Some standard content:
HG 2933---2000
This standard is a text conversion of the chemical industry standard HG2933-1987 "Feed Grade Magnesium Sulfate"
This standard will replace HG2933--1987 from the date of implementation. This standard is proposed by the Policy and Regulations Department of the State Bureau of Petroleum and Chemical Industry. This standard is under the jurisdiction of the Inorganic Chemical Branch of the National Technical Committee for Chemical Standardization. The drafting unit of this standard: Tianjin Chemical Research and Design Institute of the Ministry of Chemical Industry. The main drafter of this standard: Su Peiji.
This standard was first issued as the national standard GB8250--1987 on May 1, 1988. It was adjusted to the chemical industry standard in 1997 and numbered HG 2933-1987.
This standard is entrusted to the Inorganic Chemical Branch of the National Technical Committee for Chemical Standardization for interpretation. 142
Chemical Industry Standard of the People's Republic of China
Feed Grade
Magnesium Sulfate
Feed Grade Magnesium SulfateHG 2933-.2000
Replaces HG29331987
This standard specifies the requirements, test methods, inspection rules, marking, labeling, packaging, transportation and storage of simple feed grade magnesium sulfate. This standard applies to feed grade magnesium sulfate. This product is used as a magnesium supplement in feed processing. Molecular formula: MgS0,·7H20)
Relative molecular mass: 246.47 (according to the 1997 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 parties using this standard should explore the possibility of using the latest version of the following standards. Chemical reagents-Preparation of standard solutions for titration analysis (volumetric analysis) GB/T 601 --- 1988
GB/T 602 --1988
GB/T 603--1988
Preparation of standard solutions for determination of impurities
Chemical reagents
Preparation of preparations and products used in chemical reagent test methods GB/T 6003.1.-1997
GB/T 6678—1986
Wire mesh test sieves
General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (neg1503696:1987) GB/T 6682--1992
GB 10648 --1999
3 Requirements
Feed Label
Appearance: colorless crystal or amber powder.
Feed grade magnesium sulfate shall comply with the requirements of Table 1.
Table 1 Requirements
Magnesium sulfate (MgS0). ·7H2()) content, %Magnesium sulfate (calculated as Mg) content.%
As content, %
Heavy metal (calculated as Pb) content.%
Oxide (calculated as CI) content, %
Clearance test
Fineness (passing 400μm test sieve).%
Approved by the State Administration of Petroleum and Chemical Industry on June 5, 2000
Implementation on March 1, 2001
4Test method
HG2933---2000
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 solution, impurity standard solution, preparation and products used in the test, unless otherwise specified, shall be prepared in accordance with the provisions of (13/T601GB/T602, GB/T603.
Safety Tips: The hydrochloric acid used in the test is a corrosive product, so be careful when operating! 4.1 Identification
4.1.1 Reagents and Materials
4.1..1.1 Ammonium Chloride.
4.1.1.2 Ammonia Solution: 2+3.
4.1.1.3 Ammonium Carbonate Solution: 200g/1.. Preparation: Weigh 20g ammonium carbonate, add 20ml ammonia water, Add water to 100ml. 4.1.1.4, Sodium dihydrogen phosphate solution: 50g/L. 4.1.1.5, Barium chloride solution: 50g/L.
4.1.2 Identification method
4.1.2.1 Dissolve the sample in water, add ammonia water, and a white precipitate will be generated. Add ammonium chloride solution, and the precipitate will dissolve. Then add sodium dihydrogen phosphate solution to generate a white precipitate, which is insoluble in ammonia water. 4.1.2.2 Dissolve the sample in water, add barium chloride solution, and a white precipitate will be generated. 4.2 Determination of magnesium sulfate content
4.2.1 Summary of method
Dissolve the sample in water, add barium chloride solution, and a white precipitate will be generated. Dissolve in water, then add ammonia-ammonium chloride buffer solution with pH 10, and titrate with ethylenediaminetetraacetic acid disodium standard titration solution using chrome black T as indicator.
4.2.2 Reagents and materials
4.2.2.1 Ammonia water.
4.2.2.2 Ammonium chloride.
4.2.2.3 Ammonia-ammonium chloride buffer solution: pH ~ 10. 4.2.2.4 Standard titration solution of ethylenediaminetetraacetic acid disodium: c (EDTA) is about 0.05 mol/1. 4.2.2.5 Chrome black T indicator: 5 g/1.
