HG/T 2966-1999 Industrial tripotassium hexacyanoferrate (potassium hexacyanoferrate)
Some standard content:
Record number: 27711999
HG/T2966—1999
This standard is a revision of the chemical industry standard HG/T2966--1987 "Industrial Potassium Ferrocyanide (Potassium Hemocyanide)". This standard is not equivalent to the American national standard ANSI PH4·302:1986 "Photographic Grade Potassium Ferrocyanide". The main differences between this standard and ANSI PH4·302:1986 are: 1. ANSI PH4·302:1986 products have only one level; this standard divides products into three levels: superior products, standard products and qualified products.
2 The control items of ANSI PH4·302:1986 are main content and water insoluble matter; the control items of this standard are main content, chloride, potassium ferrocyanide and water insoluble matter.
The main differences between this standard and the chemical industry standard HG/T2966-1987 are as follows: 1 The original industry standard HG/T2966-1987 has only one level; this standard divides the products into three levels. 2 The indicators of the original industry standard HG/T2966-1987 are indicators of qualified products; this standard adds indicators of superior products and first-class products on this basis, and the technical indicators are greatly improved. 3 The original industry standard HG/T2966-1987 uses potentiometric titration to measure chloride in the test method; this standard uses mercury titration to measure chloride.
From the date of entry into force of this standard, HG/T2966-1987 will be replaced at the same time. 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 Technical Unit for Standardization of Inorganic Salt Products of the Ministry of Chemical Industry. The drafting units of this standard are: Tianjin Chemical Research Institute of the Ministry of Chemical Industry, and Changchun Chemical Plant No. 5. The main drafters of this standard are: Zhang Jingjuan, Zhu Liwen, and Wang Chunnian. This standard was first issued as a national standard in May 1987, and was adjusted from a national standard to a recommended chemical industry standard in 1992. This standard is entrusted to the Technical Unit for Standardization of Inorganic Salt Products of the Ministry of Chemical Industry for interpretation. 919
1 Scope
Chemical Industry Standard of the People's Republic of China
Industrial tripotassium hexacyanoferrat (potassium hexacyanoferrat) Kaliumhexacyanoferrat (II) for industrial use HG/T 2966-1999
Replaces HG/T2966-1987
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of industrial tripotassium hexacyanoferrat (potassium hexacyanoferrat).
This standard applies to industrial tripotassium hexacyanoferrate, which is mainly used in the pharmaceutical, leather, printing and dyeing, electroplating and other industries. Molecular formula: K, Fe(CN)6
Relative molecular mass: 329.25 (according to the 1995 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 the parties using this standard should explore the possibility of using the latest version of the following standards. Packaging, storage and transportation pictorial marking
GB 191-19901
GB/T601-1988 Preparation of standard solutions for titration analysis (volume analysis) of chemical reagentsGB/T 602—1988
GB/T 603—1988
GB/T 1250—1989
GB/T3051
Preparation of standard solutions for determination of impurities in chemical reagents (neqISO6353-1:1982) Preparation of preparations and products used in test methods for chemical reagents (neqISO6353-1:1982) Methods for expressing and determining limit values1982(89)
GB/T 66781986
GB/T 6682—1992
GB/T 8946—1988
3 Requirements
General method for determination of chloride content in inorganic chemical products Mercury titration method (neqISO5790:1979) General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories Plastic woven bags
Appearance: dark red or golden red crystals or powder. 3.2 Industrial tripotassium hexacyanoferrate shall meet the requirements of Table 1. Table 1 Requirements
Indicator Item
Superior product
Tripotassium hexacyanoferrate EK.Fe(CN). ] Content Chloride (in KCI) Content
Hexacyanoferrate (II) [in K,Fe(CN). Calculated content Water insoluble content
4 Test method
-Qualified products
The reagents and water used in this standard, unless otherwise specified, refer to analytical reagents and grade 3 water specified in GB/T6682. Approved by the State Administration of Petroleum and Chemical Industry on April 20, 1999 920
2000-04-01 implementation
HG/T 2966—1999
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.
4.1 Determination of tripotassium hexacyanoferrate content
4.1.1 Summary of the method
In an acidic medium and in the presence of zinc sulfate, tripotassium hexacyanoferrate undergoes a redox reaction with potassium iodide, and the precipitated free iodine is titrated with a standard sodium thiosulfate titration solution.
