Some standard content:
Chemical Industry Standard of the People's Republic of China
Process
Subject Content and Scope of Application
Sodium Borate
HG/T 2518-93
This standard specifies the technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of industrial sodium perborate. This standard applies to industrial sodium perborate. This product is mainly used in textile and daily chemical industries, etc. Molecular formula: NaBO, ·4H2O
Relative molecular mass: 153.86 (according to the international relative atomic mass in 1989) 2 Reference standards
GB190 Dangerous goods packaging mark
GB 191
Pictorial mark for packaging storage and transportation
GB/T601
Preparation of standard solution for titration analysis (volume analysis) of chemical reagents GB/T 602
Preparation of standard solution for determination of impurities of chemical reagents GB/T 603
Preparation of preparations and products used in test methods of chemical reagents Methods for expressing and determining limit values GB 1250
GB/T3049
GB/T 6678
GB/T 6682
GB/T 9724
3 Technical requirements
General method for determination of iron content in chemical products General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories General rules for determination of pH value of chemical reagents
3.1 Appearance: white fine crystals.
2 Industrial sodium perborate shall meet the requirements of the following table, 3.2
O-phenanthroline spectrophotometric method
Superior products
Sodium perborate (NaBO;·4H,O) content, % pH value (30g/L solution)
Iron (Fe) content, %
Fineness, 600μm test sieve residue, %
Note: If the user does not require, the fineness item can be exempted from inspection. 4 Test method
First grade
9.9~~10.9
The reagents and water used in this standard, unless otherwise specified, refer to analytically pure reagents and grade 3 water specified in GB/T6682. Approved by the Ministry of Chemical Industry of the People's Republic of China on September 8, 1993494
Implementation on July 1, 1994
HG/T2518--93
The standard solutions, impurity standard solutions, preparations and products required in the test, unless otherwise specified, shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603. 4.1 Determination of sodium perborate content
4.1.1 Summary of the method
In a strongly acidic medium, titrate the sodium perborate solution with a standard potassium permanganate titration solution until it turns slightly red. 4.1.2 Reagents and materials
4.1.2.1 Sulfuric acid (GB625) solution: 1+8; 4.1.2.2 Potassium permanganate (GB643) standard titration solution: c4.1.3 Analysis steps
KMnO) about 0.1 mol/L.
Weigh 0.3g of sample, accurate to 0.0002g, put it into a conical flask containing 100mL of sulfuric acid solution and adjust it to a slightly red color with potassium permanganate standard titration solution, shake it thoroughly to dissolve the sample. Titrate with potassium permanganate standard titration solution until the same slightly red color as before adding the sample, and keep it for 30s without disappearing as the end point.
4.1.4 Expression of analytical results
The sodium perborate (NaBO4H2O4) content (X,) expressed as mass percentage is calculated according to formula (1): X, cV×0. 076 93 × 100
Wherein: '
actual concentration of potassium permanganate standard titration solution, mol/L; volume of potassium permanganate standard titration solution consumed in titration, mL; (1
-mass of sodium perborate equivalent to 1.00 mL of potassium permanganate standard titration solution [c(-KMnO4H2O4)=1.000 mol/L) expressed in grams;
mass of sample, g.
4.1.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.2%. 4.2 Determination of pH value of solution
4.2.1 Reagents and materials
4.2.1.1 No carbon dioxide and water.
4.2.2 Instruments and equipment
4.2.2.1 Acidity meter: accuracy is 0.02 pH unit. With calomel reference electrode and glass measuring electrode. 4.2.3 Analysis steps
Weigh 3g of sample, accurate to 0.01g, and dissolve in 100mL of water (4.2.1.1). According to Article 6 of GB/T9724, measure the pH value with an acidity meter.
4.2.4 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.1 pH unit. 4.3 Determination of iron content
4.3.1 Summary of method
Same as Article 2 of GB/T3049.
4.3.2 Reagents and materials
Same as Article 3 of GB/T3049.
4.3.3 Instruments and equipment
4.3.3.1 Spectrophotometer: with an absorption cell with a thickness of 3 cm. 4.3.4 Analysis steps
4.3.4.1 Drawing of “T. curve
HG/T 2518- 93
See GB/T3049, Article 5.3, select an absorption cell with a thickness of 3 cm and the corresponding amount of iron standard solution, and draw the working extraction line. 4.3.4.2 Preparation of test solution
According to the iron content in the sample, weigh an appropriate amount of sample (4g for superior products, 2g for inferior products), accurate to 0.01g, place it in a 250ml tall beaker, add 20ml of water and 4ml of 1+1 hydrochloric acid solution, place the beaker in a boiling water bath and evaporate until just dry, add 20ml of water, and dissolve it in warm water. 4.3.4 .3 Preparation of blank test solution
In a 250mL tall beaker, prepare a blank test solution using all the reagents used to prepare the test solution and the same amount and the same operation. 4.3.4.4 Determinationbzxz.net
For the test solution and the blank test solution, proceed according to Article 5.4 of GB3049, starting from "If necessary, add water to 60mL."
