Some standard content:
HG 2934---2000
This standard is a non-equivalent adoption of the "Zinc Sulfate" product specification in the "Japanese Feed Additives Law Compendium" (1995 edition) (hereinafter referred to as the "Compendium"), and is revised from the chemical industry standard HG2934--1987 "Feed Grade Zinc Sulfate". The main differences between this standard and the "Zinc Sulfate" product specifications in the "Essentials" are: This standard is divided into two categories: "Class 1 is zinc sulfate monohydrate, Class 2 is zinc sulfate heptahydrate: while the "Essentials" is divided into dry zinc sulfate and zinc sulfate heptahydrate.
一本标准! The zinc sulfate content of Class 1 products is not less than 94.7%, and the zinc sulfate content of Class 1 products is not less than 97.3%; the main content of dry zinc sulfate in the "Essentials" is not less than 80%, and the main content of zinc sulfate heptahydrate is 99.0%~102.0%. - This standard adds the index requirements for cadmium content compared to the "Essentials". ... In the test method for the determination of the main content, this standard adds the use of masking agents compared to the "Essentials", and the determination of lead content adopts disulfide trifluoromethane extraction colorimetry and atomic absorption spectrophotometry in parallel. The technical differences between this standard and HG2934--1987 are: ... The main content index of zinc sulfate is adjusted. The use of masking agents is added to the determination method of the main content, eliminating other metal ions. The interference of the elements can truly reflect the product quality. 1. This standard cancels the heavy metal index, replaces it with the lead content index, and adds the corresponding test methods. ... This standard adds the cadmium content index.
- This standard cancels the water-insoluble index.
This standard will replace HG2934--1987 from the date of implementation. Appendix A of this standard is a prompt appendix.
This standard was proposed by the former Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of the Inorganic Chemical Branch of the National Technical Committee for Chemical Standardization. The chapter units of this standard: Tianjin Chemical Research and Design Institute, Chengdu Shuxing Mineral Element Pretreatment Co., Ltd., Liuzhou Zinc Products Co., Ltd., Tianjin Luyao Co., Ltd.
The main drafters of this standard: Liu Shuying, Wang Yan, Wu Chunqing, Ma Ling, Chen Xiaobing, Wu Shiliang. This standard was first issued as the national standard GB8251-1987 in 1987. In 1997, it was adjusted to the chemical industry standard and numbered HG 2934---1987.
This standard is entrusted to the Inorganic Chemical Branch of the National Technical Committee for Chemical Standardization for interpretation. 118
Chemical Industry Standard of the People's Republic of China
Feed grade
Zinc sulfate
Feed grade-Zinc sulphate
HG 2934·---2000
Replaces I; 2934·1987
This standard specifies the requirements, test methods, inspection rules, marking, labeling, packaging, transportation and storage of feed-grade zinc sulfate. This standard applies to feed-grade zinc sulfate produced by the reaction of zinc-containing raw materials with sulfuric acid. After pretreatment, this product is used as a zinc supplement in feed
Molecular formula: ZnSO·H2O
Relative molecular mass: 179.47 (according to the 1997 international relative atomic mass)Molecular formula: ZnSO4·7H,0
Relative molecular mass: 287.56 (according to the 1997 international relative atomic mass)Cited standardsbzxz.net
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown are valid when the standard is published. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 60[--1988
GB/T 602---1988
Chemical reagents-Preparation of standard solutions for titration analysis (volumetric analysis)-Preparation of standard solutions for determination of impurities
Chemical reagents
GB/T 603--1988
Chemical reagents-Preparation of preparations and products used in test methods GB/T 6003.1-1997
Wire mesh test sieves
General rules for sampling of chemical products
GB/T 6678-1986
GB/T 6682--1992
GB 10648--1999
3 Classification
Specifications and test methods for analytical laboratory water (negISO3696:1987) Feed label
Feed-grade zinc sulfate is divided into two categories: Category 1 is zinc sulfate monohydrate; Category 1 is zinc sulfate heptahydrate. 4 Requirements
4.1 Appearance: Monohydrate zinc sulfate is white powder; heptahydrate zinc sulfate is colorless crystals. 4.2 Feed-grade zinc sulfate shall meet the requirements of Table 1. Table 1 Requirements
Zinc sulfate content
Zinc (Zn) content
Approved by the State Administration of Petroleum and Chemical Industry on June 5, 2000 Class
(ZnSO,·H,O)
(ZnSO, : 7H,0)
Implementation on March 1, 2001
Arsenic (As) content
Lead (Pb) content
Cadmium (Cd) content
Fineness, through 250μm test sieve
Through 800μm test sieve
Test method
HG 2934.- 2000
Table 1 (end)
(ZnsO, -HO)
(ZnS0, 7110)
The reagents and water used in this standard, unless otherwise specified, refer to analytically pure reagents and grade 1: water specified in GB/T6682. Standard titration solutions used in the test. Impurity standard solutions, preparations and products, unless otherwise specified, are prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603.