4.1.2 Reagents and materials
4.1.2.1 Potassium iodide;
4.1.2.2 Glacial acetic acid;
4.1.2.3 Zinc sulfate solution: 290 g/L;
4.1.2.4 Standard sodium thiosulfate titration solution: c(NazS,O.)=0.1 mol/L;4.1.2.5 Starch indicator solution: 5 g/L.
4.1.3 Analysis steps
Weigh about 1.3g of sample (accurate to 0.0002g), place in a conical flask with a ground stopper, add 50mL of water to dissolve, add 3g of potassium iodide, 2mL of glacial acetic acid, 20ml of zinc sulfate solution, cover the bottle stopper, shake thoroughly, and immediately titrate with sodium thiosulfate standard titration solution. When it is close to the end point, add 2ml of starch indicator solution, and continue to titrate until the blue color of the solution just disappears, which is the end point. 4.1.4 Expression of analysis results
Tripotassium hexacyanoferrate [K.Fe(CN)] expressed as mass percentage. The content X is calculated according to formula (1): X = Vc × 0. 329 2 × 100 = 32. 92 × Vcm
wherein; V is the volume of sodium thiosulfate standard titration solution consumed in titration, mL; the actual concentration of sodium thiosulfate standard titration solution, mol/L; m-
0. 329 2-
the mass of the sample weighed,;
the mass of potassium hexacyanoferrate expressed in grams equivalent to 1.00mL of sodium thiosulfate standard titration solution c (NazSzO3) = 1.000mol/L].
4.1.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.2%. 4.2 Determination of chloride content
4.2.1 Method summary
Same as Chapter 2 of GB/T3051-1982.
4.2.2 Reagents and materials
4.2.2.1 95% ethanol;
4.2.2.2 Nitric acid solution: 1+15;
4.2.2.3 Zinc nitrate solution: 150g/L;
4.2.2.4 Mercuric nitrate standard titration solution: c『Hg(NO)2 about 0.05mol/L, prepared and calibrated according to 4.9 of GB/T3051--1982 (89);
4.2.2.5 Bromophenol blue indicator solution: 1g/L ethanol solution; 4.2.2.6 Diphenylazocarbonyl indicator solution: 5g/L ethanol solution. 4.2.3 Instruments and equipment
Same as Chapter 3 of GB/T3051--1982.
4.2.4 Analysis steps
Weigh about 5g of sample (accurate to 0.0002g), place in a 400mL beaker, add 100mL of water to dissolve, add 100mL of zinc nitrate solution, stir and transfer all into a 500mL volumetric flask, add water and dilute to the scale, shake well. Let stand and separate, filter slowly with filter paper, discard the initial filtrate, and transfer 100ml.The filtrate is placed in a 300mL conical flask, 3 drops of bromophenol blue indicator solution are added, and nitric acid solution is added until it just turns yellow, and then 5 drops are added in excess. 1mL of diphenylazocarbonylhydrazide indicator solution is added, and a microburette is used to titrate with a standard titration solution of mercuric nitrate until the solution changes from yellow to purple-red, which is the end point.
Blank test: 100mL of water and 3 drops of bromophenol blue indicator solution are added to a 250mL conical flask, and nitric acid solution is added until it just turns from blue to yellow, and then 5 drops are added in excess. 1mL of diphenylazocarbonylhydrazide indicator solution is added, and a microburette is used to titrate with a standard titration solution of mercuric nitrate until the solution changes from purple-red. Record the volume used. Save the waste liquid after titration and handle it according to the provisions of Appendix D of GB/T3051-1982. 4.2.5 Expression of analytical results
The chloride content (in KCi) expressed as mass percentage (X2) is calculated according to formula (2): X = (V-Vo)cX0. 074 55 × 100 = 37.28 × (V-Vo)c100
m×500
Wherein: V—the volume of the standard mercuric nitrate solution consumed by the titration test solution, mL; V. —the volume of the standard mercuric nitrate solution consumed by the titration blank test solution, mL; c—the actual concentration of the standard mercuric nitrate solution, mol/L; m—the mass of the sample, g;
......( 2)
0.07455——the mass of potassium chloride in grams equivalent to 1.00 mL of the standard mercuric nitrate solution (c[1/2Hg(NOs)2]=1.000mol/L).
