Some standard content:
Chemical Industry Standard of the People's Republic of China
Subject Content and Scope of Application
HG/T 2526- 93
Replaces HG1-105277
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of stannous chloride. This standard applies to industrial stannous chloride obtained by the reaction of metallic tin and hydrochloric acid. This product is mainly used in mirror making and electroplating industries, and is also used as a reducing agent, mordant and bleaching agent.
Molecular formula: SnCl2·2H,0
Relative molecular mass: 225.65 (according to the international relative atomic mass of 1989) Reference standards
GB/T601 Preparation of standard solutions for titration analysis (volumetric analysis) of chemical reagents GB/T602 Preparation of standard solutions for determination of impurities in chemical reagents Preparation of preparations and products used in test methods of chemical reagents GB/T 603
GB/T 610.1
General method for determination of arsenic in chemical reagents (arsenic spot method) Expression method and judgment method of limit values GB 1250
GB/T6678 Sampling total for chemical products
GB/T6682 Specifications and test methods for water for analytical laboratories 3 Technical requirements
3.1 Appearance: colorless crystals.
3.2 Industrial stannous chloride should meet the requirements of the following table: %
SnCl22H.O contentHeavy metal content (Pb)
Sulfate content (SO.)
Arsenic (As) content
Approved by the Ministry of Chemical Industry of the People's Republic of China on September 8, 1993Superior product
First-class product
Implemented on July 1, 1994
4Test method
HG/T 2526-93
The reagents and water used in this standard refer to analytical pure reagents and grade 3 water specified in GB/T6682 unless otherwise specified. Standard solutions, impurity standard solutions, preparations and products required in the test shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603 unless otherwise specified.
4.1 Determination of stannous chloride content
4.1.1 Summary of the method
In an acidic medium, divalent tin reacts with ammonium ferric sulfate to reduce trivalent iron to divalent iron. Under sulfur-phosphorus mixed acid conditions, sodium diphenylamine sulfonate is used as an indicator and potassium dichromate standard titration solution is used to titrate the divalent iron, thereby calculating the stannous chloride content. 4.1.2 Reagents and materials
4.1.2.1 Sulfur-phosphorus mixed acid: Take 150mL of sulfuric acid (GB625) and add it to 500mL of water, then add 150mL of phosphoric acid (GB1282) and dilute to 1000mL;
4.1.2.2 Ammonium ferric sulfate (GB1279) solution: 100g/L. Weigh 10g of ammonium ferric sulfate, dissolve it in 25mL of hydrochloric acid (GB622), and dilute it to 100mL with water;
4.1.2.3 Potassium dichromate (GB642) standard titration solution: c(1/6K,Cr.O,) about 0.1mol/L; 4.1.2.4 Sodium diphenylamine sulfonate indicator solution: 5g/L. 4.1.3 Analysis steps
Weigh 0.4g of the sample, accurate to 0.0002g, and quickly place it in a conical flask containing 25mL of ammonium ferric sulfate solution. Heat to boiling. Add 50mL of water, 25mL of sulfur-phosphorus mixed acid, add water to about 200mL, add 3 drops of sodium diphenylamine sulfonate indicator solution, and titrate with potassium dichromate standard titration solution until the solution changes from green to purple, which is the end point. Perform a blank test at the same time.
4.1.4 Expression of analysis results
The content of stannous chloride (SnCl·2H,O) expressed as mass percentage (X,) is calculated according to formula (1): (V - V)·c× 0.112 8 × 100X=
_ 11. 28(V- Va).c
Wherein: c is the actual concentration of the standard potassium dichromate solution, mol/L; V is the volume of the standard potassium dichromate solution consumed by the titration sample, mL; V. During the blank test, the volume of potassium dichromate standard titration solution consumed, mL; (1)
0.1128——The mass of stannous chloride in grams equivalent to 1.00mL potassium dichromate standard titration solution [c(1/6K,Cr2O,)=1.000mol/L];
m ~ mass of the sample, g.