Safety Tips: The organic dithiocarbamide tetrafluoride solution used in this standard needs to be stored at low temperatures to avoid the formation of phosgene, which is harmful to human health; the strong acids and strong bases used in this test are all Corrosive, users should be careful to avoid contact with skin; if splashed on the skin, rinse immediately with plenty of water, serious cases timely treatment!
5.1 Identification test
5.1.1 Reagents and materials
5.1.1.1 Chloroform.
5.1.1.2 Acetic acid solution: 1+10.
5.1.1.3 Sodium sulfate solution: 250g/L. 5.1.1.4 Dithiol tetrachloride solution: 1+100. 5.1.1.5 Barium chloride solution: 50g/. | |tt||5.1.2 Identification method
5.1.2.1 Identification of zinc ions
Weigh 0.2g of sample and dissolve it in 5ml of water. Take 1ml of test solution and adjust the pH value of the solution to 4~~5 with acetic acid solution, add 2 drops of sodium sulfate solution, and then add a few drops of dithiocarbamide solution and 1mL of trifluoromethane. After shaking, the organic layer turns purple-red. 5.1.2.2 Identification of sulfate ions
Dissolve the sample in water and add barium chloride solution to produce a white precipitate. This white precipitate is insoluble in hydrochloric acid solution. 5.2 Determination of zinc sulfate content and zinc content
5.2.1 Summary of the method
Dissolve zinc sulfate in sulfuric acid solution, add appropriate amount of water, add ammonium fluoride solution, sulfur gland, and ascorbic acid as masking agents, adjust the pH value to 5-6 with acetic acid-sodium acetate solution, use xylenol orange as an indicator, and titrate with disodium ethylenediaminetetraacetic acid standard titration solution until the solution changes from purple-red to bright yellow.
5.2.2 Reagents and materials
5.2.2.1 Potassium iodide.
5.2.2.2 Ascorbic acid.
5.2.2.3 Thiourea solution: 200 g/1.
5.2.2.4 Ammonium fluoride solution: 200 g/L.
5.2.2.5 Sulfuric acid solution: 1+1.
HG 2934--2000
5.2.2.6 Acetic acid-sodium acetate buffer solution: pH 5.5. Weigh 200g sodium acetate, dissolve in water, add 10mL glacial acetic acid, dilute to 1000ml. 5.2.2.7 Ethylenediaminetetraacetic acid disodium standard titration solution: c(EDTA) about 0.05mol/lL. 5.2.2.8 Cresol orange indicator solution: 2g/l., use period not exceeding 1 week. 5.2.3 Analysis steps
Weigh 0.3g zinc sulfate heptahydrate sample (or 0.2g zinc sulfate monohydrate sample) (accurate to 0.0002g), place in a 250ml conical flask, add a small amount of water to moisten, add 2 drops of sulfuric acid solution to dissolve the sample, add 50ml water, 10ml ammonium fluoride solution, 2.5ml sulfur gland solution, 0.2g ascorbic acid, shake well to dissolve, add 15ml acetic acid-sodium acetate buffer solution and 3 drops of xylenol orange indicator solution, and titrate with ethylamine disodium acetate standard titration solution until the solution changes from red to bright yellow, which is the end point. Perform a blank test at the same time.