4.2.6 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 0.03%. 4.3 Determination of hexacyanoferrate (II) content 4.3.1 Method summary
In an acidic medium, potassium permanganate is used to oxidize the hexacyanoferrate (II) in the sample to hexacyanoferrate (III). After the reaction is complete, the excess potassium permanganate makes the solution orange and indicates the end point. 4.3.2 Reagents and materials
4.3.2.1 Sulfuric acid solution: 1+4;
4.3.2.2 Potassium permanganate standard titration solution: c(1/5KMnO)-0.01mol/L. 4.3.3 Instruments and equipment
Microburette: The nominal graduation value is 0.01mL or 0.02mL. 4.3.4 Analysis steps
Weigh about 1.3g of sample (accurate to 0.0002g), place it in a 300mL conical flask, and add 80mL of water to dissolve it. Add 20mL of sulfuric acid solution, mix and shake, and titrate with potassium permanganate standard titration solution until the solution turns orange, which is the end point. Perform a blank test at the same time.
4.3.5 Expression of analysis results
The content of hexacyanoferrate (II) salt (calculated as K,Fe(CN)) expressed as mass percentage (X,) is calculated according to formula (3): X = VV.)e×0. 368 3 × 100 m 36. 83×(V-Vo)cm
Where: V——the volume of potassium permanganate standard titration solution consumed by the titration test solution, mL; V. —Volume of potassium permanganate standard titration solution consumed in titrating the blank test solution, mL; 922
HG/T 2966—1999
c--Actual concentration of potassium permanganate standard titration solution, mol/L; m——Weighed mass of the sample, g;bzxz.net
0.3683---Mass of potassium hexacyanoferrate (II) equivalent to 1.00ml. potassium permanganate standard titration solution [[c (No. KMnO.)] = 1.000mol/L) expressed in grams.
4.3.6 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%. 4.4 Determination of water-insoluble matter content
4.4.1 Reagents and materials
Ammonium ferric sulfate solution: 50g/I.
4.4.2 Instruments and equipment
Glass sand crucible: pore size 5μm～15μm.
4.4.3 Analysis steps
Weigh about 50g of sample (accurate to 0.1g), place it in a 500mL beaker, add about 100mL~150mL water, heat and stir until the sample is completely dissolved, filter it while hot with glass sand that has been dried to constant weight at 105℃～110℃, and wash it with hot water until no blue color appears when tested with ammonium ferric sulfate solution. Dry the residue at 105℃～110℃ to constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X4) expressed as mass percentage is calculated according to formula (4): X4= ma=m×100
Where: ml—mass of glass sand crucible, g; m2—mass of water-insoluble matter and glass sand crucible, g; m—mass of weighed sample, g.
4.4.5 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 0.005%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 5.2 Each batch of products shall not exceed 5t.
5.3 Determine the number of sampling units in accordance with 6.6 of GB/T6678-1986. Each plastic woven bag is a packaging unit. ·（4
When sampling, insert the sampler obliquely from the top of the packaging bag into the material layer at 3/4 of the depth to take a sample. After mixing the sample, divide it into about 500g according to the quartering method, and pack it into two clean and dry wide-mouth bottles with ground stoppers and seal them. Stick labels on the bottles, indicating the 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 is kept for three months for reference. 5.4 Industrial tripotassium hexacyanoferrate 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 each batch of products shipped from the factory meets the requirements of this standard. If one of the test results does not meet the requirements of this standard, re-sampling should be carried out from twice the number of sampling units of the batch of products for re-testing. If even one of the re-test results does not meet the requirements of this standard, the entire batch of products shall be deemed unqualified. 5.5 Determine whether the test results meet the standards by the rounded value comparison method specified in 5.2 of GB/T1250-1989. 923
6 Marking, packaging, transportation and storage
HG/T2966-1999
6.1 The packaging bags of tripotassium hexacyanoferrate should have a firm and clear label. The mark shall include the manufacturer’s name, address, product name, trademark, grade, net content, batch number or production date, this standard number and the “moisture-afraid” mark in GB191. 6.2 Each batch of industrial tripotassium hexacyanoferrate products shipped out of the factory shall be accompanied by a quality certificate, which shall include the manufacturer’s name, address, product name, grade, net content, batch number or production date and this standard number. 6.3 The inner packaging of industrial tripotassium hexacyanoferrate shall be a plastic film bag with a thickness of not less than 0.05mm, and the outer packaging shall be a plastic woven bag. Its performance and inspection methods shall comply with the relevant provisions of GB/T8946. Each The net content of the bag is 25kg or 50kg. 6.4 The packaging of industrial potassium hexacyanoferrate should be sealed or tied with a sealing machine. The outer bag should be folded at a distance of not less than 30mm from the bag edge, and the edge should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches should be neat, the needle length should be even, and there should be no leakage or skipping. 6.5. Industrial potassium hexacyanoferrate should be covered during transportation to prevent rain and moisture. It should not be mixed with acids. 6.6 Industrial potassium hexacyanoferrate should be stored in a ventilated and dry warehouse to prevent rain, moisture and sunlight exposure, and should not be mixed with acids.00mL of standard titration solution of mercuric nitrate (c[1/2Hg(NOs)2]=1.000mol/L) is equivalent to the mass of potassium chloride expressed in grams.
