Some standard content:
Record number: 2783-1999
HG/T3595---1999
This standard is mainly formulated based on domestic enterprise standards. Preface
The main technical differences between this standard and the enterprise standard are as follows: Preface
This standard is divided into two types: Type I is anhydrous calcium nitrite; Type II is tetrahydrate calcium nitrite. The enterprise standard stipulates three levels; this industry standard stipulates two levels of first-class products and qualified products, and the index items are the same as the enterprise standard. The method for determining the content of calcium nitrite adopts the potassium permanganate redox titration method. The method for determining the content of calcium nitrate adopts the potassium permanganate back titration method. The method for determining the content of water and water-insoluble matter adopts the weight method. This standard was proposed by the Technical Supervision Department of the former Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Inorganic Chemical Branch of the National Technical Committee for Chemical Standardization. The drafting units of this standard: Tianjin Chemical Research and Design Institute of the Ministry of Chemical Industry, Sichuan Yanting Chemical Co., Ltd., and Hangzhou Longshan Chemical General Plant. The main drafters of this standard are Li Guangming, Li Xianju, Pu Yong and Liang Qiong. This standard is entrusted to the Inorganic Chemical Branch of the National Technical Committee for Chemical Standardization to interpret 1128
Chemical Industry Standard of the People's Republic of China
Industrial Calcium Nitrite
Calcium nitrite for industrial useHG/T 3595—1999
This standard specifies the requirements, test methods, inspection rules, marking, labeling, packaging, transportation and storage of industrial calcium nitrite. This standard is applicable to industrial calcium nitrite prepared by the reaction of calcium oxide and nitrogen oxide gas. This product is mainly used as raw materials for cement additives, rust inhibitors, antifreeze agents, heavy oil detergents, lubricating oil emulsifiers, etc. Molecular formula: Ca(NO,)2 or Ca(NO,)2·4H,O Relative molecular mass: 132.09 or 204.15 (according to the 1995 international relative atomic mass) 2 Referenced 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. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB190—1990 Dangerous Goods Packaging Marking
GB191-1990 Pictorial Marking for Packaging Storage and Transportation
GB/T601—1988 Preparation of Standard Solutions for Titration Analysis (Volumetric Analysis) of Chemical Reagents GB/T603—1988 Preparation of Preparations and Products Used in Chemical Reagent Test Methods (neqISO6353-1:1982) 9 Methods for Representing and Determining Limit Values GB/T 1250—1989
GB/T6678—1986 General Rules for Sampling of Chemical Products GB/T6682—1992 Specifications and Test Methods for Water Used in Analytical Laboratories (eqvISO3696:1987) 3 Requirements
3.1 Appearance: Anhydrous calcium nitrite is white powder; tetrahydrate calcium nitrite is light yellow crystals. 3.2 Industrial calcium nitrite is divided into: Type 1 is anhydrous calcium nitrite; Type II is tetrahydrate calcium nitrite.
Industrial calcium nitrite shall meet the requirements of Table 1.
Table 1 Requirements
Calcium nitrite (Ca(NO3)) (calculated on dry basis) content ≥ [Ca(NO3)2 · 4H3O] content
Calcium nitrate [Ca(NO3)) (calculated on dry basis) content ≤ [Ca(N3)2 · 4H2(] content
Water insoluble matter content
National Petroleum and Chemical Industry Bureau 1999-04-20 Approved as first-class product
Qualified product
Qualified product
Implemented on 2000-04-01
4. Test method
HG/T 3595—1999
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, preparations and products used in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601 and GB/T603.
Safety Tips: Sulfuric acid is used as a corrosive in the test, so be careful when operating. 4.1 Determination of Calcium Nitrite Content
4.1.1 Summary of Method
In an acidic medium, use high Potassium manganate oxidizes calcium nitrite, and the calcium nitrite content is calculated based on the consumption of potassium permanganate standard titration solution.