5.2.4 Expression of analytical results
The content of zinc sulfate heptahydrate (ZnSO4·7H2()) expressed as mass percentage (X,) is calculated according to formula (1): X(%) = (V-Vo) × 0.287 6 × 100
Wherein: c——actual concentration of disodium ethylenediaminetetraacetic acid standard titration solution, mol/L; Vi—volume of disodium ethylenediaminetetraacetic acid standard titration solution consumed by titrating the test solution, mL; V,—volume of disodium ethylenediaminetetraacetic acid standard titration solution consumed by titrating the blank solution, mL; (1)
—mass of sample, g;
—mass of 0.287 6-
zinc sulfate heptahydrate expressed in grams equivalent to 1.00 ml disodium ethylenediaminetetraacetic acid standard titration solution [c(EDTA) = 1.000 mol/L].
The content of zinc sulfate monohydrate (ZnSO·H,O) expressed as mass percentage (X) is calculated according to formula (2): X2(%)=c(V/-Vo)X0.179 5 )
Wherein: C—--actual concentration of disodium ethylenediaminetetraacetic acid standard titration solution, mol/L; VI—-volume of disodium ethylenediaminetetraacetic acid standard titration solution consumed by titrating the test solution, mL; V. Volume of disodium ethylenediaminetetraacetic acid standard titration solution consumed by titrating the blank solution, mL, (2)
m.…Mass of the sample..
0.1795----mass of zinc sulfate monohydrate expressed in grams equivalent to 1.00mL disodium ethylenediaminetetraacetic acid standard titration solution Lc (EDTA) = 1.000mol/L].
The zinc content expressed as mass percentage (X,) is calculated according to formula (3): X: (%) = c(V/-Vo) × 0. 065 39x
wherein - the actual concentration of the standard titration solution of disodium ethylenediaminetetraacetic acid, mol/L; V,--the volume of the standard titration solution of disodium ethylenediaminetetraacetic acid consumed by the titration of the test solution, mL; V. ——the volume of the standard titration solution of disodium ethylenediaminetetraacetic acid consumed by the titration of the blank solution, mL, (3)
m---the mass of the sample, g;
0.06539---the mass of zinc in grams equivalent to 1.00mL of the standard titration solution of disodium ethylenediaminetetraacetic acid [c(EDTA) = 1.000mol/L.
5.2.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the results of parallel determinations: zinc sulfate monohydrate and zinc sulfate heptahydrate shall not exceed 0.2%, and zinc (Zn) shall not exceed 0.15%. 5.3 Determination of arsenic content
5.3.1 Method Summary
HG 2934-2000
In an acidic medium, potassium iodide and stannous chloride reduce arsenic (V) to arsenic (III), which reacts with new hydrogen to form arsenic oxide. Arsenic hydrogen forms a stain on mercuric austenite test paper, which is compared with the standard stain. 5.3.2 Reagents and materials
5.3.2.1 Hydrochloric acid.
5.3.2.2 Potassium iodide
5.3.2.3 No metallic zinc.
5.3.2.4 Stannous nitride solution: 400g/L. 5.3.2.5 Standard solution: 1mL of solution contains 0.001mg of arsenic. Preparation: Use a pipette to take 1.00 mL of the arsenic standard solution prepared according to GB/T602, place it in a 100 mL volumetric flask, dilute it to the mark with water, and shake it well. Prepare the solution before use. 5.3.2.6 Mercuric bromide test paper.
5.3.2.7 Lead acetate cotton.
5.3.3 Instruments and equipment
Arsenic condenser.
5.3.4 Analysis steps
Weigh (1.0±0.01)g of sample, place in a wide-mouthed bottle of the arsenic analyzer, moisten with a small amount of water, add 6mL of hydrochloric acid to dissolve the sample, dilute with water to 70mL, add 1g of potassium iodide and 0.2ml of stannous chloride solution, shake well, let stand for 10min, add 2.5g of arsenic-free metal zinc, immediately plug a test tube pre-filled with lead acetate cotton and mercuric bromide test paper, and place in a dark place at 25~30C for 1~1.5h. The star-brown color of the mercuric bromide test paper shall not be darker than the color produced by the standard. The standard is to use a pipette to transfer 5ml of arsenic standard solution, place in a wide-mouthed bottle of the arsenic analyzer, and dilute with water to 70mL. Add 6ml of hydrochloric acid, and the following operations are handled in the same way as the sample. 5.4 Determination of lead content
5.4.1 Atomic absorption spectrophotometry (arbitration method) 5.4.1.1 Summary of the method
In dilute nitric acid medium, at the wavelength of 283.3nm of the atomic absorption spectrophotometer, use air-acetylene flame and adopt the standard addition method for determination.
