Some standard content:
HG/T 2828—1997
This standard is equivalent to the Japanese Industrial Standard JISK1440:1956 (confirmed in 1988) "Potassium Bicarbonate" standard, which has reached the international advanced level. The main technical differences between this standard and the Japanese Industrial Standard are as follows: 1 The technical indicators of the Japanese Industrial Standard only have one level, and this standard has three levels of superior products, first-class products, and qualified products according to my country's national conditions.
2 The Japanese Industrial Standard has six indicators of potassium bicarbonate, water-insoluble matter, potassium chloride, potassium sulfate, oxides, and potassium. This standard has added a pH value indicator based on the actual situation of potassium bicarbonate products in my country. 3 The potassium bicarbonate content of the Japanese Industrial Standard is 99%~102%. Since this standard stipulates the pH value indicator, there is no upper limit for the main content, which is set to not less than 99.0%.
Except for the pH value, the other indicators of the superior products of this standard are consistent with the Japanese Industrial Standard. 4 The test methods of this standard for potassium bicarbonate, chloride, iron oxide and potassium all adopt international general methods, and water-insoluble matter and sulfate are consistent with Japanese industrial standards.
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 Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Chengdu Chemical Co., Ltd., Changshu Chemical Plant, Shanxi Potash Plant, Hebei Tiaoshan Chemical Plant, and Shandong Lunan Fertilizer Plant. The main drafters of this standard are: Hou Jian, Gui Xianghong, Liang Yongxiang, Wu Muzhi, Liu Hongshan, and Shi Jie. This standard is entrusted to the technical unit responsible for the standardization of inorganic salt products of the Ministry of Chemical Industry for interpretation. 706
Chemical Industry Standard of the People's Republic of China
Potassium bicarbonate
Industry
Potassium bicarbonate for industrial useHG/T 2828-—1997
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of industrial potassium bicarbonate. This standard applies to potassium bicarbonate produced by electrolytic carbonization and ion exchange. The product is mainly used as a chemical raw material and can also be used in pharmaceuticals.
Molecular formula: KHCO3
Relative molecular mass: 100.12 (according to the 1993 international relative atomic mass) 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. GB 191--1990
Pictographic marking for packaging, storage and transportation
GB/T 601-1988
GB/T 602—1988
GB/T 603--1988
GB/T 1250--1989
GB/T 1587-1992
GB/T 6678 1986
GB/T 6682---1992
GB/T 8946--1988
3 Requirements
Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents Preparation of standard push solutions for determination of impurities of chemical reagents (neq1SO6353-1:1982) Preparation of preparations and products used in test methods for chemical reagents (neqISO6353-1:1982) Expression and determination methods of limit values Industrial potassium carbonate
General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (egvISO3696:1987) Plastic woven bags
3.1 Appearance: This product is white crystals.
3.2 Industrial potassium carbonate should meet the requirements of Table 1. Table 1 Requirements
Total alkali content (in KHCO,) (in dry basis)/%Water-insoluble matter content (in dry basis)/%
Chloride (in KCl) content (in dry basis)/%Sulfate (in K2S()) content (in dry basis)/%≤Iron oxide (Fe2,) content (in dry basis)/%Approved by the Ministry of Chemical Industry of the People's Republic of China on February 4, 1997Superior product
Qualified product
Implementation on October 1, 1997
Potassium (K) content (in dry basis)/%
pH value (100g/L. solution)
Note: The moisture index shall be resolved by negotiation between the supply and demand parties4 Sampling
4.1 Each batch of products shall not exceed 60t.
HG/T 2828—1997
Table 1 (end)
Superior products
Qualified products
4.2 Determine the number of sampling units according to the provisions of 6.6 of GB/T6678. Each bag is a packaging unit. When sampling, insert the sampler obliquely from the center of the packaging bag to 3/4 of the material layer for sampling. After mixing the collected samples, reduce them to about 500g according to the quartering method, and immediately put them into two clean and dry wide-mouth bottles with ground mouths and seal them. Labels are attached to 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 away from light for 1 month for reference. 4.3 If one of the test results does not meet the requirements of this standard, re-sample from twice the amount of packaging for verification. If even one of the verification results does not meet the requirements of this standard, the entire batch of products will be unqualified. 5 Test methods
5.1 All seven index items specified in this standard are type test items, among which potassium bicarbonate, chloride, sulfate, iron oxide and potassium are routine test items and should be tested batch by batch. Under normal production conditions, type tests should be carried out at least once every three months. 5.2 The rounded value comparison method specified in 5.2 of GB/T1250 shall be used to determine whether the test results meet the standards. 5.3 The reagents and water used in this standard, unless otherwise specified, refer to analytical 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, shall be prepared in accordance with the provisions of GB/T601, GB/T6.02 and GB/T603. 5.4 Determination of potassium bicarbonate content
5.4.1 Summary of the method
Potassium bicarbonate is alkaline in aqueous solution. Titrate the test solution with hydrochloric acid standard titration solution, and determine the content of potassium bicarbonate based on the consumption of hydrochloric acid standard titration solution.