4.1.2 Reagents and materials
4.1.2.1 Sulfuric acid solution: 1+5.
Heat the sulfuric acid solution to about 70°C, and add potassium permanganate standard titration solution until the solution turns slightly red. Cool and set aside. 4.1.2.2 Potassium permanganate standard titration solution: c(1/5KMnO4) is about 0.1 mol/I. 4.1.2.3 Sodium oxalate standard titration solution: c(1/2N azCzO4) is about 0.1mol/L. Weigh about 6.7g of sodium oxalate, dissolve it in 300mL (1+29) sulfuric acid solution (preparation method is the same as 4.1.2.1), dilute with water to 1000mL, and shake well. Calibrate with potassium permanganate standard titration solution. 4.1.3 Analysis steps
Weigh about 2.0g~3.5g of sample (accurate to 0.0002g), place it in a 500ml volumetric flask, add water to dissolve it, dilute with water to the scale, and shake well. In a 250mL conical flask, use a burette to add about 40 mI. Potassium permanganate standard titration solution. Use a pipette to transfer 25 ml of the test solution, add 10 ml of sulfuric acid solution (4.1.2.1), and heat to about 40°C. Use a pipette to add 10 mL of sodium oxalate standard titration solution, heat to 70°C~80°C, and continue to titrate with potassium permanganate standard titration solution until the solution turns pink and remains pink for 30 seconds.
4.1.4 Expression of analytical results
Calcium nitrite [Ca(NO,) content (X,) expressed as mass fraction is calculated according to formula (1): Xx (cV/-100)×0.03 02×100
25 (1)
m×5000
The content of calcium nitrite tetrahydrate [Ca(NO,)2·4H.O] expressed as mass fraction (X,) is calculated according to formula (2): x(V—10) 0.051 04×100
m×250
Wherein:
0. 051 04 -
The actual concentration of potassium permanganate standard titration solution, mol/L; -The volume of potassium permanganate standard titration solution added and consumed in the titration test solution, mL; The actual concentration of sodium oxalate standard titration solution, mol/L; -The percentage of water determined according to 4.3;
The mass of the test sample, g;
(2)
The mass of calcium nitrite in grams equivalent to 1.00mL potassium permanganate standard titration solution [c(KMnOa)=0.1000mol/L;
The mass of calcium nitrite in grams equivalent to 1.00mL potassium permanganate standard titration solution [c(- calcium nitrite tetrahydrate.
4.1.5 Allowable difference
KMnO)=0.1000mol/LJ. 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 0.2%. 1130
4.2 Determination of calcium nitrate content
4.2.1 Summary of method
HG/T 3595—1999
Add methanol to the test solution, and generate methyl nitrite with nitrite under the action of sulfuric acid. Remove it by evaporation. Add excess ammonium ferrous sulfate to reduce calcium nitrate, and back titrate with potassium permanganate standard titration solution. 4.2.2 Reagents and materials
4.2.2.1 Sodium sulfate.
4.2.2.2 Methanol.
4.2.2.3 Sulfuric acid.
4.2.2.4 Sulfuric acid solution: 1+5.
4.2.2.5 Sodium hydroxide solution: 200g/I. 4.2.2.6 Sodium hydroxide solution: 1g/1.
4.2.2.7 Phenolphthalein indicator solution: 10g/1.
4.2.2.8 Ammonium ferrous sulfate [Fe(NH4)2(SO4)2·6H2O]: c[Fe(NH4)2（SO),] about 0.2mol/L solution. Weigh 80g ammonium ferrous sulfate, dissolve in 300mL (1+8) sulfuric acid solution, add 700mL water, and shake well. 4.2.2.9 Potassium permanganate standard titration solution: c (=KMnO,) about 0.1 mol/L.
4.2.3 Analysis steps
Weigh about 5g sample (accurate to 0.0002g), place in a 300mL beaker, add 100mL water to dissolve, add about 7.5g sodium sulfate, stir evenly. Transfer all the test solution and precipitate into a 250ml volumetric flask, dilute with water to the mark, and shake well. Filter, use a pipette to transfer 25mL of the filtrate into a 500mL conical flask, add 10mL of methanol, and add 15mL of sulfuric acid solution (4.2.2.4) dropwise while stirring continuously. Control the speed of adding sulfuric acid to prevent the generation of methyl nitrite from being too intense. Wash the inner wall of the conical flask with water and heat to a slight boil for 2min. After cooling, add 2 drops of phenolic acid indicator solution, and neutralize with sodium hydroxide solution (4.2.2.5) until it turns pink [neutralize with sodium hydroxide solution (4.2.2.6) when it is close to the end point]. Evaporate the solution to 10mL~15mL at a slight boil, cool, and wash the inner wall of the flask with a small amount of water. Use a pipette to add 25ml of ammonium ferrous sulfate solution, and slowly add 25mL of sulfuric acid (4.2.2.3) along the wall of the flask while shaking continuously. Heat and boil slightly until the solution changes from brown to bright yellow. Remove the conical flask and quickly cool to room temperature. Add 250mL~300mL of water and titrate with potassium permanganate standard titration solution until the solution turns slightly red and remains so for 30 seconds. Perform a blank test at the same time.