5.4.1.2 Reagents and materials
) Nitric acid solution: 1+1.
b) Lead standard solution: 1ml. The solution contains 0.01mg lead and is prepared before use. Preparation: Use a pipette to transfer 10mL of the lead standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute it to the scale with water, and shake it well.
5.4.1.3 Instruments and equipment
a) Atomic absorption spectrophotometer.
b) Lead hollow cathode lamp.
5.4.1.4 Instrument working conditions
a) Wavelength: 283.3nm.
b) Flame: air-acetylene.
5.4.1.5 Analysis steps
Weigh about 30g of sample (accurate to 0.01g), dissolve in 50ml of water, add 5mL of nitric acid solution, transfer to a 250ml volumetric flask after dissolution, dilute to scale with water, and shake to hook. Use a pipette to transfer 25ml of test solution to 4 100ml volumetric flasks, then use a pipette to add 0, 10ml, 20ml, and 30ml of lead standard solution, dilute to scale with water, and shake to hook. According to 5.4, 1.4, adjust the instrument to the best working conditions, adjust to zero with water, and measure the absorbance. 15
HG 2934 --2000
Use the mass of lead as the horizontal axis and the corresponding absorbance as the vertical axis to draw a working curve. The point where the curve is extended inversely and intersects with the horizontal axis is the mass of lead in the test solution.
5.4.1.6 Expression of analysis results
The lead (Ph) content (X,) expressed as mass percentage is calculated according to formula (4): X(%)=
× 100=
mX1000
Wherein; m is the mass of lead in the test solution found from the working curve, mg; n is the mass of a sample, g.
5.4.1.7 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 0.0003%. (4
5.4.2 Dithiol Colorimetric Method
Safety Warning: Potassium cyanide, a highly toxic drug, is used during the operation of this method. Be careful not to allow it to come into contact with the skin or be inhaled by the human body. Potassium cyanide drugs and solutions must be stored as required for highly toxic drugs. Test waste liquid containing potassium cyanide shall be handled in accordance with the provisions in Appendix A. 5.4.2.1 Method Summary
Under alkaline conditions, potassium fluoride solution is used to mask interfering metal ions other than lead. At pH = 10, lead in the sample is extracted with dithiol-trichloroethane solution and color is developed with it. Compare it with the standard colorimetric solution to determine whether the lead content is within the limit. 5.4.2.2 Reagents and Materials
a) Hydroxylamine hydrochloride.
b) Ammonium citrate solution: 400g/L.
c) Ammonia-ammonium chloride buffer solution (A): pH = 10. d) Potassium cyanide solution: 150g/L.
e) Dithiol-chloroform solution: 0.02g/L. Preparation: Dissolve 0.02g of dithiol in 1L of trifluoromethane and store at 10℃ in the dark. f) Lead standard solution: 1ml of solution contains 0.010mg of lead. Preparation: Use a pipette to transfer 10.00ml 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. Prepare the dilution before use. 5.4.2.3 Analysis steps
Weigh (0.5±0.01)g of sample, place it in a 50mL colorimetric tube, add 25mL of water to dissolve, add 5mL of ammonium citrate solution, 5mL of ammonia-ammonium nitride buffer solution (A), and 10mL of potassium cyanide solution, and shake well. Add 0.5g of hydroxylamine hydrochloride and shake to mix. Add 5mL of dithiol-chloroform solution and shake for 1min. After the solution is separated, the color of the dithiol-dichloromethane extraction layer shall not be redder than the standard colorimetric solution. Use a pipette to transfer 1.00mL (zinc sulfate heptahydrate) or 0.50mL (zinc sulfate monohydrate) of lead standard solution to the standard colorimetric solution and treat it at the same time as the sample.
5.5 Determination of cadmium content
5.5.1 Summary of the method
In dilute nitric acid medium, at a wavelength of 228.8nm, using air-acetylene flame, the standard curve method is used for determination.
