Some standard content:
HG/T 2833-1997
The superior products of this standard are equivalent to the technical conditions of industrial zinc dihydrogen phosphate of Russia TOCT16992:1978 (1994), and the superior products have reached the international advanced level. The first-class products are formulated according to the enterprise standards and have reached the domestic advanced level. The main differences between this standard and TOCT16992:1978 (1994):
1OCT16992:1978 (1994) are not graded. This standard is divided into two levels according to user requirements: superior products and first-class products. 2IOCT16992:1978 (1994) has three indicators: zinc (Zn) content, phosphoric acid and phosphate (in terms of P, Os) content, and free acid (in terms of PO:) content. In addition to retaining the above three indicators, this standard has added three more indicators according to user requirements: sulfate (in terms of SO.) content, lead (Pb) content, and asphalt (As) content.
3 The determination of zinc content in the test method is equivalent to the EDTA complexometric titration method in rOCT16992:1978 (1994). The determination of phosphorus pentoxide is determined by the photoelectric colorimeter in the Russian standard, and the quinoline molybdate gravimetric method is used in this standard. The determination methods of other items are all based on relevant Chinese 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 the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The drafting units of this standard are: Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Hunan Chemical Reagent General Factory, Chongqing Chemical Reagent General Factory, Chongqing South China Chemical Factory.
The main drafters of this standard are: Liu Shuying, Yin Zhaowu, Lin Wenxin, Jiang Xingchang, Yu Chaohui. This standard is entrusted to the technical unit responsible for the standardization of inorganic salt products of the Ministry of Chemical Industry for interpretation. 735
Chemical Industry Standard of the People's Republic of China
Industrial zinc dihydrogen phosphate
Zinc dihydrogen phosphate for industrial useHG/T 2833—1997
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of industrial zinc dihydrogen phosphate. This standard applies to industrial zinc dihydrogen phosphate obtained by the reaction of zinc oxide or metallic zinc with phosphoric acid. This product is mainly used as an anti-rust phosphating agent for metal surfaces, a colorant in the ceramic industry, and a clarifier in the glass industry. Molecular formula: Zn(H,PO)2·2H2O
Relative molecular mass: 295.38 (according to the 1993 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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191-1990 Pictorial markings for packaging, storage and transportation
GB/T601-1988 Preparation of standard solutions for titration analysis (volumetric analysis) of chemical reagents GB/T 602—1988
Preparation of standard solutions for determination of impurities in chemical reagents (negISO6353-1:1982) GB/T 603--1988
Preparation of preparations and products used in test methods for chemical reagents (negISO6353-1:1982) GB/T 610.11988
GB/T 1250--1989
General method for determination of arsenic in chemical reagents (monumental method) Method for expressing and determining limit values GB 6003—1985
5 Test sieves
GB/T 6678--1986
GB/T 6682—1992
GB/T 8946--1988
GB/T 8947--1988
3 Requirements
3.1 Appearance: white crystal.
General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987)Plastic woven bags
Composite plastic woven bags
3.2 Industrial zinc dihydrogen phosphate shall meet the requirements of Table 1. Table 1 Requirements
Content of phosphoric acid and phosphate (in terms of P, Os)
Content of zinc (Zn)
Content of free acid (in terms of H, PO.)
Approved by the Ministry of Chemical Industry of the People's Republic of China on February 4, 1997 736
Superior product
First-class product
Implemented on October 1, 1997
Content of sulfate (in terms of S())
Content of lead (Fb)
Content of arsenic (As)
4 Sampling
4.1 Each batch of products shall not exceed 5t.
HG/T 2833—1997
Table 1 (end)
Superior products
First-class products
4.2 Determine the number of sampling units according to the provisions of 6.6 of GB/T6678-1986. Each plastic woven bag is a packaging unit. When sampling, insert the sampler obliquely to 3/4 of the depth of the material layer to take samples. From each selected packaging unit, take out no less than 50g of sample, mix the sampled sample and reduce it to about 500g by quartering method, and immediately put it into two clean and dry wide-mouth bottles with ground stoppers and seal them. Paste labels on 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 for three months for reference.