4.2.4 Expression of analytical results
Calcium nitrate [Ca(NO:）,] content (X.) expressed as mass fraction is calculated according to formula (3): Xz = (V。- V)c× 0. 027 30
25 (1-)
m×%(1-100)
Calcium nitrate tetrahydrate [Ca(NO)2·4H,O] content (X,) expressed as mass fraction is calculated according to formula (4): Xe = (Vo-Vi)cX0. 044 12
m×500
The actual concentration of potassium permanganate standard titration solution, mol/L; Where: c——
V.—The volume of potassium permanganate standard titration solution consumed by the blank test solution, mL; V.—--The volume of potassium permanganate standard titration solution consumed by the test solution, mL; m—The mass of the sample, g;
X.—The percentage of water content determined according to 4.3; · (3)
· (4)
0.02730--The mass of calcium nitrate expressed in grams equivalent to 1.00mL of potassium permanganate standard titration solution [c(KMnO)) = 0.1000mol/L];
HG/T3595-1999
The mass of calcium nitrate tetrahydrate expressed in grams equivalent to 1.00mL of potassium permanganate standard titration solution [c(-KMnO4) = 0.1000mol/L].
4.2.5 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 0.05%. 4.3 Determination of moisture
4.3.1 Instruments and equipment
4.3.1.1 Weighing bottle: Φ40mm×25mm; 4.3.1.2 Electric oven: temperature can be controlled at 105℃~110℃. 4.3.2 Analysis steps
Weigh about 5g of sample (accurate to 0.0002g), place it in a weighing bottle that has been dried to constant weight at 105℃~110℃, and place it in an electric oven at 105℃~110℃ to dry to constant weight. 4.3.3 Expression of analysis results
The moisture expressed as mass fraction (X:) is calculated according to formula (5): ml = m22 × 100
Where: ml is the mass of the weighing bottle and the sample before drying, g; m2... is the mass of the weighing bottle and the sample after drying, g; m-
is the mass of the sample, g.
4.3.4 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the measurement result. The absolute difference of the parallel determination results shall not exceed 0.05%. 4.4 Determination of water-insoluble matter
4.4.1 Reagents and materials
4.4.1.1 Hydrochloric acid;
4.4.1.2 Starch-potassium iodide test paper.
4.4.2 Instruments and equipment
4.4.2.1 Glass sand crucible: The pore size of the filter plate is 5μm~~15μm4.4.2.2 Electric oven: The temperature can be controlled at 105℃~110℃. 4.4.3 Analysis steps
(5)
Weigh 25g of sample (accurate to 0.01g), place in a beaker, add 250mL of water to dissolve the sample, filter with constant weight glass sand, wash with warm water until there is no nitrite (take about 20mL of filtrate, add 2 drops of hydrochloric acid, and check with starch-potassium iodide test paper). Place the glass sand scale and the filter residue in an electric oven at 105℃~110℃ to dry until constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X) expressed as mass fraction is calculated according to formula (6): m -m2 ×100
Where: ml—mass of glass sand and residue, gm2—mass of glass sand crucible, g;
m——mass of sample, g.
4.4.5 Tolerance
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.03%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 1132
5.2 Each batch of products shall not exceed 50t.
HG/T3595-1999
5.3 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678-1986. When sampling, pass the sampler through 3/4 of the material layer from the mouth of the packaging container. After mixing the collected samples, reduce them to no less than 500g according to the quartering method, and pack them into two clean and dry wide-mouth bottles with stoppers and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for reference.