5.5.2 Reagents and materials
5.5.2.1 Nitric acid solution: 1+1.
5.5.2.2 Cadmium standard solution: 1mL contains 0.01mg cadmium. Preparation: Use a pipette to transfer 10mL of the cadmium standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute to the scale with water, and shake well.
5.5.3 Instruments and equipment
5.5.3.1 Atomic absorption spectrophotometer.
5.5.3.2 Cadmium hollow cathode lamp.
5.5.4 Instrument working conditions
5.5.4.1 Wavelength: 228.8nm.
5.5.4.2 Flame: air-acetylene.
5.5.5 Analysis steps
HG29342000
Weigh about 1g of sample (accurate to 0.01g), dissolve it in 30mL of water, add 5ml of nitric acid solution, transfer it into a 100ml volumetric flask after dissolution, dilute it to the scale with water, and shake it well.
In a series of 100ml volumetric flasks, use a pipette to transfer 0, iml, 2ml, 3mL, and 4mL of cadmium standard solution, add 5ml of nitric acid solution to each, dilute it to the scale with water, and shake it well. According to the provisions of 5.5.4, adjust the instrument to the best working conditions, adjust it to zero with water, and measure the absorbance of the test solution and the standard series solution. At the same time, perform a blank experiment.
Use the mass of cadmium in the standard series solution as the horizontal axis and the corresponding absorbance as the vertical axis to draw a working curve. 5.5.6 Expression of analysis results
The cadmium (Cd) content (X) expressed as mass percentage is calculated according to formula (5): Xs (%) =
0.1 (mi-mo)
(ml-mo)
m×1000
According to the measured absorbance of the test solution, the mass of cadmium in the sample is found from the working curve, mg; m: m -—-
m-—-According to the measured absorbance of the blank test solution, the mass is found from the working curve, mg; m The mass of the sample.g
5.5.7 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 0.0003%. 5.6 Determination of fineness
5.6.1 Summary of method
The sample is sieved through a series of standard sieves, and the product fineness is determined based on the mass of the sample passing through the sieve layer. (5)
5.6.2 Instruments and equipment
Test sieve: in accordance with the R40/3 series in GB/T6003.1. 200mm×50mm/250μm, Φ200mm×50mm/800μm. 5.6.3 Analysis steps
Weigh about 50g of sample (accurate to 0.1g), place it on the test sieve Lg200mm×50mm/250um (zinc sulfate monohydrate), Φ200mm×50mm/800μm (zinc sulfate heptahydrate), shake it horizontally at a speed of 2 times/s until no sample passes through the sieve layer, and move the sieved material under the test sieve to a dry surface blood of known mass and weigh it. 5.6.4 Expression of analysis results
Fineness expressed as mass percentage (X.) is calculated according to formula (6): X(%)\1=m2×100
Wherein: m1—mass of the material under the test sieve and the blood on the surface, g; m. Mass of the surface, g;
m. Mass of the sample.
5.6.5 Allowable difference
The arithmetic mean of the results of two parallel determinations is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.5%. 6 Inspection rules
6.1 All items specified in this standard are exit inspection items. 6.2 Each batch of products shall not exceed 20t.
(6)
HG 2934--2000
6.3 Determine the number of sampling units in accordance with the provisions of GB/T6678. When sampling, insert the sampler obliquely from the top of the packaging bag to three-quarters of the depth of the material layer to take samples. After the sample is fully mixed, it is divided into about 500g according to the quartering method, and immediately packed into two clean and dry wide-mouth bottles with stoppers and sealed. Labels are attached to the bottles, indicating: manufacturer 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 three months for reference.
6.4 Feed-grade zinc sulfate 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 feed-grade zinc sulfate shipped from the factory meets the requirements of this standard. Each batch of feed-grade zinc sulfate shipped from the factory shall be accompanied by a quality certificate, the content of which is the same as that of GB10648.
6.5 The user has the right to inspect and accept the received feed-grade zinc sulfate in accordance with the provisions of this standard, and the inspection and acceptance time shall be within 1 month after the arrival of the goods.