4.3 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. If only one of the test results does not meet the requirements of this standard, the entire batch of products shall be deemed unqualified. 5 Test method
5.1 Determine whether the test results meet the standards by the rounded value comparison method specified in 5.2 of GB/T1250-1989. 5.2 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/T602 and GB/T603.
5.3 Determination of phosphoric acid and phosphate (in terms of P,O) content 5.3.1 Summary of method
In an acidic medium, all phosphates in the test solution form precipitation with the added quinoline molybdate. After filtering, drying and weighing, the phosphoric acid and phosphate content are calculated.
5.3.2 Reagents and Materials
5.3.2.1 Hydrochloric acid solution: 1+1;
Nitric acid solution: 1+1;
5.3.2.3 Preparation of quinomolybdic acid solution:
Weigh 70g sodium molybdate and dissolve it in 100ml water; weigh 60g citric acid and dissolve it in 150ml water and 85mL nitric acid; pour solution a into solution b under stirring; add 35mL nitric acid and 5mL quinoline to 100ml water; pour solution d into solution c, let it stand for 12h, filter it with a glass sand crucible, add 280mL acetone, dilute it to 1000ml with water, mix it. And store it in a polyethylene bottle. 5.3.3 Instruments and equipment
5.3.3.1 Glass crucible: pore size 5μm~15μm; 5.3.3.2 Electric oven: temperature can be controlled at 180℃±5℃. 5.3.4 Analysis steps
5.3.4.1 Preparation of test solution
Weigh about 5g of sample (accurate to 0.0002g), place in a 250mL beaker, add 50ml. water and 10ml hydrochloric acid solution until dissolved, transfer to a 500mL volumetric flask, dilute to scale with water, shake well (filter if necessary) This is solution A. Used for the determination of zinc content, lead (Pb) content, and asphalt (As) content.
5.3.4.2 Preparation of test blank solution
Except for not adding the sample, the amount of other reagents added is exactly the same as that of the test solution, and the same treatment is performed at the same time as the sample. 5.3.4.3 Determination
Pipette 10ml of test solution A and test blank solution into 250mL beakers respectively, add 10ml of nitric acid solution, add water to a total volume of about 100ml, and add 50ml.Quinoline molybdate solution, cover the surface with blood, heat in a water bath until the substance in the beaker reaches 75℃±5℃, keep warm for 30s (do not use open flames or stir during the addition of reagents and heating to avoid condensation). Cool, stir 3-4 times during the cooling process, and filter with a glass sand crucible that has been dried to constant weight at 180℃±5℃ in advance. First filter the upper clear liquid, rinse the precipitate 6 times with a washing bottle by pouring method, using about 30mL of water each time, and finally transfer the precipitate to a glass sand crucible for filtration, then wash the precipitate 4 times with water, place the glass sand crucible together with the precipitate in an electric oven and start timing from the time the temperature stabilizes, dry at 180℃±5℃ for 45min, take it out and cool it slightly, place it in a desiccator to cool to room temperature, and weigh it. 5.3.5 Expression of analysis results
The content of phosphoric acid and phosphate (in terms of P2Os) expressed as mass percentage X is calculated according to formula (1): (m1-ma) X0.03207 × 100
m×500
160.4 ×(ml m2)
Wherein: m.-mass of quinoline phosphomolybdic acid precipitate generated in the test solution, g; m2-
-mass of quinoline phosphomolybdic acid precipitate generated in the test blank solution, g; m-mass of the sample, g;
0.03207--coefficient for converting quinoline phosphomolybdic acid into phosphorus pentoxide. 5.3.6 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 0.2%. 5.4 Determination of zinc (Zn) content