4.2.6 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 0.03%. 4.3 Determination of hexacyanoferrate (II) content 4.3.1 Summary of method
In an acidic medium, potassium permanganate is used to oxidize the hexacyanoferrate (II) in the sample to hexacyanoferrate (III). After the reaction is complete, the excess potassium permanganate makes the solution orange and indicates the end point. 4.3.2 Reagents and materials
4.3.2.1 Sulfuric acid solution: 1+4;
4.3.2.2 Potassium permanganate standard titration solution: c(1/5KMnO)-0.01mol/L. 4.3.3 Instruments and equipment
Microburette: nominal graduation value is 0.01mL or 0.02mL. 4.3.4 Analysis steps
Weigh about 1.3g of sample (accurate to 0.0002g), place it in a 300mL conical flask, add 80mL of water to dissolve. Add 20mL of sulfuric acid solution, mix and shake, and titrate with potassium permanganate standard titration solution until the solution turns orange, which is the end point. Perform a blank test at the same time.
4.3.5 Expression of analytical results
The content of hexacyanoferrate (II) (calculated as K,Fe(CN)) expressed as mass percentage (X,) is calculated according to formula (3): X = VV.)e×0.3683×100m36.83×(V-Vo)cm
Wherein: V——volume of standard potassium permanganate solution consumed in titration of test solution, mL; V. —Volume of potassium permanganate standard titration solution consumed in titrating the blank test solution, mL; 922
HG/T 2966—1999
c--Actual concentration of potassium permanganate standard titration solution, mol/L; m——Weighed mass of the sample, g;
0.3683---Mass of potassium hexacyanoferrate (II) equivalent to 1.00ml. potassium permanganate standard titration solution [[c (No. KMnO.)] = 1.000mol/L) expressed in grams.
4.3.6 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%. 4.4 Determination of water-insoluble matter content
4.4.1 Reagents and materials
Ammonium ferric sulfate solution: 50g/I.
4.4.2 Instruments and equipment
Glass sand crucible: pore size 5μm～15μm.
4.4.3 Analysis steps
Weigh about 50g of sample (accurate to 0.1g), place it in a 500mL beaker, add about 100mL~150mL water, heat and stir until the sample is completely dissolved, filter it while hot with glass sand that has been dried to constant weight at 105℃～110℃, and wash it with hot water until no blue color appears when tested with ammonium ferric sulfate solution. Dry the residue at 105℃～110℃ to constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X4) expressed as mass percentage is calculated according to formula (4): X4= ma=m×100
Where: ml—mass of glass sand crucible, g; m2—mass of water-insoluble matter and glass sand crucible, g; m—mass of weighed sample, g.
4.4.5 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 0.005%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 5.2 Each batch of products shall not exceed 5t.