6.6 If any index of the test results does not meet the requirements of this standard, samples should be taken from twice the amount of packaging for re-testing. If even one index of the re-test results does not meet the requirements of this standard, the entire batch of products shall be unqualified. 7 Marks and labels
7.1 Feed-grade zinc sulfate packaging should have firm and clear marks. The contents include: manufacturer name, factory address, product name, trademark, "feed grade", net content, batch number or production date, product quality certification that meets this standard and this standard number. 7.2 Each batch of feed-grade zinc sulfate packaging shipped from the factory should have firm and clear marks printed in accordance with the requirements of GB10648. 8 Packaging, transportation, storage
8.1 Feed-grade zinc sulfate is packaged in plastic woven bags. Lined with a layer of food-grade polyethylene film bag, and covered with a polypropylene woven bag. The net content of each bag is 25kg, 40kg, and 50kg.
8.2 The inner bag is tied 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 outer bag 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 stitches are evenly spaced, and there is no leakage or skipping.
8.3 Feed grade zinc sulfate products should be stored to prevent sun exposure and rain, and it is forbidden to store them together with toxic and harmful substances. 8.4 Feed grade zinc sulfate products should be transported to prevent packaging from being damaged, sun exposure, and rain, and it is forbidden to transport them together with toxic and harmful substances. 163
HG2934—2000
(Appendix of Tips)
Treatment of waste liquid containing potassium cyanide
In order to prevent the pollution of waste liquid containing potassium chloride, waste liquid containing potassium cyanide should be post-treated after daily analysis before discharge. A1 Method Summary
Under alkaline conditions, divalent iron and cyanide ions generate stable complex ions A2
Treatment Steps
Collect the waste liquid in a 500mL beaker, add 50mL of 1200g/L ferrous sulfate solution, stir, and discharge after sufficient reaction. 1. All the reagents used should be industrial grade.m -—-
m-—-Based on the measured absorbance of the blank test solution, the mass is found from the working curve, mg; mThe mass of the sample.g
5.5.7 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 0.0003%. 5.6 Determination of fineness
5.6.1 Summary of the method
The sample is sieved through a series of standard sieves, and the product fineness is determined based on the mass of the sample passing through the sieve layer. (5)
5.6.2 Instruments and equipment
Test sieve: in accordance with the R40/3 series in GB/T6003.1. $200mm×50mm/250μm, Φ200mm×50mm/800μm. 5.6.3 Analysis steps
Weigh about 50g of sample (accurate to 0.1g), place it on the test sieve Lg200mm×50mm/250um (zinc sulfate monohydrate), Φ200mm×50mm/800μm (zinc sulfate heptahydrate), shake it horizontally at a speed of 2 times/s until no sample passes through the sieve layer, move the sieved material under the test sieve to a dry surface blood of known mass, and weigh it. 5.6.4 Expression of analysis results
The fineness expressed as mass percentage (X.) is calculated according to formula (6): X(%)\1=m2×100
Where: m1—mass of the material under the test sieve and the surface blood, g; m. Mass of the surface, g;
m. Mass of the sample.
5.6.5 Allowable difference
Take the arithmetic mean of the results of two parallel measurements as the measurement result. The absolute difference of the parallel determination results shall not exceed 0.5%. 6 Inspection rules
6.1 All items specified in this standard are exit inspection items. 6.2 Each batch of products shall not exceed 20t.
(6)
HG 2934--2000
6.3 Determine the number of sampling units in accordance with the provisions of GB/T6678. When sampling, insert the sampler obliquely from the top of the packaging bag to three-quarters of the depth of the material layer to take samples. After the sample is fully mixed, it is reduced to about 500g according to the quartering method and immediately divided into two clean and dry wide-mouth bottles with stoppers and sealed. Labels are attached to the bottles, indicating: manufacturer 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 three months for reference.
6.4 Feed grade zinc sulfate 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 the feed grade zinc sulfate shipped out of the factory meets the requirements of this standard. Each batch of feed grade zinc sulfate shipped out of the factory shall be accompanied by a quality certificate, the content of which is the same as that of GB10648.
6.5 The user has the right to inspect and accept the received feed grade zinc sulfate in accordance with the provisions of this standard, and the inspection time shall be within 1 month after the arrival of the goods.