5.4 Industrial calcium nitrite should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial calcium nitrite shipped from the factory meets the requirements of this standard. 5.5 If one of the indicators does not meet the requirements of this standard, the sample shall be re-sampled from the packaging of twice the number of sampling units for re-testing. If even one of the indicators does not meet the requirements of this standard, the entire batch of products shall be unqualified. 5.6 The rounded value comparison method specified in 5.2 of GB/T1250-1989 shall be used to determine whether the test results meet the standard. 6 Markings and labels
6.1 The packaging bag of industrial calcium nitrite shall have firm and clear markings, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality meets this standard and the number of this standard. And the "oxidant" mark specified in GB190, and the "heat-averse" and "humidity-averse" marks specified in GB 191. 6.2 Each batch of industrial calcium nitrite shall be accompanied by a quality certificate, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality complies with this standard and the number of this standard. 7 Packaging, transportation and storage
7.1 Industrial calcium nitrite is packed in plastic woven bags, the inner packaging is polyethylene plastic film bags, and the outer packaging is plastic woven bags. The net content of each bag is 25kg. If special packaging is required, the supply and demand parties shall agree. 7.2 The inner bag of industrial calcium nitrite is tied twice with nylon rope, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl nylon thread or other threads of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches are neat, the needle length is evenly hooked, and there is no leakage or skipping.
7.3 Industrial calcium nitrite is strictly prohibited from being transported together with other items such as strong reducing agents during transportation. Prevent sun exposure and rain. 7.4 Industrial calcium nitrite should be stored in a cool, dry place.027 30
25 (1-)
m×%(1-100)
The content of calcium nitrate tetrahydrate [Ca(NO)2·4H,O] expressed as mass fraction (X,) is calculated according to formula (4): Xe = (Vo-Vi)cX0. 044 12
m×500
The actual concentration of potassium permanganate standard titration solution, mol/L; where: c——
V.—The volume of potassium permanganate standard titration solution consumed by the blank test solution, mL; V.—--The volume of potassium permanganate standard titration solution consumed by the test solution, mL; m—The mass of the sample, g;
X.——The percentage of water determined according to 4.3; · (3)
· (4)
0.02730--The mass of calcium nitrate expressed in grams equivalent to 1.00mL of potassium permanganate standard titration solution [c(KMnO)) = 0.1000mol/L];
HG/T3595-1999
The mass of calcium nitrate tetrahydrate expressed in grams equivalent to 1.00mL of potassium permanganate standard titration solution [c(-KMnO4) = 0.1000mol/L].
4.2.5 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 0.05%. 4.3 Determination of moisture
4.3.1 Instruments and equipment
4.3.1.1 Weighing bottle: Φ40mm×25mm; 4.3.1.2 Electric oven: temperature can be controlled at 105℃~110℃. 4.3.2 Analysis steps
Weigh about 5g of sample (accurate to 0.0002g), place it in a weighing bottle that has been dried to constant weight at 105℃~110℃, and place it in an electric oven at 105℃~110℃ to dry to constant weight. 4.3.3 Expression of analysis results
The moisture expressed as mass fraction (X:) is calculated according to formula (5): ml = m22 × 100
Where: ml is the mass of the weighing bottle and the sample before drying, g; m2... is the mass of the weighing bottle and the sample after drying, g; m-
is the mass of the sample, g.
4.3.4 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the measurement result. The absolute difference of the parallel determination results shall not exceed 0.05%. 4.4 Determination of water-insoluble matter
4.4.1 Reagents and materials
4.4.1.1 Hydrochloric acid;
4.4.1.2 Starch-potassium iodide test paper.
4.4.2 Instruments and equipment
4.4.2.1 Glass sand crucible: The pore size of the filter plate is 5μm~~15μm4.4.2.2 Electric oven: The temperature can be controlled at 105℃~110℃. 4.4.3 Analysis steps
(5)
Weigh 25g of sample (accurate to 0.01g), place in a beaker, add 250mL of water to dissolve the sample, filter with constant weight glass sand, wash with warm water until there is no nitrite (take about 20mL of filtrate, add 2 drops of hydrochloric acid, and check with starch-potassium iodide test paper). Place the glass sand scale and the filter residue in an electric oven at 105℃~110℃ to dry until constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X) expressed as mass fraction is calculated according to formula (6): m -m2 ×100
Where: ml—mass of glass sand and residue, gm2—mass of glass sand crucible, g;
m——mass of sample, g.