5.3 Determine the number of sampling units in accordance with 6.6 of GB/T6678-1986. Each plastic woven bag is a packaging unit. ·（4
When sampling, insert the sampler obliquely from the top of the packaging bag into the material layer at 3/4 of the depth to take a sample. After mixing the sample, divide it into about 500g according to the quartering method, and pack it into two clean and dry wide-mouth bottles with ground stoppers and seal them. Stick labels on the bottles, indicating the 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 is kept for three months for reference. 5.4 Industrial tripotassium hexacyanoferrate 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 each batch of products shipped from the factory meets the requirements of this standard. If one of the test results does not meet the requirements of this standard, re-sampling should be carried out from twice the number of sampling units of the batch of products for re-testing. If even one of the re-test results does not meet the requirements of this standard, the entire batch of products shall be deemed unqualified. 5.5 Determine whether the test results meet the standards by the rounded value comparison method specified in 5.2 of GB/T1250-1989. 923
6 Marking, packaging, transportation and storage
HG/T2966-1999
6.1 The packaging bags of tripotassium hexacyanoferrate should have a firm and clear label. The mark shall include the manufacturer’s name, address, product name, trademark, grade, net content, batch number or production date, this standard number and the “moisture-afraid” mark in GB191. 6.2 Each batch of industrial tripotassium hexacyanoferrate products shipped out of the factory shall be accompanied by a quality certificate, which shall include the manufacturer’s name, address, product name, grade, net content, batch number or production date and this standard number. 6.3 The inner packaging of industrial tripotassium hexacyanoferrate shall be a plastic film bag with a thickness of not less than 0.05mm, and the outer packaging shall be a plastic woven bag. Its performance and inspection methods shall comply with the relevant provisions of GB/T8946. Each The net content of the bag is 25kg or 50kg. 6.4 The packaging of industrial potassium hexacyanoferrate should be sealed or tied with a sealing machine. The outer bag should be folded at a distance of not less than 30mm from the bag edge, and the edge should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches should be neat, the needle length should be even, and there should be no leakage or skipping. 6.5. Industrial potassium hexacyanoferrate should be covered during transportation to prevent rain and moisture. It should not be mixed with acids. 6.6 Industrial potassium hexacyanoferrate should be stored in a ventilated and dry warehouse to prevent rain, moisture and sunlight exposure, and should not be mixed with acids.00mL standard titration solution of mercuric nitrate (c[1/2Hg(NOs)2]=1.000mol/L) is equivalent to the mass of potassium chloride expressed in grams.
4.2.6 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 0.03%. 4.3 Determination of hexacyanoferrate (II) content 4.3.1 Summary of method
In an acidic medium, potassium permanganate is used to oxidize the hexacyanoferrate (II) in the sample to hexacyanoferrate (III). After the reaction is complete, the excess potassium permanganate makes the solution orange and indicates the end point. 4.3.2 Reagents and materials
4.3.2.1 Sulfuric acid solution: 1+4;
4.3.2.2 Potassium permanganate standard titration solution: c(1/5KMnO)-0.01mol/L. 4.3.3 Instruments and equipment
Microburette: nominal graduation value is 0.01mL or 0.02mL. 4.3.4 Analysis steps
Weigh about 1.3g of sample (accurate to 0.0002g), place it in a 300mL conical flask, add 80mL of water to dissolve. Add 20mL of sulfuric acid solution, mix and shake, and titrate with potassium permanganate standard titration solution until the solution turns orange, which is the end point. Perform a blank test at the same time.
4.3.5 Expression of analytical results
The content of hexacyanoferrate (II) (calculated as K,Fe(CN)) expressed as mass percentage (X,) is calculated according to formula (3): X = VV.)e×0.3683×100m36.83×(V-Vo)cm
Wherein: V——volume of standard potassium permanganate solution consumed in titration of test solution, mL; V. —Volume of potassium permanganate standard titration solution consumed in titrating the blank test solution, mL; 922
HG/T 2966—1999
c--Actual concentration of potassium permanganate standard titration solution, mol/L; m——Weighed mass of the sample, g;
0.3683---Mass of potassium hexacyanoferrate (II) equivalent to 1.00ml. potassium permanganate standard titration solution [[c (No. KMnO.)] = 1.000mol/L) expressed in grams.
4.3.6 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%. 4.4 Determination of water-insoluble matter content
4.4.1 Reagents and materials
Ammonium ferric sulfate solution: 50g/I.
4.4.2 Instruments and equipment
Glass sand crucible: pore size 5μm～15μm.
4.4.3 Analysis steps
Weigh about 50g of sample (accurate to 0.1g), place it in a 500mL beaker, add about 100mL~150mL water, heat and stir until the sample is completely dissolved, filter it while hot with glass sand that has been dried to constant weight at 105℃～110℃, and wash it with hot water until no blue color appears when tested with ammonium ferric sulfate solution. Dry the residue at 105℃～110℃ to constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X4) expressed as mass percentage is calculated according to formula (4): X4= ma=m×100
Where: ml—mass of glass sand crucible, g; m2—mass of water-insoluble matter and glass sand crucible, g; m—mass of weighed sample, g.