6.6 If one of the indicators does not meet the requirements of this standard in the inspection results, samples shall be taken from the twice amount of packaging for re-inspection. If even one of the indicators does not meet the requirements of this standard in the re-inspection results, the entire batch of products shall be unqualified. 7 Marks and labels
7.1 The packaging of feed grade zinc sulfate shall be firmly and clearly marked. The contents include: manufacturer name, address, product name, trademark, "feed grade", net content, batch number or production date, proof that the product quality meets this standard and the number of this standard. 7.2 Each batch of feed-grade zinc sulfate shipped out of the factory should have a firm and clear mark printed in accordance with the requirements of GB10648. 8 Packaging, transportation, storage
8.1 Feed-grade zinc sulfate is packaged in plastic woven bags. Lined with a layer of food-grade polyethylene film bag, and covered with a polypropylene woven bag. The net content of each bag is 25kg, 40kg, and 50kg.
8.2 The inner bag is tied 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 edge of the bag, and the edge is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the edge of the bag. The stitches are neat, the stitches are evenly hooked, and there is no leakage or skipping.
8.3 Feed-grade zinc sulfate products should be stored to prevent sunlight and rain, and it is forbidden to store them together with toxic and harmful substances. 8.4 During the transportation of feed-grade zinc sulfate products, the packaging should be prevented from being damaged, exposed to the sun, or exposed to rain. It is prohibited to transport them together with toxic and hazardous substances. 163
HG2934—2000
(Appendix of Prompt)
Treatment of Waste Liquid Containing Potassium Cyanide
In order to prevent the contamination of waste liquid containing potassium chloride, waste liquid containing potassium cyanide should be post-treated after daily analysis before it can be discharged. A1 Method Summary
Under alkaline conditions, divalent iron and cyanide ions generate stable complex ions A2
Treatment Steps
Collect the waste liquid in a 500mL beaker, add 50mL of 1200g/L ferrous sulfate solution, stir, and discharge after sufficient reaction. 1. All the reagents used should be industrial grade.m -—-
m-—-Based on the measured absorbance of the blank test solution, the mass found from the working curve, mg; mThe mass of the sample.g
5.5.7 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 0.0003%. 5.6 Determination of fineness
5.6.1 Summary of the method
The sample is sieved through a series of standard sieves, and the product fineness is determined based on the mass of the sample passing through the sieve layer. (5)
5.6.2 Instruments and equipment
Test sieve: in accordance with the R40/3 series in GB/T6003.1. $200mm×50mm/250μm, Φ200mm×50mm/800μm. 5.6.3 Analysis steps
Weigh about 50g of sample (accurate to 0.1g), place it on the test sieve Lg200mm×50mm/250um (zinc sulfate monohydrate), Φ200mm×50mm/800μm (zinc sulfate heptahydrate), shake it horizontally at a speed of 2 times/s until no sample passes through the sieve layer, move the sieved material under the test sieve to a dry surface blood of known mass, and weigh it. 5.6.4 Expression of analysis results
The fineness expressed as mass percentage (X.) is calculated according to formula (6): X(%)\1=m2×100
Where: m1—mass of the material under the test sieve and the surface blood, g; m. Mass of the surface, g;
m. Mass of the sample.
5.6.5 Allowable difference
Take the arithmetic mean of the results of two parallel measurements as the measurement result. The absolute difference of the parallel determination results shall not exceed 0.5%. 6 Inspection rules
6.1 All items specified in this standard are exit inspection items. 6.2 Each batch of products shall not exceed 20t.
(6)
HG 2934--2000
6.3 Determine the number of sampling units in accordance with the provisions of GB/T6678. When sampling, insert the sampler obliquely from the top of the packaging bag to three-quarters of the depth of the material layer to take samples. After the sample is fully mixed, it is reduced to about 500g according to the quartering method and immediately divided into two clean and dry wide-mouth bottles with stoppers and sealed. Labels are attached to the bottles, indicating: manufacturer 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 three months for reference.
6.4 Feed grade zinc sulfate 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 the feed grade zinc sulfate shipped out of the factory meets the requirements of this standard. Each batch of feed grade zinc sulfate shipped out of the factory shall be accompanied by a quality certificate, the content of which is the same as that of GB10648.