4.4.5 Tolerance
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.03%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 1132
5.2 Each batch of products shall not exceed 50t.
HG/T3595-1999
5.3 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678-1986. When sampling, pass the sampler through 3/4 of the material layer from the mouth of the packaging container. After mixing the collected samples, reduce them to no less than 500g according to the quartering method, and pack them into two clean and dry wide-mouth bottles with stoppers and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for reference.
5.4 Industrial calcium nitrite should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial calcium nitrite shipped from the factory meets the requirements of this standard. 5.5 If one of the indicators does not meet the requirements of this standard, the sample shall be re-sampled from the packaging of twice the number of sampling units for re-testing. If even one of the indicators does not meet the requirements of this standard, the entire batch of products shall be unqualified. 5.6 The rounded value comparison method specified in 5.2 of GB/T1250-1989 shall be used to determine whether the test results meet the standard. 6 Markings and labels
6.1 The packaging bag of industrial calcium nitrite shall have firm and clear markings, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality meets this standard and the number of this standard. And the "oxidant" mark specified in GB190, and the "heat-averse" and "humidity-averse" marks specified in GB 191. 6.2 Each batch of industrial calcium nitrite shall be accompanied by a quality certificate, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality complies with this standard and the number of this standard. 7 Packaging, transportation and storage
7.1 Industrial calcium nitrite is packed in plastic woven bags, the inner packaging is polyethylene plastic film bags, and the outer packaging is plastic woven bags. The net content of each bag is 25kg. If special packaging is required, the supply and demand parties shall agree. 7.2 The inner bag of industrial calcium nitrite is tied twice with nylon rope, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl nylon thread or other threads of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches are neat, the needle length is evenly hooked, and there is no leakage or skipping.
7.3 Industrial calcium nitrite is strictly prohibited from being transported together with other items such as strong reducing agents during transportation. Prevent sun exposure and rain. 7.4 Industrial calcium nitrite should be stored in a cool, dry place.027 30
25 (1-)
m×%(1-100)
The content of calcium nitrate tetrahydrate [Ca(NO)2·4H,O] expressed as mass fraction (X,) is calculated according to formula (4): Xe = (Vo-Vi)cX0. 044 12
m×500
The actual concentration of potassium permanganate standard titration solution, mol/L; where: c——
V.—The volume of potassium permanganate standard titration solution consumed by the blank test solution, mL; V.—--The volume of potassium permanganate standard titration solution consumed by the test solution, mL; m—The mass of the sample, g;
X.——The percentage of water determined according to 4.3; · (3)
· (4) www.bzxz.net
0.02730--The mass of calcium nitrate expressed in grams equivalent to 1.00mL of potassium permanganate standard titration solution [c(KMnO)) = 0.1000mol/L];
HG/T3595-1999
The mass of calcium nitrate tetrahydrate expressed in grams equivalent to 1.00mL of potassium permanganate standard titration solution [c(-KMnO4) = 0.1000mol/L].
4.2.5 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 0.05%. 4.3 Determination of moisture
4.3.1 Instruments and equipment
4.3.1.1 Weighing bottle: Φ40mm×25mm; 4.3.1.2 Electric oven: temperature can be controlled at 105℃~110℃. 4.3.2 Analysis steps
Weigh about 5g of sample (accurate to 0.0002g), place it in a weighing bottle that has been dried to constant weight at 105℃~110℃, and place it in an electric oven at 105℃~110℃ to dry to constant weight. 4.3.3 Expression of analysis results
The moisture expressed as mass fraction (X:) is calculated according to formula (5): ml = m22 × 100
Where: ml is the mass of the weighing bottle and the sample before drying, g; m2... is the mass of the weighing bottle and the sample after drying, g; m-
is the mass of the sample, g.
4.3.4 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the measurement result. The absolute difference of the parallel determination results shall not exceed 0.05%. 4.4 Determination of water-insoluble matter
4.4.1 Reagents and materials
4.4.1.1 Hydrochloric acid;
4.4.1.2 Starch-potassium iodide test paper.
4.4.2 Instruments and equipment
4.4.2.1 Glass sand crucible: The pore size of the filter plate is 5μm~~15μm4.4.2.2 Electric oven: The temperature can be controlled at 105℃~110℃. 4.4.3 Analysis steps
(5)
Weigh 25g of sample (accurate to 0.01g), place in a beaker, add 250mL of water to dissolve the sample, filter with constant weight glass sand, wash with warm water until there is no nitrite (take about 20mL of filtrate, add 2 drops of hydrochloric acid, and check with starch-potassium iodide test paper). Place the glass sand scale and the filter residue in an electric oven at 105℃~110℃ to dry until constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X) expressed as mass fraction is calculated according to formula (6): m -m2 ×100
Where: ml—mass of glass sand and residue, gm2—mass of glass sand crucible, g;
m——mass of sample, g.