5.4.2 Reagents and materials
5.4.2.1 Hydrochloric acid standard titration solution: c(HCI) is about 0.5mol/L; 5.4.2.2 Bromocresol green-methyl red indicator solution. 5.4.3 Analysis steps
Weigh about 1.5g of the sample (accurate to 0.0002g) that has been dried for 1h at 60℃±2℃ and vacuum degree 8.00×10*Pa-~9.33×104Pa. Place it in a 250ml beaker, dissolve it with 50ml of water, add 5 drops of bromocresol green-methyl red indicator solution, and titrate it with hydrochloric acid standard titration solution until the solution changes from green to dark red. Boil the solution for 2min, cool it down, and continue to titrate the dark red color. The end point is when it does not fade within 30s. Perform a blank test at the same time.
5.4.4 Expression of analytical results
The potassium bicarbonate (KHCO3) content X, expressed as mass percentage, is calculated according to the formula (1): X, =VV)c×0.102×100
= 10. 02(V-V.)c
Wherein: V-
the volume of the standard hydrochloric acid solution consumed in the titration of the test solution, mL; (1)
HG/T 2828--1997bzxz.net
V-the volume of the standard hydrochloric acid solution consumed in the titration of the blank solution, mL; the actual concentration of the standard hydrochloric acid solution, mol/L; ...the mass of the sample, g;
the mass of potassium bicarbonate in grams equivalent to 1.00 mL of the standard hydrochloric acid solution (CcHCl)=1.000 mol/L.
5.4.5 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 0.3%. 5.5 Determination of water-insoluble content
5.5.1 Summary of method
After the sample is dissolved in water, it is filtered, washed, dried and weighed. 5.5.2 Instruments and equipment
5.5.2.1 Glass sand crucible: filter plate pore size 5μm~15μm; 5.5.2.2 Electric oven: control the temperature at 105℃±5℃. 5.5.3 Analysis steps
Weigh 50.0g sample (accurate to 0.1g), place it in a 400mL beaker, add 300mL water and heat to dissolve, filter with a glass sand crucible that has been weighed in advance, and wash with hot water until the filtrate is neutral (check with pH test paper). Place the glass crucible in an oven at 105℃±5℃ and dry until constant weight.
5.5.4 Expression and calculation of analysis results
The water-insoluble content X expressed as a mass percentage is calculated according to formula (2): X
武: m-
mass of glass crucible, g;
m2mass of residue and glass crucible, g;
X,—-water content measured according to 5.11 of this standard, %; m
mass of sample, g.
5.5.5 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 0.002%. 5.6 Determination of chloride content
Determine according to 5.4 of GB/T1587.
5.6.1 Allowable difference
（2）
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of parallel determination results is not more than 0.003% for superior products, and not more than 0.02% for first-class products and qualified products. 5.7 Determination of sulfate content
Weigh about 5g of sample for superior products, and about 2g of sample for first-class products and qualified products (accurate to 0.01g), and determine according to 5.5 of GB/T1587.
5.8 Determination of iron content
Weigh about 2g of sample for superior products and first-class products, and about 1g of sample for qualified products (accurate to 0.01g), and determine according to 5.6 of GB/T1587.
5.8.1 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of parallel determination results is not more than 0.0005% for superior products and first-class products, and not more than 0.003% for qualified products. 5.9 Determination of potassium content (potassium tetraphenylborate gravimetric method) Weigh 1.2g to 1.25g of the sample dried for 1 hour at 60℃±2℃ and vacuum degree 8.00×10*Pa to 9.33×10*Pa (accurate to 0.0002g). The following determination is carried out according to 5.1.2.4 of GB/T1587. 5.9.1 Expression of analytical results
The potassium (K) content (X) expressed as a mass percentage is calculated according to formula (3): X; =m X0.279 4×100
m×500
Wu Zhong: m-
mass of potassium tetraphenylborate precipitate, g;
m-——·mass of the sample, g;
0.2794—coefficient for converting potassium tetraphenylborate into potassium bicarbonate. 5.9.2 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 0.3%. 5.10 Determination of pH value
5.10.1 Summary of method
The pH value of the test solution is determined using a glass electrode as the measuring electrode and a calomel electrode as the reference electrode. 5.10.2 Reagents and materials
Water without carbon dioxide.