4.1.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.2%. 4.2 Determination of heavy metal content
4.2.1 Summary of the method
Use a mixture of hydrochloric acid and nitric acid to oxidize divalent tin to tetravalent tin, use citric acid to mask the interfering ions, and in an alkaline medium, sodium sulfide reacts with heavy metal ions to form colored sulfides. Visually compare the color with the standard colorimetric solution. 4.2.2 Reagents and materials
4.2.2.1 Hydrochloric acid (GB/T 622);
4.2.2.2 Nitric acid (GB/T626);
4.2.2.3 Citric acid (GB/T9855) solution: 500g/L; 522
HG/T 2526-93
4.2.2.4 Sodium hydroxide (GB/T629) solution: 100g/L; 4.2.2.5 Sodium sulfide (HG3-905) solution: 50g/L, prepared before use; 4.2.2.6 Lead standard solution: 1mL solution contains 0.01mgPb, prepared before use. Use a pipette to transfer 10mL of the lead standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute to the mark with water, and shake well.
4.2.3 Analysis steps
Weigh 1.000.01g of sample and place it in a 100mL beaker. Add 2mL hydrochloric acid and 3mL nitric acid, boil for 2min, and cool. Transfer to a 100ml volumetric flask, dilute to scale with water, and shake well. Use a pipette to transfer 10mL of the test solution and place it in a 50mL colorimetric tube, and add 2mL of citric acid solution. Use sodium hydroxide solution to adjust the pH value to about 7 (check with pH test paper), and add 5mL in excess, add 1mL of sodium sulfide solution, and dilute to scale with water. Shake well. Let it stand for 10min. The color of the star should not be darker than that of the standard colorimetric solution. Preparation of standard colorimetric solution: Use a pipette to transfer 5mL (for superior products) or 10mL (for first-class products) of lead standard solution, place it in a 50ml colorimetric tube, add water to 10mL, add 0.5mL of hydrochloric acid, and treat it in the same way as the test solution. 4.3 Determination of sulfate content
4.3.1 Method summary
Under acidic conditions, sulfate ions are precipitated with barium chloride. Visual turbidimetry is performed with barium sulfate standard turbidimetric solution. 4.3.2 Reagents and materials
4.3.2.1 95% Z alcohol (GB/T 671);
4.3.2.2 Hydrochloric acid (GB/T622) solution: 1+1; 4.3.2.3 Barium chloride (GB/T652) solution: 100g/L; 4.3.2.4 Sulfate standard solution: 1mL contains 0.1mgSO4. 4.3.3 Analysis steps
4.3.3.1 Preparation of test solution
Weigh 2.00±0.01g of sample, place in a 100mL beaker, add 6mL hydrochloric acid solution and dissolve. Transfer to a 100mL volumetric flask, add water to dilute to the mark, shake well (dry filter if necessary). Prepare test solution A. Used for the determination of sulfate and stele content. 4.3.3.2 Determination
Use a pipette to transfer 25mL of test solution A and place it in a 50mL colorimetric tube. Add 5mL of ethanol and 5mL of barium chloride solution. Add water to the mark, shake well, and place for 20 minutes. The turbidity should not be deeper than that of the standard turbidity solution. Preparation of standard turbidity solution: Use a pipette to transfer 2.5mL (for superior products) or 5.0mL (for first-class products) of sulfate standard solution, place it in a 50mL colorimetric tube, add 1.5mL of hydrochloric acid solution, and add water to 25mL. Treat it in the same way as the test solution. 4.4 Determination of arsenic content
4.4.1 Summary of the method
In an acidic solution, potassium iodide and stannous chloride are used to reduce As (V) to As (III). Zinc particles are added to react with the acid to produce new ecological hydrogen, which further reduces As (III) to arsine. When arsine gas reacts with mercuric bromide test paper, brown-yellow spots are produced, which are compared with the standard color spots.
4.4.2 Reagents and materials
4.4.2.1 Arsenic-free zinc (GB/T2304);
4.4.2.2 Potassium iodide (GB/T1272);
4.4.2.3 Hydrochloric acid (GB/T622) solution: 1+1; 4.4.2.4 Stannous chloride (GB/T638) solution: 400g/L; 4.4.2.5 Arsenic standard solution: 1mL contains 0.001mgAs, prepared before use. Use a pipette to transfer 1mL of the arsenic standard solution prepared according to GB602, place it in a 100mL volumetric flask, add water to the scale, and shake well; 4.4.2.6 Mercuric bromide (HG1398) test paper; 523
4.4.2.7 Lead acetate (HG3-974) cotton. 4.4.3 Instruments and equipment
\General laboratory instruments, equipment and
4.4.3.1 Specifiers.
See Chapter 5 of GB/T610.1.