6.5 The user has the right to inspect and accept the received feed grade zinc sulfate in accordance with the provisions of this standard, and the inspection time shall be within 1 month after the arrival of the goods.
6.6 If one of the indicators does not meet the requirements of this standard in the inspection results, samples shall be taken from the twice amount of packaging for re-inspection. If even one of the indicators does not meet the requirements of this standard in the re-inspection results, the entire batch of products shall be unqualified. 7 Marks and labels
7.1 The packaging of feed grade zinc sulfate shall be firmly and clearly marked. The contents include: manufacturer name, address, product name, trademark, "feed grade", net content, batch number or production date, proof that the product quality meets this standard and the number of this standard. 7.2 Each batch of feed-grade zinc sulfate shipped out of the factory should have a firm and clear mark printed in accordance with the requirements of GB10648. 8 Packaging, transportation, storage
8.1 Feed-grade zinc sulfate is packaged in plastic woven bags. Lined with a layer of food-grade polyethylene film bag, and covered with a polypropylene woven bag. The net content of each bag is 25kg, 40kg, and 50kg.
8.2 The inner bag is tied 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 edge of the bag, and the edge is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the edge of the bag. The stitches are neat, the stitches are evenly hooked, and there is no leakage or skipping.
8.3 Feed-grade zinc sulfate products should be stored to prevent sunlight and rain, and it is forbidden to store them together with toxic and harmful substances. 8.4 During the transportation of feed-grade zinc sulfate products, the packaging should be prevented from being damaged, exposed to the sun, or exposed to rain. It is prohibited to transport them together with toxic and hazardous substances. 163
HG2934—2000
(Appendix of Prompt)
Treatment of Waste Liquid Containing Potassium Cyanide
In order to prevent the contamination of waste liquid containing potassium chloride, waste liquid containing potassium cyanide should be post-treated after daily analysis before it can be discharged. A1 Method Summary
Under alkaline conditions, divalent iron and cyanide ions generate stable complex ions A2
Treatment Steps
Collect the waste liquid in a 500mL beaker, add 50mL of 1200g/L ferrous sulfate solution, stir, and discharge after sufficient reaction. 1. All the reagents used should be industrial grade.2 The inner bag is tied 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 outer bag 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 stitches are evenly hooked, and there is no leakage or skipping.
8.3 Feed grade zinc sulfate products should be stored to prevent sun exposure and rain, and it is forbidden to store them together with toxic and harmful substances. 8.4 Feed grade zinc sulfate products should be transported to prevent packaging from being damaged, sun exposure, and rain, and it is forbidden to transport them together with toxic and harmful substances. 163
HG2934—2000
(Appendix of Tips)
Treatment of waste liquid containing potassium cyanide
In order to prevent the pollution of waste liquid containing potassium chloride, waste liquid containing potassium cyanide should be post-treated after daily analysis before discharge. A1 Method Summary
Under alkaline conditions, divalent iron and cyanide ions generate stable complex ions A2
Treatment Steps
Collect the waste liquid in a 500mL beaker, add 50mL of 1200g/L ferrous sulfate solution, stir, and discharge after sufficient reaction. 1. All the reagents used should be industrial grade.2 The inner bag is tied 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 outer bag 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 stitches are evenly spaced, and there is no leakage or skipping.
8.3 Feed grade zinc sulfate products should be stored to prevent sun exposure and rain, and it is forbidden to store them together with toxic and harmful substances. 8.4 Feed grade zinc sulfate products should be transported to prevent packaging from being damaged, sun exposure, and rain, and it is forbidden to transport them together with toxic and harmful substances. 163
HG2934—2000
(Appendix of Tips)
Treatment of waste liquid containing potassium cyanide
In order to prevent the pollution of waste liquid containing potassium chloride, waste liquid containing potassium cyanide should be post-treated after daily analysis before discharge. A1 Method Summary
Under alkaline conditions, divalent iron and cyanide ions generate stable complex ions A2
Treatment Steps
Collect the waste liquid in a 500mL beaker, add 50mL of 1200g/L ferrous sulfate solution, stir, and discharge after sufficient reaction. 1. All the reagents used should be industrial grade.
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