5.4.1 Method summary
Under the condition of pH=10, Zn in the test solution is complexed with EDTA, and the zinc content is calculated by the amount of EDTA consumed. 5.4.2 Reagents and materials
5.4.2.1 Ammonia-ammonium chloride buffer solution A: pH=10; 5.4.2.2 Eriochrome black T indicator solution: 5g/L;
5.4.2.3 Standard titration solution of disodium ethylenediaminetetraacetic acid: cEDTA) is about 0.05mol/L. 5.4.3 Analysis steps
Use a pipette to transfer 25mL of solution A (5.3.4.1) into a 250mL conical flask, add 15mL of ammonia-ammonium chloride buffer solution A and 4 drops of eochrome black T indicator solution, and titrate with EDTA standard titration solution until the purple-red color changes to bright blue as the end point. 5.4.4 Expression of analysis results
The zinc (Zn) content X expressed as mass percentage is calculated according to formula (2): X = Ve × 0.065 39 × 100
m×500
130.78 × Vc
Wherein: V—the volume of EDTA standard titration solution consumed in titrating the test solution, mL; c—the actual concentration of EDTA standard titration solution, mol/L; 738
m—the mass of the sample, g;
HG/T 2833—1997
0.06537·: the mass of zinc in grams equivalent to 1.00 mL EDTA standard titration solution c (EDTA) = 1.000 mol/L. bZxz.net
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 0.2%. 5.5 Determination of free acid (in terms of H:PO) content 5.5.1 Summary of method
Use bromophenol blue as the indicator solution and titrate with sodium hydroxide standard titration solution to determine the free acid content. 5.5.2 Reagents and materials
5.5.2.1 Bromophenol blue indicator solution: 1g/L;
5.5.2.2 Sodium hydroxide standard titration solution c (NaOH) is about 0.1mol/L. 5.5.3 Analysis steps
Weigh 0.25g of sample (accurate to 0.0002g), place it in a 250mL conical flask, add 50mL of water until dissolved, add 4 drops of bromophenol blue indicator solution, and titrate with sodium hydroxide standard titration solution until the blue color is the end point. 5.5.4 Expression of analysis results
Free acid content (in terms of H:PO) expressed as mass percentage X: calculated according to formula (3): X = Vc × 0. 098 00 × 100
9.8 × Vc
Wherein: V--the volume of NaOH standard titration solution consumed by titrating the test solution, mL; C--the actual concentration of NaOH standard titration solution, mol/Lm; the mass of the sample, g;
0.09800--the mass of phosphoric acid in grams equivalent to 1.00mL NaOH standard titration solution Cc (NaOH) 1.000mol/LJ.
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 0.2%. 5.6 Determination of Sulfate Content
5.6.1 Summary of Method
In hydrochloric acid medium, sulfate radicals and barium ions generate white fine barium sulfate precipitates, which are compared with the standard solution to determine the sulfate content in the sample.
5.6.2 Reagents and Materials
5.6.2.1 Hydrochloric acid solution: 1+1;
5.6.2.2 Chloride solution: 250g/L;
5.6.2.3 Sulfate standard solution: 1mL contains 0.1mgSOk. 5.6.3 Analysis Steps
Weigh 1.0g of sample (accurate to 0.01g), place it in a 50mL colorimetric tube, add 20mL of water and 1mL of hydrochloric acid solution (filter if necessary). Add 2mL of barium chloride solution, dilute to the scale with water, shake the hook, and let it stand for 10min. Its turbidity shall not be greater than that of the standard turbidity solution. The standard turbidity solution is pipetted with a pipette: 1 mL of the superior product and 5 mL of the first-class product sulfate standard solution are placed in 50 mL colorimetric tubes and 20 mL of water is added to each of them and treated in the same way as the sample solution. 5.7 Determination of lead (Pb) content
5.7.1 Method summary
In dilute nitric acid medium, at a wavelength of 283.3 nm, using an air acetylene flame, the standard addition method 739
is used for determination.