5.10.3 Instruments and equipment
pH meter: the graduation value is 0.1pH unit. It is equipped with a saturated calomel electrode and a glass electrode. 5.10.4 Analysis steps
Connect the reference electrode and the measuring electrode to the acidometer, preheat, zero and position. ·(3)
Weigh 10g of the sample (accurate to 0.01g), place it in a 100ml beaker, dissolve it in water without carbon dioxide, transfer it to a 100mL volumetric flask, dilute to the scale, and shake it well. Pour it into a 100mL dry beaker and use a pH meter to determine the pH value of the test solution. 5.10.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.1IpH unit. 5.11 Determination of moisture content
5.11.1 Summary of the method
Dry the sample at 60℃±2℃ and vacuum degree 8.00×104Pa～9.33×104Pa for 1h, and determine the moisture content based on the weight loss before and after heating.
5.11.2 Instruments and equipment
Weighing bottle: $50mm×30mm.
5.11.3 Analysis steps
Weigh about 2g of sample (accurate to 0.0002g), place it in a weighing bottle with constant weight, move it into an electric vacuum drying oven, and heat it at 60℃±2℃ and vacuum degree 8.00×10*Pa～9.33×104Pa for 1h. Take it out and put it in a desiccator, cool it to room temperature, and weigh it. 5.11.4 Expression of analysis results
The moisture content (X,) expressed as mass percentage is calculated according to formula (4): X4 - m = m2 × 100
Wherein: m1—mass of weighing bottle and sample before heating, g; mass of weighing bottle and sample after heating·g; mz
—mass of sample, g.
5.11.5 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 0.02%. 710
6 Marking, packaging, transportation, storage
HG/T2828--1997
6.1 The packaging bags of industrial potassium bicarbonate should have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date and this standard number, as well as the "wet-afraid" mark specified in GB191. 6.2 Each batch of industrial potassium bicarbonate shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 6.3 Industrial potassium bicarbonate is double-layered. The inner packaging is a double-layer polyethylene plastic film bag with a thickness of not less than 0.08mm. The outer packaging is a plastic woven bag, and its performance and inspection methods should comply with the provisions of GB8946 Type A or Type B. The net weight of each bag is 25kg or 50kg.
6.4 For the packaging of industrial potassium bicarbonate, the film bag shall be tied twice with vinyl rope or rope of equivalent quality, 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 the opening shall be sewed with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length shall be 7mm to 12mm, the stitches shall be neat and evenly spaced. There shall be no leakage or skipping of stitches. 6.5 Industrial potassium bicarbonate shall be covered during transportation to prevent rain and moisture. 6.6 Industrial potassium bicarbonate shall be stored in a cool and dry place to prevent rain and moisture. 7112 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 0.3%. 5. 10 Determination of pH value
5.10.1 Summary of method
Use glass electrode as measuring electrode and calomel electrode as reference electrode to determine the pH value of the test solution. 5.10.2 Reagents and materials
Water without carbon dioxide.
5.10.3 Instruments and equipment
pH meter: the graduation value is 0.1pH unit. Equipped with saturated calomel electrode and glass electrode. 5.10.4 Analysis steps
Connect the reference electrode and measuring electrode to the acidometer, preheat, zero and position. · (3)
Weigh 10g of the sample (accurate to 0.01g), place it in a 100ml beaker, dissolve it in water without carbon dioxide, transfer it to a 100ml volumetric flask, dilute to the mark, and shake well. Pour it into a 100ml dry beaker and use a pH meter to determine the pH value of the test solution. 5.10.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the parallel determination results shall not exceed 0.1IpH unit. 5.11 Determination of moisture
5.11.1 Summary of method
Dry the sample at 60℃±2℃ and vacuum degree 8.00×104Pa～9.33×104Pa for 1h, and determine the moisture content based on the weight loss before and after heating.
5.11.2 Instruments and equipment
Weighing bottle: $50mm×30mm.