4.4.5 Tolerance
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.03%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 1132
5.2 Each batch of products shall not exceed 50t.
HG/T3595-1999
5.3 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678-1986. When sampling, pass the sampler through 3/4 of the material layer from the mouth of the packaging container. After mixing the collected samples, reduce them to no less than 500g according to the quartering method, and pack them into two clean and dry wide-mouth bottles with stoppers and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for reference.
5.4 Industrial calcium nitrite should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial calcium nitrite shipped from the factory meets the requirements of this standard. 5.5 If one of the indicators does not meet the requirements of this standard, the sample shall be re-sampled from the packaging of twice the number of sampling units for re-testing. If even one of the indicators does not meet the requirements of this standard, the entire batch of products shall be unqualified. 5.6 The rounded value comparison method specified in 5.2 of GB/T1250-1989 shall be used to determine whether the test results meet the standard. 6 Markings and labels
6.1 The packaging bag of industrial calcium nitrite shall have firm and clear markings, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality meets this standard and the number of this standard. And the "oxidant" mark specified in GB190, and the "heat-averse" and "humidity-averse" marks specified in GB 191. 6.2 Each batch of industrial calcium nitrite shall be accompanied by a quality certificate, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality complies with this standard and the number of this standard. 7 Packaging, transportation and storage
7.1 Industrial calcium nitrite is packed in plastic woven bags, the inner packaging is polyethylene plastic film bags, and the outer packaging is plastic woven bags. The net content of each bag is 25kg. If special packaging is required, the supply and demand parties shall agree. 7.2 The inner bag of industrial calcium nitrite is tied twice with nylon rope, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl nylon thread or other threads of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches are neat, the needle length is evenly hooked, and there is no leakage or skipping.
7.3 Industrial calcium nitrite is strictly prohibited from being transported together with other items such as strong reducing agents during transportation. Prevent sun exposure and rain. 7.4 Industrial calcium nitrite should be stored in a cool, dry place.1 Hydrochloric acid;
4.4.1.2 Starch-potassium iodide test paper.
4.4.2 Instruments and equipment
4.4.2.1 Glass sand crucible: filter plate pore size is 5μm~~15μm4.4.2.2 Electric oven: temperature can be controlled at 105℃~110℃. 4.4.3 Analysis steps
(5)
Weigh 25g sample (accurate to 0.01g), place it in a beaker, add 250mL water to dissolve the sample, filter it with constant weight glass sand, and wash it with warm water until there is no nitrite (take about 20mL of filtrate, add 2 drops of hydrochloric acid, and check with starch-potassium iodide test paper). Place the glass sand scale and the filter residue in a 105℃~110℃ electric oven to dry until constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X) expressed as mass fraction is calculated according to formula (6): m -m2 ×100
Wherein: ml—mass of glass sand and residue, gm2—mass of glass sand crucible, g;
m——mass of sample, g.
4.4.5 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 0.03%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 1132
5.2 Each batch of products shall not exceed 50t.
HG/T3595-1999
5.3 Determine the number of sampling units according to 6.6 of GB/T6678-1986. When sampling, pass the sampler through 3/4 of the material layer from the mouth of the packaging container to take a sample. After mixing the sample, divide it into four parts to no less than 500g, and pack it into two clean and dry wide-mouth bottles with stoppers and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for reference.