4.3.5 Expression of analysis results
The iron (Fe) content (X,) expressed as a mass percentage is calculated according to formula (2): (ml = mg) × 10-3
0. 1 × (m)
—The mass of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: m,-
—The mass of iron found from the working curve based on the measured absorbance of the blank test solution, mg; m.
—The mass of the sample, g.
4.3.6 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 0.0005%. 4.4 Determination of fineness
4.4.1 Instruments and equipment
4.4.1.1 Test sieve (GB6 003): R40/3 series. $200X50/0.600mm, with sieve bottom and sieve cover. 4.4.2 Analysis steps
(2)
Weigh 50g of sample, accurate to 0.01g, place it in the test sieve, and sieve it by hand until no sample passes through. Weigh the mass of the sieve residue on the sieve, accurate to 0.01g.
4.4.3 Expression of analysis results
The 600μm test sieve residue (X,) expressed as a mass percentage is calculated according to formula (3): m×100
—mass of the 600um sieve residue + g;
Where: m -
-The mass of the test material, g.
4.4.4 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.5%. 5 Inspection rules
5.1 Industrial sodium perborate shall 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 leaving the factory meet the requirements of this standard.
Each batch of products leaving the factory shall be accompanied by a quality certificate, which shall include: manufacturer name, product name, grade, net weight, batch number or production date, proof that the product quality complies with this standard and the number of this standard. 5.2 The user unit has the right to accept the industrial sodium perborate received in accordance with the provisions of this standard. 5.3 Each batch of industrial sodium perborate shall not exceed 5t. .196
HG/T2518-93
5.4 The sampling of industrial sodium perborate shall be in accordance with GB/T6678 Section 6.6. Determine the number of sampling units. When sampling, insert the center of the white packaging bag of the sampler vertically to 3/4 of the depth of the material layer. After mixing the sampled products, reduce them to no less than 500g by quartering method. Pack the samples in two clean, dry, wide-mouth bottles with ground stoppers and seal them. Paste labels on the bottles, indicating the manufacturer's 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 3 months for future reference. 5.5 If any index of the inspection result does not meet the requirements of this standard, it should be re-sampled from the packaging unit of twice the amount for verification. Even if one index of the verification result does not meet the requirements of this standard, the whole 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 and storage
6.1 Industrial sodium perborate packaging containers should have firm and clear markings, including: manufacturer name, product name, trademark, grade, net weight, batch number or production date, this standard number, "Mark 11 Oxidant Mark" specified in GB190 and "Mark 4 Heat-averse Mark" and "Mark 7 Moisture-averse Mark" specified in GB191.
6.2 Industrial sodium perborate is double-packed. The inner packaging is a polyethylene plastic film bag with a bag thickness of 0.14~0.20mm, and the bag mouth is double-tied or heat-sealed to prevent leakage; or a two-layer kraft paper bag is used, with a paper weight of not less than 80g per square meter, and the bag mouth is double-tied or mechanically sewn to prevent leakage. The outer packaging is a mobile top or wide-mouth steel drum packaging, the barrel body has two groups of several corrugations, and the barrel mouth edge and barrel bottom assembly should be double-layered. The barrel body and the barrel cover or hoop are matched and fastened. The thickness of the steel plate is 0.5mm. The net weight of each barrel is 25kg or 50kg. 6.3 Industrial sodium perborate should be covered during transportation to prevent rain, moisture or heat. 6.4 Industrial sodium perborate should be stored in a dry, clean and ventilated warehouse. It must not be piled in the open air and should be stored separately from flammable materials. 6.5 Under the transportation and storage conditions that meet this standard, industrial sodium perborate should meet the technical requirements of this standard for 6 months from the date of production. Additional notes:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Tianjin Hongqi Chemical Plant. The main drafters of this standard are Zhou Xuncheng, Su Peiji and Su Changyu. From the date of implementation of this standard, the original national standard GB1623-79 "Sodium Perborate" will be invalid. This standard refers to MIL-S-14022A1983 "Sodium Perborate Tetrahydrate". 197
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