4.2.3 Analytical steps Steps
Weigh 1g of sample (accurate to 0.0002g), dissolve it in water, transfer it to a 100mL volumetric flask, add water to the mark, and shake well. Use a pipette to transfer 25ml of solution and place it in a 250mL conical flask. Add 50ml of water, 10ml of ammonia-ammonium chloride buffer solution and 5 drops of chrome black T indicator, and titrate with disodium ethylaminetetraacetic acid standard titration solution until the solution changes from purple-red to pure blue. 4.2.4 Expression of analysis results
The magnesium sulfate (MgSO4·7H2O) content (X) expressed as mass percentage is calculated according to formula (1): X(%)=Vcx0. 246 5×100
The magnesium sulfate content (in terms of Mg) expressed in mass percentage (X,) is calculated according to formula (2): Ve×0. 024 31 ×100=2. 431VcX2(%) =
Wherein: V-volume of disodium ethylenediaminetetraacetic acid standard titration solution consumed in titration, mL; m
actual concentration of disodium ethylenediaminetetraacetic acid standard titration solution, mol/L; (1)
(2)
m-mass of sample, g;
0.2465--~the amount of magnesium sulfate (MgS()) equivalent to 1.00ml. disodium ethylenediaminetetraacetic acid standard titration solution [c (EDTA) = 1.000mol/L}, expressed in grams11
HG 2933--2000
·7H,0) mass: 0.02431 The mass of magnesium in grams equivalent to 1.00mL of ethylenediaminetetraacetic acid disodium standard titration solution [c(EDTA1.000mol/1.].
4.2.5 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 0.3%. 4.3 Determination of arsenic content
4.3.1 Summary of the method
In acidic medium, metallic zinc will be The substance is reduced to hydrogen arsenide, which forms a brown-yellow arsenic spot on the mercuric bromide test paper, which is compared with the standard arsenic spot.
4.3.2 Reagents and materials
4.3.2.1 Hydrochloric acid.
Potassium iodide.
Non-metallic zinc.
Tin chloride hydrochloric acid solution: 400g/L.
Lead acetate cotton. bzxZ.net
Mercuric bromide test paper.
4.3.2.7 Arsenic standard solution: 1ml contains 0.001mg of arsenic. According to (GB /T602 was diluted 100 times after preparation, and the diluent was prepared when used. 4.3.3 Instruments and equipment
Monument setter.
According to the device in Figure 1 of (B/T610~1988).
4.3.4 Analysis steps
Weigh (1.00±0.01)g of sample, put it in a wide-mouth bottle, dissolve it with 70mL of water, add 6mL of hydrochloric acid, add 1g of potassium iodide, 0.2ml of stannous chloride solution, shake well, and let it stand for 10min. Add 2.5mg of non-monumental metal zinc, Put the glass tube filled with lead acetate cotton and mercuric bromide test paper in the test paper and place it in a dark place at 25-30℃ for 1-1.5 hours. The brown-yellow color of mercuric bromide test paper shall not be darker than the standard. 4.4 Determination of heavy metal content
4.4.1 Method summary
In a weakly acidic medium, the heavy metal in the sample reacts with hydrogen sulfide to form a brown sulfide precipitate, which is compared with the standard. 4.4.2 Reagents and materials
4.4.2.1 Ascorbic acid,
4.4.2.2 Glacial acetic acid solution: 1+6.
4.4.2.3 Saturated hydrogen sulfide water (prepared before use). 4.4.2.4 Lead standard solution: 1mL contains 0.01mg lead. Prepare according to GB/T602 and dilute 10 times. Prepare the diluent when using. 4.4.3 Instruments and equipment
Colorimetric tube: 50mL (with scale at 25mL). 4.4.4 Analysis steps
Weigh (0.50±0.01)g of sample, place it in a colorimetric tube, add 2mL of glacial acetic acid solution, add 0.5g of ascorbic acid, dilute with water to 25ml., add 10ml. saturated hydrogen sulfide water, shake the hook, place in a dark place for 10min, and its color shall not be darker than the standard. The standard is to transfer 10ml. of lead standard solution, place it in a colorimetric tube, and treat it in the same way as the sample. 4.5 Determination of chloride content
4.5.1 Method summary
In acidic medium, chloride ions react with silver nitrate to produce white turbidity, which is compared with the standard. 115
4.5.2 Reagents and materials
4.5.2.1 Nitric acid.
4.5.2.2 Litmus paper.
4.5.2.3 Nitric acid solution: 1+15.
4.5.2.4 Silver nitrate solution: 20g/L.
HG2933--2000
4.5.2.5 Chloride standard solution: 1mL contains 0.1mg chlorine. 4.5.3 Instruments and equipment
Colorimetric tube: 50mL.