5.7.2 Reagents and materials
5.7.2.1 Nitric acid solution: 1+1;
HG/T 2833—1997
5.7.2.2 Lead standard solution: 1mL contains 0.1mgPb5.7.3 Instruments and equipment
5.7.3.1 Atomic absorption spectrophotometer;
5.7.3.2 Lead hollow cathode lamp.
5.7.4 Instrument working conditions
5.7.4.1 Wavelength: 283.3nm;
5.7.4.2 Flame: air-acetylene.
5.7.5 Analysis steps
Weigh about 10g of sample (accurate to 0.01g), add 50mL of water and 5ml of nitric acid solution to dissolve the sample. Transfer to a 250ml volumetric flask, dilute to scale with water, and shake well. Use a pipette to transfer 25ml of the test solution to four 100ml volumetric flasks, and then use a pipette to add 0ml, 1ml, 2ml, and 3ml of the lead standard solution, dilute to scale with water, and shake well. According to the provisions of 5.7.4, adjust the instrument to the optimal condition, adjust to zero with water, and measure the absorbance.
Use the mass of lead as the horizontal axis and the corresponding absorbance as the vertical axis to draw a working curve. Extend the line in the opposite direction and the intersection with the horizontal axis is the lead content in the test solution.
5.7.6 Expression of analysis results
The lead (Pb) content X4 expressed as mass percentage is calculated according to formula (4): X4=
m×1000×100
Where: ml is the mass of lead in the test solution found from the working curve, mg; m is the mass of the sample, g.
5.7.7 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 0.003%. 5.8 Determination of arsenic (As)
5.8.1 Summary of the method
According to Chapter 3 of GB610.1-1988.
5.8.2 Reagents and materials
According to Chapter 4 of GB610.1-1988 and arsenic standard solution: 1mL contains 0.01mgAs. (4)
Preparation: Use a pipette to transfer 10mL of the arsenic standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute to the mark with water, and shake well.
5.8.3 Instruments and equipment
According to Chapter 5 of GB610.1--1988.
5.8.4 Analysis steps
Use a pipette to transfer 10 ml of solution A5.3.4.1) into a wide-mouth bottle in a fixed container, dilute with water to 70 ml, add 6 ml of hydrochloric acid, and shake well. Add 1 g of potassium iodide and 0.2mL of stannous chloride solution (400g/L) is shaken and placed for 10 minutes. 2.5g of arsenic-free zinc is added and the device is immediately assembled according to the diagram. It is placed in a dark place at 25℃～30℃ for 1h～1.5h. The brown-yellow color of mercuric bromide test paper shall not be darker than the standard. The standard is to use a pipette to transfer 1.0mL of the standard solution and the test solution at the same time. 740
6 Marking, packaging, transportation and storage
HG/T2833—1997
6.1 The packaging bags of industrial zinc dihydrogen phosphate should have firm and clear markings, including: manufacturer name, 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 GB191-1990. 6.2 Each batch of industrial zinc dihydrogen phosphate shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, 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 zinc dihydrogen phosphate is packaged in polypropylene woven bags lined with two layers of plastic bags. The woven bags are used for packaging: the inner packaging is a polyethylene plastic film bag with a thickness of not less than 100%. Less than 0.08mm. The outer packaging adopts polypropylene woven bags, and its performance and inspection methods shall comply with the relevant provisions of GB/T8946~-1988B. The net weight of each bag of this product is 25kg and 40kg. Woven bag packaging: When packaging, put the industrial zinc dihydrogen phosphate into a polypropylene woven bag lined with a polyethylene plastic film bag, exhaust the remaining air in the bag, tie the two layers of inner bags with ropes four times, tie them tightly, and sew the outer bag with a sewing machine at a distance of not less than 17mm from the upper end of the bag, with a stitch length of 6mm~~7mm, neat stitches, and even stitch lengths. There are no leaks or skipped stitches. 6.4 Industrial zinc dihydrogen phosphate should be covered during transportation to prevent sun exposure, rain, and packaging damage. 6.5 Industrial zinc dihydrogen phosphate should be stored in a cool, dry and ventilated warehouse to prevent sun exposure, moisture, and packaging damage. 741
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.