4.4.5 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 0.005%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 5.2 Each batch of products shall not exceed 5t.
5.3 Determine the number of sampling units in accordance with 6.6 of GB/T6678-1986. Each plastic woven bag is a packaging unit. ·（4
When sampling, insert the sampler obliquely from the top of the packaging bag into the material layer at 3/4 of the depth to take a sample. After mixing the sample, divide it into about 500g according to the quartering method, and pack it into two clean and dry wide-mouth bottles with ground stoppers and seal them. Stick labels on the bottles, indicating the 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 is kept for three months for reference. 5.4 Industrial tripotassium hexacyanoferrate 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 each batch of products shipped from the factory meets the requirements of this standard. If one of the test results does not meet the requirements of this standard, re-sampling should be carried out from twice the number of sampling units of the batch of products for re-testing. If even one of the re-test results does not meet the requirements of this standard, the entire batch of products shall be deemed unqualified. 5.5 Determine whether the test results meet the standards by the rounded value comparison method specified in 5.2 of GB/T1250-1989. 923
6 Marking, packaging, transportation and storage
HG/T2966-1999
6.1 The packaging bags of tripotassium hexacyanoferrate should have a firm and clear label. The mark shall include the manufacturer’s name, address, product name, trademark, grade, net content, batch number or production date, the number of this standard and the “moisture-afraid” mark in GB191. 6.2 Each batch of industrial tripotassium hexacyanoferrate products shipped out of the factory shall be accompanied by a quality certificate, which shall include the manufacturer’s name, address, product name, grade, net content, batch number or production date and the number of this standard. 6.3 The inner packaging of industrial tripotassium hexacyanoferrate shall be a plastic film bag with a thickness of not less than 0.05mm, and the outer packaging shall be a plastic woven bag. Its performance and inspection methods shall comply with the relevant provisions of GB/T8946. Each The net content of the bag is 25kg or 50kg. 6.4 For industrial tripotassium hexacyanoferrate packaging, the inner bag is sealed or tied with a sealing machine, and the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches are neat, the needle length is even, and there is no leakage or skipping. 6.5. During transportation, industrial tripotassium hexacyanoferrate should be covered to prevent rain and moisture. It should not be mixed with acidic items. 6.6 Industrial tripotassium hexacyanoferrate should be stored in a ventilated and dry warehouse to prevent rain, moisture and sunlight exposure, and should not be mixed with acidic items.2 Instruments and equipment
Glass sand crucible: pore size 5μm~15μm.
4.4.3 Analysis steps
Weigh about 50g of sample (accurate to 0.1g), place it in a 500mL beaker, add about 100mL~150mL water, heat and stir until the sample is completely dissolved, filter it while hot with glass sand that has been dried to constant weight at 105℃~110℃, and wash it with hot water until no blue color appears when tested with ammonium ferric sulfate solution. Dry the residue at 105℃~110℃ to constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X4) expressed as mass percentage is calculated according to formula (4): X4= ma=m×100
Where: ml—mass of glass sand crucible, g; m2—mass of water-insoluble matter and glass sand crucible, g; m—mass of weighed sample, g.
4.4.5 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 0.005%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 5.2 Each batch of products shall not exceed 5t.