4.5.4 Analysis steps
Weigh (1.00±0.01)g of sample, place in a colorimetric tube, add water to dissolve it to 25ml. (If it is alkaline, add nitric acid solution to make litmus paper show neutral reaction), then add 10mL of nitric acid solution. If the solution is not clear, filter it, place it in a colorimetric tube, add water to make it about 40ml, add 1mL of silver nitrate, add water to 50mL, shake well, place it in a dark place for 5min, and compare it with the standard chloride solution. Its turbidity shall not be deeper than the standard. The standard is to transfer 1.4mL of chloride standard solution, place it in a colorimetric tube, and treat it in the same way as the sample. 4.6 Clarity test
Weigh (5.0±0.1)g of sample, add 20mL of water to dissolve it, and the solution should be clear and transparent without white turbidity. 4.7 Determination of fineness
4.7.1 Instruments and equipment
Test sieve: in accordance with GB/T6003.1R40/3 series. $200mm×500mm/400μm. 4.7.2 Analysis steps
Weigh 10g of sample (accurate to 0.1g), place it on the test sieve for sieving, and weigh the sieve underweight (accurate to 0.1g). 4.7.3 Expression of analysis results
The fineness (X,) expressed as mass percentage is calculated according to formula (3): X: (%)-㎡×100
The mass of the test sieve underweight, g;
Where: mr-—
The mass of the sample, g.
4.7.4 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 1%. 5 Inspection rules
5.1 All items specified in this standard are factory inspection items. (3)
5.2 Each batch of feed-grade magnesium sulfate shall not exceed 5t. 5.3 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 one-fourth of the depth of the material layer to take samples. After mixing the collected samples, reduce them to no less than 500g according to the quartering method, and pack them into two clean and dry bottles and seal them. Label the bottles with the following: manufacturer name, product name, batch number, shelf life, sampling date and name of the sampler. One bottle is used for inspection and the other is kept for three months for future reference.
5.4 Feed-grade magnesium 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 magnesium sulfate leaving the factory meets the requirements of this standard. 5.5 The user has the right to inspect and accept the received feed-grade magnesium sulfate in accordance with the provisions of this standard. The inspection time shall be within one month after the arrival of the goods.
5.6 If any index of the inspection result does not meet the requirements of this standard, the sample shall be taken from the twice amount of packaging for re-inspection. If even one index of the re-inspection result does not meet the requirements of this standard, the whole batch of products shall be unqualified. 116
6 Marking and labeling
HG 2933 --2000
6.1 Feed grade magnesium sulfate should be packaged with firm and clear markings, including: manufacturer name, factory address, product name, trademark, shelf life, "simple material grade sample", net content, batch number or production date and this standard number. 6.2 Each batch of feed grade magnesium sulfate shipped should be accompanied by firm and clear markings printed in accordance with the requirements of GB10648. 7 Packaging, transportation and storage
7.1 The inner packaging of feed grade magnesium sulfate adopts polyethylene plastic film bags with a thickness of not less than 0.05mm. The outer packaging adopts plastic woven bags with a net content of 25kg per bag.
The inner bag is tied twice with nylon rope, or with the same Other equivalent sealing methods. 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 and the stitch lengths are even. There are no leaks or skipped stitches.
7.2 During transportation, feed-grade magnesium sulfate should be covered to prevent rain and moisture. It should be handled with care and is prohibited from being transported together with toxic substances. 7.3 Feed-grade magnesium sulfate should be stored in a cool and dry place, avoid open-air storage, and is prohibited from being mixed with toxic substances. The product has a shelf life of six months from the date of production under the conditions of packaging, transportation and storage in accordance with this standard. If it is overdue, it should be re-inspected to see if it meets the requirements of this standard.3 Determine the number of sampling units according to the provisions of GB/T6678. When sampling, insert the sampler obliquely from the top of the packaging bag to one-fourth of the depth of the material layer to take samples. After mixing the collected samples, reduce them to no less than 500g according to the quartering method, and pack them in two clean and dry plastic bottles and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, batch number, shelf life, sampling date and name of the sampler. One bottle is used for inspection and the other bottle is kept for three months for future reference.