4.4.4 Analysis steps
HG/T 2526-93
Use a pipette to transfer 2.50mL of test solution A and place it in the wide-mouth bottle of the arsenic analyzer. Add water to about 70mL, add 12mL of hydrochloric acid solution, 1g of potassium iodide, and 0.2mL of stannous chloride solution, and shake well. Let it stand for 10 minutes. Add 5g of arsenic-free zinc and plug the glass tube filled with lead acetate cotton and mercuric bromide test paper tightly on the wide-mouth bottle. Place it in a dark place at 25-30℃ for 1h. The color of the mercuric bromide test paper shall not be darker than the standard color spot. www.bzxz.net
Preparation of standard color spot: Use a pipette to transfer 2.50mL of arsenic standard solution and treat it in the same way as the test solution. 5 Inspection rules
5.1 Industrial stannous nitride 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 products shipped out of the factory meet the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate, which includes: manufacturer name, product name, grade, net weight, batch number or production date, proof that the product quality meets this standard and the number of this standard. 5.2 The user has the right to accept and inspect the industrial stannous chloride received in accordance with the provisions of this standard. The acceptance shall be carried out within one month from the date of arrival of the goods.
5.3 Each batch of products shall not exceed 10t.
5.4 The sampling of industrial stannous chloride shall determine the number of sampling units in accordance with Article 6.6 of GB/T6678. When sampling, peel off the sample with a thickness of about 5cm on the surface, and insert the sampler from the central vertical line of the packaging unit to 3/4 of the depth of the material layer to take a sample. After mixing the sample in a closed container, the average sample shall not be less than 500g. The sampled sample shall be divided into two clean, dry bottles with ground stoppers and sealed. A label is attached to the bottle, indicating: manufacturer name, product name, grade, 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. 5.5 If one of the indicators in the inspection results does not meet the requirements of this standard, the sample should be re-sampled from the packaging unit of twice the amount for verification. Even if one of the indicators in the verification results does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 The packaging container of industrial stannous chloride should have firm and clear markings, including: manufacturer name, product name, trademark, grade, net weight, batch number or production date and this standard number. 6.2 Industrial stannous chloride is packaged in three types. 6.2.1 Iron drum packaging. The inner packaging is made of two layers of polyethylene plastic film bags, with specifications and dimensions: 360mm×450mm or 530mm×500mm, and a thickness of 0.05mm. The outer packaging is made of iron drums, with specifications and dimensions: 280mm×320mm or 300mm×480mm, and a thickness of 0.5mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous chloride is 25 or 50kg. 6.2.2 Wooden barrel packaging. The inner packaging is made of two layers of polyethylene plastic film bags, with specifications and dimensions: 450mm×500mm, and a thickness of 0.05mm. The outer packaging is made of wooden barrels, with specifications and dimensions: $300mm×400mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous fluoride is 30kg.
6.2.3 Plastic barrel packaging. The inner packaging is made of two layers of polyethylene plastic film bags, with specifications and dimensions: 510mm×530mm, and a thickness of 0.05mm. The outer packaging is plastic barrels, with specifications and dimensions: $330mmX460mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous chloride is 40kg. 6.3 Industrial stannous fluoride adopts blue sealing method. 521
HG/T2526-93
6.3.1 When using iron barrels for packaging, the inner bag is tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the iron barrel is sealed and welded with a pressure cover. 6.3.2 When using wooden barrels for packaging, the inner bag is tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the wooden barrel is sealed with a lid and nailed. 6.3.3 When using plastic barrels for packaging, the inner bag is tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the plastic barrel is sealed with an inner lid and the outer lid is tightened. 6.4 Industrial stannous chloride should be covered during transportation. 6.5 Industrial stannous chloride should be stored in a dry and ventilated warehouse. 6.6 Industrial stannous chloride should meet the requirements of this standard within three months from the date of production. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Guanjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Guangzhou Lixin Chemical Factory. The main drafters of this standard are Li Jingge, Wang Qi, Peng Jialing, and Zhang Zhiwei. 5251 Iron barrel packaging. The inner packaging adopts two layers of polyethylene plastic film bags, with specifications and dimensions: 360mm×450mm or 530mm×500mm, and a thickness of 0.05mm. The outer packaging adopts iron barrels, with specifications and dimensions: 280mm×320mm or 300mm×480mm, and a thickness of 0.5mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous chloride is 25 or 50kg. 6.2.2 Wooden barrel packaging. The inner packaging adopts two layers of polyethylene plastic film bags, with specifications and dimensions: 450mm×500mm, and a thickness of 0.05mm. The outer packaging adopts wooden barrels, with specifications and dimensions: $300mm×400mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous fluoride is 30kg.