5.11.3 Analysis steps
Weigh about 2g of sample (accurate to 0.0002g), place it in a weighing bottle that has been constant weight, move it into an electric vacuum drying oven, and heat it for 1h at 60℃±2℃ and vacuum degree 8.00×10*Pa～9.33×104Pa. Take it out and place it in a desiccator, cool it to room temperature, and weigh it. 5.11.4 Expression of analysis results
The moisture content (X,) expressed as mass percentage is calculated according to formula (4): X4 - m=m2 ×100
Where: m1—mass of weighing bottle and sample before heating, g; mass of weighing bottle and sample after heating·g; mz
—mass of sample, g.
5.11.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02%. 710
6 Marking, packaging, transportation, storage
HG/T2828--1997
6.1 The packaging bag of industrial potassium bicarbonate shall have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date and this standard number, as well as the "wet-afraid" mark specified in GB191. 6.2 Each batch of industrial potassium bicarbonate shipped shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality complies with this standard and this standard number. 6.3 Industrial potassium bicarbonate is double-layer packaged. The inner packaging is a double-layer polyethylene plastic film bag with a thickness of not less than 0.08mm. The outer packaging is a plastic woven bag, and its performance and inspection methods shall comply with the provisions of GB8946 Type A or Type B. The net weight of each bag is 25kg or 50kg.
6.4 For the packaging of industrial potassium bicarbonate, the film bag is tied twice with vinyl rope or rope of equivalent quality, 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 opening is sewed 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 even. There is no leakage or skipping. 6.5 Industrial potassium bicarbonate should be covered during transportation to prevent rain and moisture. 6.6 Industrial potassium bicarbonate should be stored in a cool and dry place to prevent rain and moisture. 7112 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 0.3%. 5. 10 Determination of pH value
5.10.1 Summary of method
Use glass electrode as measuring electrode and calomel electrode as reference electrode to determine the pH value of the test solution. 5.10.2 Reagents and materials
Water without carbon dioxide.
5.10.3 Instruments and equipment
pH meter: the graduation value is 0.1pH unit. Equipped with saturated calomel electrode and glass electrode. 5.10.4 Analysis steps
Connect the reference electrode and measuring electrode to the acidity meter, preheat, zero and position. · (3)
Weigh 10g of the sample (accurate to 0.01g), place it in a 100ml beaker, dissolve it in water without carbon dioxide, transfer it to a 100ml volumetric flask, dilute to the mark, and shake well. Pour it into a 100ml dry beaker and use a pH meter to determine the pH value of the test solution. 5.10.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the parallel determination results shall not exceed 0.1IpH unit. 5.11 Determination of moisture
5.11.1 Summary of method
Dry the sample at 60℃±2℃ and vacuum degree 8.00×104Pa～9.33×104Pa for 1h, and determine the moisture content based on the weight loss before and after heating.
5.11.2 Instruments and equipment
Weighing bottle: $50mm×30mm.
5.11.3 Analysis steps
Weigh about 2g of sample (accurate to 0.0002g), place it in a weighing bottle that has been constant weight, move it into an electric vacuum drying oven, and heat it for 1h at 60℃±2℃ and vacuum degree 8.00×10*Pa～9.33×104Pa. Take it out and place it in a desiccator, cool it to room temperature, and weigh it. 5.11.4 Expression of analysis results
The moisture content (X,) expressed as mass percentage is calculated according to formula (4): X4 - m=m2 ×100
Where: m1—mass of weighing bottle and sample before heating, g; mass of weighing bottle and sample after heating·g; mz
—mass of sample, g.
5.11.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02%. 710
6 Marking, packaging, transportation, storage
HG/T2828--1997
6.1 The packaging bag of industrial potassium bicarbonate shall have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date and this standard number, as well as the "wet-afraid" mark specified in GB191. 6.2 Each batch of industrial potassium bicarbonate shipped shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality complies with this standard and this standard number. 6.3 Industrial potassium bicarbonate is double-layer packaged. The inner packaging is a double-layer polyethylene plastic film bag with a thickness of not less than 0.08mm. The outer packaging is a plastic woven bag, and its performance and inspection methods shall comply with the provisions of GB8946 Type A or Type B. The net weight of each bag is 25kg or 50kg.
6.4 For the packaging of industrial potassium bicarbonate, the film bag is tied twice with vinyl rope or rope of equivalent quality, 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 opening is sewed 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 even. There is no leakage or skipping. 6.5 Industrial potassium bicarbonate should be covered during transportation to prevent rain and moisture. 6.6 Industrial potassium bicarbonate should be stored in a cool and dry place to prevent rain and moisture. 711
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