HG 2934-2000 English PDF (HG2934-2000)

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HG 2934-2000: Feed grade zinc sulphate
HG 2934-2000
HG
CHEMICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Filing No.: 7474-2000
Replacing HG 2934-1987
Feed grade zinc sulphate
饲料级硫酸锌
ISSUED ON: JUNE 05, 2000
IMPLEMENTED ON: MARCH 01, 2001
Issued by: State Bureau of Petroleum and Chemical Industry
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Categories ... 6
4 Requirements ... 6
5 Test method ... 6
6 Inspection rules ... 16
7 Signs, labels ... 16
8 Packaging, transportation, storage ... 16
Appendix A (Informative) Treatment of waste liquid containing potassium cyanide . 18
Feed grade zinc sulphate
1 Scope
This standard specifies the requirements, test methods, inspection rules, signs, labels,
packaging, transportation, storage of feed grade zinc sulfate.
This standard applies to feed grade zinc sulfate, which is produced by reacting zinc-
containing raw materials with sulfuric acid. This product is used as a zinc supplement
in the feed, after pretreatment.
Molecular formula: ZnSO4 • H2O
Relative molecular mass: 179.47 (according to the international relative atomic mass in
1997)
Molecular formula: ZnSO4 • 7H2O
Relative molecular mass: 287.56 (according to the international relative atomic mass in
1997)
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. The versions indicated at the time of publication of this
standard are valid. All standards are subjected to revision, AND parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable.
GB/T 601-1988 Chemical reagent - Preparations of standard volumetric solutions
GB/T 602-1988 Chemical reagent - Preparations of stock standard solutions
GB/T 603-1988 Chemical reagent - Preparations of reagent solutions for use in test
methods
GB/T 6678-1986 General principles for sampling chemical products
GB/T 6682-1992 Water for laboratory use - Specifications (neq ISO 3696:1987)
GB/T 8450-1987 Determination method of arsenic in food additives (arsenic spot
method)
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: 250 g/L.
5.1.1.4 Dithizone carbon tetrachloride solution: 1 + 100.
5.1.1.5 Barium chloride solution: 50 g/L.
5.1.2 Identification method
5.1.2.1 Identification of zinc ions
Weigh 0.2 g of specimen. Dissolve it in 5 mL water. Pipette 1 mL of the test solution.
Use acetic acid solution to adjust the pH of the solution to 4 ~ 5. Add 2 drops of sodium
sulfate solution. Add few drops of disulfiram carbon tetrachloride solution and 1 mL of
chloroform. After shaking, the organic layer shows purple red.
5.1.2.2 Identification of sulfate ion
Dissolve the specimen in water. Add barium chloride solution, to produce a white
precipitate, which is insoluble in hydrochloric acid solution.
5.2 Determination of zinc sulfate content and zinc content
5.2.1 Method summary
Dissolve zinc sulfate in sulfuric acid solution. Add appropriate amount of water. Add
ammonium fluoride solution, thiourea, ascorbic acid, as masking agent. Use acetic acid-
sodium acetate solution, to adjust pH value to 5 ~ 6. Use xylenol orange as indicator.
Titrate with disodium ethylenediaminetetraacetic acid standard titration solution, until
the solution turns from purple red to bright yellow, which is the end point.
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/L.
5.2.2.4 Ammonium fluoride solution: 200 g/L.
5.2.2.5 Sulfuric acid solution: 1 + 1.
5.2.2.6 Acetic acid-sodium acetate buffer solution: pH = 5.5.
5.2.5 Tolerance
Take the arithmetic mean of the parallel determination results, as the measurement
result. The absolute difference of parallel determination results: zinc sulfate
monohydrate and zinc sulfate heptahydrate is not more than 0.2%, zinc (Zn) is not more
than 0.15%.
5.3 Determination of arsenic content
5.3.1 Method summary
In acidic medium, potassium iodide and stannous chloride will reduce As (V) to As (III);
generate arsenic spot with nascent hydrogen on the mercury bromide. It is compared
with the standard arsenic spot.
5.3.2 Reagents and materials
5.3.2.1 Hydrochloric acid.
5.3.2.2 Potassium carbide.
5.3.2.3 Arsenic-free metal zinc.
5.3.2.4 Stannous chloride solution: 400 g/L.
5.3.2.5 Arsenic standard solution: 1 mL solution contains 0.001 mg of As.
Preparation: Use a pipette to pipette 1.00 mL of arsenic standard solution, which is
prepared according to GB/T 602. Place it in a 100 mL volumetric flask. Use water to
dilute it to the mark. Shake well. This solution is prepared before use.
5.3.2.6 Mercury bromide test paper.
5.3.2.7 Lead acetate cotton.
5.3.3 Instruments and equipment
Arsenic fixer.
5.3.4 Analytical procedures
Weigh (1.0 ± 0.01) g of specimen. Place it in the jar of the arsenic fixer. Add a small
amount of water to moisten it. Add 6 mL of hydrochloric acid, to dissolve the specimen.
Use water to dilute it to 70 mL. Add 1 g of potassium iodide and 0.2 mL of stannous
chloride solution. Shake well. Let it stand for 10 min. Add 2.5 g of arsenic-free metal
zinc. Immediately plug the arsenic measuring tube, which was pre-installed with lead
acetate cotton and mercury bromide test paper. Place it in a dark place, at 25 ~ 30 °C
for 1 ~ 1.5 h. The brown-yellow color of the mercury bromide test paper shall not be
deeper than the color spots, which are produced by the standard.
The standard is to use a pipette to pipette 5 mL of arsenic standard solution. Place it in
the jar of the arsenic fixer. Use water to dilute it to 70 mL. Add 6 mL of hydrochloric
acid. The following operations are performed at the same time and method as the
specimen.
5.4 Determination of lead content
5.4.1 Atomic absorption spectrophotometry (arbitration method)
5.4.1.1 Method summary
In the dilute nitric acid medium, at the wavelength of 283.3 nm of the atomic absorption
spectrophotometer, use the air-acetylene flame, to make measurement, through the
standard addition method.
5.4.1.2 Reagents and materials
a) Nitric acid solution: 1 + 1.
b) Lead standard solution: 1 mL of the solution contains 0.01 mg of Pb, which is
prepared before use.
Preparation: Use a pipette to pipette 10 mL of lead standard solution, which was
prepared according to GB/T 602. Place it in a 100 mL volumetric flask. Use water to
dilute it to the mark. Shake well.
5.4.1.3 Instruments and equipment
a) Atomic absorption spectrophotometer.
b) Lead hollow cathode lamps.
5.4.1.4 Instrument working conditions
a) Wavelength: 283.3 nm.
b) Flame: Air - Acetylene.
5.4.1.5 Analytical procedures
Weigh about 30 g of the specimen (accurate to 0.01 g). Dissolve it in 50 mL of water.
Add 5 mL of nitric acid solution. Transfer it into a 250 mL volumetric flask, after
dissolving. Use water to dilute it to the mark. Shake well.
Use a pipette to pipette 25 mL of the test solution into four 100 mL volumetric flasks.
Then use pipette to add 0, 10 mL, 20 mL, 30 mL of lead standard solution. Use water
b) Ammonium citrate solution: 400 g/L.
c) Ammonia-ammonium chloride buffer solution (A): pH = 10.
d) Potassium cyanide solution: 150 g/L.
e) Dithizone-chloroform solution: 0.02 g/L.
Preparation: Dissolve 0.02 g of dithi...