5.4 Industrial calcium nitrite should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer should ensure that all industrial calcium nitrite shipped from the factory meets the requirements of this standard. 5.5 If one of the indicators in the test results does not meet the requirements of this standard, re-sample from the packaging of twice the number of sampling units should be re-tested. If even one of the indicators in the re-test results does not meet the requirements of this standard, the entire batch of products will be unqualified. 5.6 The rounded value comparison method specified in 5.2 of GB/T1250-1989 is used to determine whether the test results meet the standards. 6 Marking and labeling
6.1 The packaging bag of industrial calcium nitrite should have firm and clear markings, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality complies with this standard and the number of this standard. And the "oxidant" mark specified in GB190, and the "heat-afraid" and "moisture-afraid" marks specified in GB 191. 6.2 Each batch of industrial calcium nitrite products shipped out of the factory should be accompanied by a quality certificate, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality complies with this standard and the number of this standard. 7 Packaging, transportation, storage
7.1 Industrial calcium nitrite is packaged in plastic woven bags, with polyethylene plastic film bags as the inner packaging and plastic woven bags as the outer packaging. The net content of each bag is 25kg. If special packaging is required, the supply and demand parties shall agree. 7.2 The inner bag of industrial calcium nitrite shall be tied twice with nylon rope, or sealed with other equivalent methods; the outer bag shall be folded at a distance of not less than 30mm from the bag edge, and sewed with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches shall be neat, the needle length shall be even, and there shall be no leakage or skipping.
7.3 It is strictly forbidden to mix industrial calcium nitrite with other items such as strong reducing agents during transportation. Avoid exposure to sunlight and rain. 7.4 Industrial calcium nitrite should be stored in a cool and dry place. 11331 Hydrochloric acid;
4.4.1.2 Starch-potassium iodide test paper.
4.4.2 Instruments and equipment
4.4.2.1 Glass sand crucible: filter plate pore size is 5μm~~15μm4.4.2.2 Electric oven: temperature can be controlled at 105℃~110℃. 4.4.3 Analysis steps
(5)
Weigh 25g sample (accurate to 0.01g), place it in a beaker, add 250mL water to dissolve the sample, filter it with constant weight glass sand, and wash it with warm water until there is no nitrite (take about 20mL of filtrate, add 2 drops of hydrochloric acid, and check with starch-potassium iodide test paper). Place the glass sand scale and the filter residue in a 105℃~110℃ electric oven to dry until constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X) expressed as mass fraction is calculated according to formula (6): m -m2 ×100
Wherein: ml—mass of glass sand and residue, gm2—mass of glass sand crucible, g;
m——mass of sample, g.
4.4.5 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 0.03%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 1132
5.2 Each batch of products shall not exceed 50t.
HG/T3595-1999
5.3 Determine the number of sampling units according to 6.6 of GB/T6678-1986. When sampling, pass the sampler through 3/4 of the material layer from the mouth of the packaging container to take a sample. After mixing the sample, divide it into four parts to no less than 500g, and pack it into two clean and dry wide-mouth bottles with stoppers and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for reference.
5.4 Industrial calcium nitrite should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer should ensure that all industrial calcium nitrite shipped from the factory meets the requirements of this standard. 5.5 If one of the indicators in the test results does not meet the requirements of this standard, re-sample from the packaging of twice the number of sampling units should be re-tested. If even one of the indicators in the re-test results does not meet the requirements of this standard, the entire batch of products will be unqualified. 5.6 The rounded value comparison method specified in 5.2 of GB/T1250-1989 is used to determine whether the test results meet the standards. 6 Marking and labeling
6.1 The packaging bag of industrial calcium nitrite should have firm and clear markings, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality complies with this standard and the number of this standard. And the "oxidant" mark specified in GB190, and the "heat-afraid" and "moisture-afraid" marks specified in GB 191. 6.2 Each batch of industrial calcium nitrite products shipped out of the factory should be accompanied by a quality certificate, including: manufacturer name, address, product name, trademark, model, grade, net content, batch number or production date, proof that the product quality complies with this standard and the number of this standard. 7 Packaging, transportation, storage
7.1 Industrial calcium nitrite is packaged in plastic woven bags, with polyethylene plastic film bags as the inner packaging and plastic woven bags as the outer packaging. The net content of each bag is 25kg. If special packaging is required, the supply and demand parties shall agree. 7.2 The inner bag of industrial calcium nitrite shall be tied twice with nylon rope, or sealed with other equivalent methods; the outer bag shall be folded at a distance of not less than 30mm from the bag edge, and sewed with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches shall be neat, the needle length shall be even, and there shall be no leakage or skipping.
7.3 It is strictly forbidden to mix industrial calcium nitrite with other items such as strong reducing agents during transportation. Avoid exposure to sunlight and rain. 7.4 Industrial calcium nitrite should be stored in a cool and dry place. 1133
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