5.4 Feed-grade magnesium 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 magnesium sulfate shipped from the factory meets the requirements of this standard. 5.5 The user has the right to inspect and accept the received feed-grade magnesium sulfate in accordance with the provisions of this standard. The inspection time shall be within one month after the arrival of the goods.
5.6 If any index of the inspection result does not meet the requirements of this standard, the sample shall be taken from the twice amount of packaging for re-inspection. If even one index of the re-inspection result does not meet the requirements of this standard, the whole batch of products shall be unqualified. 116
6 Marking and labeling
HG 2933 --2000
6.1 Feed grade magnesium sulfate should be packaged with firm and clear markings, including: manufacturer name, factory address, product name, trademark, shelf life, "simple material grade sample", net content, batch number or production date and this standard number. 6.2 Each batch of feed grade magnesium sulfate shipped should be accompanied by firm and clear markings printed in accordance with the requirements of GB10648. 7 Packaging, transportation and storage
7.1 The inner packaging of feed grade magnesium sulfate adopts polyethylene plastic film bags with a thickness of not less than 0.05mm. The outer packaging adopts plastic woven bags with a net content of 25kg per bag.
The inner bag is tied twice with nylon rope, or with the same Other equivalent sealing methods. 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 and the stitch lengths are even. There are no leaks or skipped stitches.
7.2 During transportation, feed-grade magnesium sulfate should be covered to prevent rain and moisture. It should be handled with care and is prohibited from being transported together with toxic substances. 7.3 Feed-grade magnesium sulfate should be stored in a cool and dry place, avoid open-air storage, and is prohibited from being mixed with toxic substances. The product has a shelf life of six months from the date of production under the conditions of packaging, transportation and storage in accordance with this standard. If it is overdue, it should be re-inspected to see if it meets the requirements of this standard.3 Determine the number of sampling units according to the provisions of GB/T6678. When sampling, insert the sampler obliquely from the top of the packaging bag to one-fourth of the depth of the material layer to take samples. After mixing the collected samples, reduce them to no less than 500g according to the quartering method, and pack them in two clean and dry plastic bottles and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, batch number, shelf life, sampling date and name of the sampler. One bottle is used for inspection and the other bottle is kept for three months for future reference.
5.4 Feed-grade magnesium 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 magnesium sulfate shipped from the factory meets the requirements of this standard. 5.5 The user has the right to inspect and accept the received feed-grade magnesium sulfate in accordance with the provisions of this standard. The inspection time shall be within one month after the arrival of the goods.
5.6 If any index of the inspection result does not meet the requirements of this standard, the sample shall be taken from the twice amount of packaging for re-inspection. If even one index of the re-inspection result does not meet the requirements of this standard, the whole batch of products shall be unqualified. 116
6 Marking and labeling
HG 2933 --2000
6.1 Feed grade magnesium sulfate should be packaged with firm and clear markings, including: manufacturer name, factory address, product name, trademark, shelf life, "simple material grade sample", net content, batch number or production date and this standard number. 6.2 Each batch of feed grade magnesium sulfate shipped should be accompanied by firm and clear markings printed in accordance with the requirements of GB10648. 7 Packaging, transportation and storage
7.1 The inner packaging of feed grade magnesium sulfate adopts polyethylene plastic film bags with a thickness of not less than 0.05mm. The outer packaging adopts plastic woven bags with a net content of 25kg per bag.
The inner bag is tied twice with nylon rope, or with the same Other equivalent sealing methods. 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 and the stitch lengths are even. There are no leaks or skipped stitches.
7.2 During transportation, feed-grade magnesium sulfate should be covered to prevent rain and moisture. It should be handled with care and is prohibited from being transported together with toxic substances. 7.3 Feed-grade magnesium sulfate should be stored in a cool and dry place, avoid open-air storage, and is prohibited from being mixed with toxic substances. The product has a shelf life of six months from the date of production under the conditions of packaging, transportation and storage in accordance with this standard. If it is overdue, it should be re-inspected to see if it meets the requirements of this standard.
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