5.3 Determine the number of sampling units in accordance with 6.6 of GB/T6678-1986. Each plastic woven bag is a packaging unit. ·（4
When sampling, insert the sampler obliquely from the top of the packaging bag into the material layer at 3/4 of the depth to take a sample. After mixing the sample, divide it into about 500g according to the quartering method, and pack it into two clean and dry wide-mouth bottles with ground stoppers and seal them. Stick labels on the bottles, indicating the 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 is kept for three months for reference. 5.4 Industrial tripotassium hexacyanoferrate 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 each batch of products shipped from the factory meets the requirements of this standard. If one of the test results does not meet the requirements of this standard, re-sampling should be carried out from twice the number of sampling units of the batch of products for re-testing. If even one of the re-test results does not meet the requirements of this standard, the entire batch of products shall be deemed unqualified. 5.5 Determine whether the test results meet the standards by the rounded value comparison method specified in 5.2 of GB/T1250-1989. 923
6 Marking, packaging, transportation and storage
HG/T2966-1999
6.1 The packaging bags of tripotassium hexacyanoferrate should have a firm and clear label. The mark shall include the manufacturer’s name, address, product name, trademark, grade, net content, batch number or production date, the number of this standard and the “moisture-afraid” mark in GB191. 6.2 Each batch of industrial tripotassium hexacyanoferrate products shipped out of the factory shall be accompanied by a quality certificate, which shall include the manufacturer’s name, address, product name, grade, net content, batch number or production date and the number of this standard. 6.3 The inner packaging of industrial tripotassium hexacyanoferrate shall be a plastic film bag with a thickness of not less than 0.05mm, and the outer packaging shall be a plastic woven bag. Its performance and inspection methods shall comply with the relevant provisions of GB/T8946. Each The net content of the bag is 25kg or 50kg. 6.4 For industrial tripotassium hexacyanoferrate packaging, the inner bag is sealed or tied with a sealing machine, and the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches are neat, the needle length is even, and there is no leakage or skipping. 6.5. During transportation, industrial tripotassium hexacyanoferrate should be covered to prevent rain and moisture. It should not be mixed with acidic items. 6.6 Industrial tripotassium hexacyanoferrate should be stored in a ventilated and dry warehouse to prevent rain, moisture and sunlight exposure, and should not be mixed with acidic items.2 Instruments and equipment
Glass sand crucible: pore size 5μm~15μm.
4.4.3 Analysis steps
Weigh about 50g of sample (accurate to 0.1g), place it in a 500mL beaker, add about 100mL~150mL water, heat and stir until the sample is completely dissolved, filter it while hot with glass sand that has been dried to constant weight at 105℃~110℃, and wash it with hot water until no blue color appears when tested with ammonium ferric sulfate solution. Dry the residue at 105℃~110℃ to constant weight. 4.4.4 Expression of analysis results
The water-insoluble content (X4) expressed as mass percentage is calculated according to formula (4): X4= ma=m×100
Where: ml—mass of glass sand crucible, g; m2—mass of water-insoluble matter and glass sand crucible, g; m—mass of weighed sample, g.
4.4.5 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 0.005%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. 5.2 Each batch of products shall not exceed 5t.
5.3 Determine the number of sampling units in accordance with 6.6 of GB/T6678-1986. Each plastic woven bag is a packaging unit. ·（4
When sampling, insert the sampler obliquely from the top of the packaging bag into the material layer at 3/4 of the depth to take a sample. After mixing the sample, divide it into about 500g according to the quartering method, and pack it into two clean and dry wide-mouth bottles with ground stoppers and seal them. Stick labels on the bottles, indicating the 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 is kept for three months for reference. 5.4 Industrial tripotassium hexacyanoferrate 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 each batch of products shipped from the factory meets the requirements of this standard. If one of the test results does not meet the requirements of this standard, re-sampling should be carried out from twice the number of sampling units of the batch of products for re-testing. If even one of the re-test results does not meet the requirements of this standard, the entire batch of products shall be deemed unqualified. 5.5 Determine whether the test results meet the standards by the rounded value comparison method specified in 5.2 of GB/T1250-1989. 923
6 Marking, packaging, transportation and storage
HG/T2966-1999
6.1 The packaging bags of tripotassium hexacyanoferrate should have a firm and clear label. The mark shall include the manufacturer’s name, address, product name, trademark, grade, net content, batch number or production date, the number of this standard and the “moisture-afraid” mark in GB191. 6.2 Each batch of industrial tripotassium hexacyanoferrate products shipped out of the factory shall be accompanied by a quality certificate, which shall include the manufacturer’s name, address, product name, grade, net content, batch number or production date and the number of this standard. 6.3 The inner packaging of industrial tripotassium hexacyanoferrate shall be a plastic film bag with a thickness of not less than 0.05mm, and the outer packaging shall be a plastic woven bag. Its performance and inspection methods shall comply with the relevant provisions of GB/T8946. Each The net content of the bag is 25kg or 50kg. 6.4 For industrial tripotassium hexacyanoferrate packaging, the inner bag is sealed or tied with a sealing machine, and the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches are neat, the needle length is even, and there is no leakage or skipping. 6.5. During transportation, industrial tripotassium hexacyanoferrate should be covered to prevent rain and moisture. It should not be mixed with acidic items. 6.6 Industrial tripotassium hexacyanoferrate should be stored in a ventilated and dry warehouse to prevent rain, moisture and sunlight exposure, and should not be mixed with acidic items.
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