6.2.3 Plastic barrel packaging. The inner packaging adopts two layers of polyethylene plastic film bags, with specifications and dimensions: 510mm×530mm, and a thickness of 0.05mm. The outer packaging adopts plastic barrels, with specifications and dimensions: $330mmX460mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous chloride is 40kg. 6.3 Industrial stannous fluoride adopts a blue sealing method. 521
HG/T2526—93
6.3.1 When using iron barrels for packaging, the inner bag shall be tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the iron barrel shall be sealed and welded with a pressure cover. 6.3.2 When using wooden barrels for packaging, the inner bag shall be tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the wooden barrel shall be sealed with a lid and nailed. 6.3.3 When using plastic barrels for packaging, the inner bag shall be tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the plastic barrel shall be sealed with an inner cover and the outer cover shall be tightened. 6.4 Industrial stannous chloride shall be covered during transportation. 6.5 Industrial stannous chloride shall be stored in a dry and ventilated warehouse. 6.6 Within three months from the date of production, industrial stannous chloride shall meet the requirements of this standard. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Guanjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Guangzhou Lixin Chemical Plant. The main drafters of this standard are Li Jingge, Wang Qi, Peng Jialing, and Zhang Zhiwei. 5251 Iron barrel packaging. The inner packaging adopts two layers of polyethylene plastic film bags, with specifications and dimensions: 360mm×450mm or 530mm×500mm, and a thickness of 0.05mm. The outer packaging adopts iron barrels, with specifications and dimensions: 280mm×320mm or 300mm×480mm, and a thickness of 0.5mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous chloride is 25 or 50kg. 6.2.2 Wooden barrel packaging. The inner packaging adopts two layers of polyethylene plastic film bags, with specifications and dimensions: 450mm×500mm, and a thickness of 0.05mm. The outer packaging adopts wooden barrels, with specifications and dimensions: $300mm×400mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous fluoride is 30kg.
6.2.3 Plastic barrel packaging. The inner packaging adopts two layers of polyethylene plastic film bags, with specifications and dimensions: 510mm×530mm, and a thickness of 0.05mm. The outer packaging adopts plastic barrels, with specifications and dimensions: $330mmX460mm. The performance and inspection methods of each batch of packaging materials shall comply with relevant regulations. The net weight of each barrel of industrial stannous chloride is 40kg. 6.3 Industrial stannous fluoride adopts a blue sealing method. 521
HG/T2526—93
6.3.1 When using iron barrels for packaging, the inner bag shall be tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the iron barrel shall be sealed and welded with a pressure cover. 6.3.2 When using wooden barrels for packaging, the inner bag shall be tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the wooden barrel shall be sealed with a lid and nailed. 6.3.3 When using plastic barrels for packaging, the inner bag shall be tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the plastic barrel shall be sealed with an inner cover and the outer cover shall be tightened. 6.4 Industrial stannous chloride shall be covered during transportation. 6.5 Industrial stannous chloride shall be stored in a dry and ventilated warehouse. 6.6 Within three months from the date of production, industrial stannous chloride shall meet the requirements of this standard. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Guanjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Guangzhou Lixin Chemical Plant. The main drafters of this standard are Li Jingge, Wang Qi, Peng Jialing, and Zhang Zhiwei. 525
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