid;
5.7.2.3 Sulfuric acid;
5.7.2.4 Potassium iodide;
5.7.2.5 Arsenic-free zinc particles;
5.7.2.6 Stannous chloride solution: 400g/1.:·(3)
Weigh about 40g of stannous chloride (SnCl2·2H,O) (accurate to 0.1g), put it in a beaker, add 40ml of hydrochloric acid to dissolve it, and dilute it with water to 100 mL.
5.7.2.7 Lead acetate cotton;
5.7.2.8 Mercury bromide test paper;
5.7.2.9 Arsenic standard solution: 0.0010mgAs/mL. Prepare immediately before use. Use a pipette to transfer 10mL of the arsenic standard solution prepared according to GB/T602 into a 1000mL volumetric flask, dilute to the mark with water, and shake well.
5.7.3 Instruments and equipment
Same as Chapter 5 of GB/T610.1-1988.
5.7.4 Analysis steps
Weigh Place 1g of sample (accurate to 0.01g) in a 250ml beaker and add 5ml of water to dissolve. Add 2ml of nitric acid and 1mL of sulfuric acid and evaporate to dryness in a water bath. Add 25ml of water in batches to dissolve the residue, transfer all of it into the conical flask of the arsenic measuring device, add 3ml of hydrochloric acid and shake well. Add 1g of potassium iodide and 0.2ml of stannous chloride solution and shake well. After leaving for 10 minutes, add 3g of arsenic-free zinc particles and immediately install the arsenic measuring tube pre-installed with lead acetate cotton and mercuric bromide test paper. Place in a dark place at 25℃~30℃ for 1h~1.5h. Remove the mercuric bromide test paper and compare it with the standard color spot. The standard is to use a pipette to transfer 1 mL of arsenic standard solution, place it in the conical bottle of the arsenic measuring device, add 25 mL of water, and the following operations start from "add 3 mL of hydrochloric acid" and treat it at the same time as the test solution. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial sodium metabisulfite should have firm and clear markings, including: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production date, this standard number, and the "wet-afraid" mark specified in 7 of GB191-1990. 6.2 Each batch of products leaving the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, grade, trademark, net weight, batch number or production period, product quality certification of this standard and this standard number. 697
HG/T2826—1997
6.3 Industrial sodium metabisulfite is double-packed, the inner packaging is polyethylene plastic film bag, the thickness is not less than 0.07mm, the outer packaging is plastic woven bag or composite plastic woven bag, its performance and inspection method should comply with GB/T8946B bag and GB/T8947 regulations. The net weight of each bag is 25kg or 50kg.
6.4 When packaging, put industrial sodium metabisulfite into the inner bag, exhaust the remaining air in the bag, tie the inner bag with vinyl rope or other rope of equivalent quality, fold the outer bag at a distance of not less than 30mm from the bag edge, and sew the outer bag with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm to 12mm, the stitches are neat and the stitch length is even. There is no leakage or skipping. 6.5 Industrial sodium pyrosulfite should be protected from rain, moisture, exposure to sunlight and packaging damage during transportation. 6.6 Industrial sodium pyrosulfite should be stored in a ventilated, dry and non-corrosive warehouse. 6.7 The shelf life of industrial sodium pyrosulfite is six months from the date of production.4 When packaging, put industrial sodium metabisulfite into the inner bag, exhaust the remaining air in the bag, tie the inner bag with vinyl rope or other rope of equivalent quality, fold the outer bag at a distance of not less than 30mm from the bag edge, and sew the outer bag with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat and the stitch length is uniform. There is no leakage or skipping. 6.5 Industrial sodium metabisulfite should be protected from rain, moisture, exposure and packaging damage during transportation. 6.6 Industrial sodium metabisulfite should be stored in a ventilated, dry and non-corrosive warehouse. 6.7 The shelf life of industrial sodium metabisulfite is six months from the date of production.4 When packaging, put industrial sodium metabisulfite into the inner bag, exhaust the remaining air in the bag, tie the inner bag with vinyl rope or other rope of equivalent quality, fold the outer bag at a distance of not less than 30mm from the bag edge, and sew the outer bag with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat and the stitch length is uniform. There is no leakage or skipping. 6.5 Industrial sodium metabisulfite should be protected from rain, moisture, exposure and packaging damage during transportation. 6.6 Industrial sodium metabisulfite should be stored in a ventilated, dry and non-corrosive warehouse. 6.7 The shelf life of industrial sodium metabisulfite is six months from the date of production.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.