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GB/T 26568-2011 English PDF (GBT26568-2011)

GB/T 26568-2011 English PDF (GBT26568-2011)

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GB/T 26568-2011: Magnesium sulfate for agricultural use

This Standard specifies the requirements, test methods, inspection rules, marks, packaging, transport and storage of magnesium sulfate for agricultural use.
GB/T 26568-2011
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 65.080
G 21
Magnesium sulfate for agricultural use
ISSUED ON. JUNE 16, 2011
IMPLEMENTED ON. JULY 15, 2011
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification ... 5
4 Requirements ... 5
5 Test methods ... 6
6 Inspection rules ... 10
7 Marks ... 12
8 Packaging, transport and storage ... 12
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of National Technical Committee on Fertilizers and Soil Conditioning Agents of Standardization Administration of China (SAC/TC 105).
The drafting organization of this Standard. Yingkou Magnesite Chemical (Group) Co., Ltd.
Main drafters of this Standard. Zhang Rongyang, Che Tailong, Wang Yunxing, Wang Junzi, Tian Hengjie, Zhang Cuiling, Zhao Yong, Yang Jun.
Magnesium sulfate for agricultural use
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marks, packaging, transport and storage of magnesium sulfate for agricultural use. This Standard is applicable to magnesium sulfate for agricultural use.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 534 Industrial sulfuric acid
GB/T 6003.1-1997 Test sieves of metal wire cloth
GB/T 6679 General rules for sampling solid chemical products
GB/T 8170-2008 Rules of rounding off for numerical values and expression
and judgement of limiting values
GB 8569 Packing of solid chemical fertilizers
GB/T 8576 Determination of free water for compound fertilizers - Vacuum oven method
GB 18382 Fertilizer marking - Presentation and declaration
GB/T 19203-2003 Determination of calcium, magnesium and sulphur
content for compound fertilizer
GB 20406-2006 Potassium sulfate for agricultural use
GB/T 20937-2007 Potassium magnesium of sulphate fertilizer
GB/T 23349 Ecological index of arsenic cadmium lead chromium and
mercury for fertilizers
HG/T 2843 Chemical fertilizer Products-standard volumetric, standard,
reagent and indicator solutions for chemical analysis
4.2 Ecological indicator requirements
The implementation shall be in accordance with the provisions of GB/T 23349. 4.3 Requirements for raw material sulfuric acid
If it uses sulfuric acid as raw material, it shall comply with requirements of GB/T 534.
5 Test methods
Reagents, preparations of water and solutions used in this Standard, in the absence of specifications and preparation methods, it shall be in accordance with HG/T 2843.
5.1 Determination of water-soluble magnesium content - Disodium
ethylenediaminetetraacetic acid volumetric method
5.1.1 Method summary
Cover iron and aluminum ions with triethanolamine; cover calcium ion with EGTA; titrate magnesium ion with EDTA complex.
5.1.2 Reagents and solutions
5.1.2.1 Disodium edetate (EDTA) standard titration solution. c(EDTA)=0.01 mol/L.
5.1.2.2 Triethanolamine solution. 1+4.
5.1.2.3 Potassium hydroxide solution. 200 g / L.
5.1.2.4 Ethylene glycol diethyl ether diamine tetraacetic acid (EGTA) solution. 2.5 g / L.
Weigh 2.5 g of EGTA into a 400 mL beaker. Add 100 mL of water. Add potassium hydroxide solution in drops till the solution is clear and transparent. Use water to dilute to 1 L.
5.1.2.5 Ammonia-ammonium chloride buffer solution (pH = 10).
5.1.2.6 Acid chrome blue K-naphthol green B mixed indicator (referred to as K-B indicator).
5.1.3 Apparatus
General laboratory instruments.
Carry out according to the provisions of 5.7 in GB 20937-2007.
5.6 Determination of granularity - Screening method
Use the testing sieves of which the pore diameters are 2.0 mm, 4.00 mm in R 40/3 series of GB/T 6003.1-1997. The rest shall be performed in accordance with the provisions of 4.6 in GB/T 20406-2006.
5.7 Determination of pH value - Acidity meter method
5.7.1 Principle
Add water into sample. Dissolve it at room temperature. Use pH meter to determine.
5.7.2 Reagents and solutions
5.7.2.1 Phosphate standard buffer solution. c(KH2PO4) = 0.025 mol/L,
c(Na2HPO4) = 0.025 mol/L; when it is at 25??C, pH value shall be 6.86.
5.7.2.2 Borate standard buffer solution. c(Na2B4O7) = 0.01 mol/L; when it is at 25??C, pH value shall be 9.18.
5.7.3 Apparatus
5.7.3.1 General laboratory instruments;
5.7.3.2 pH meter. sensitivity is 0.01 pH units.
5.7.4 Determination
5.7.4.1 Determination of magnesium sulfate monohydrate (powder) or
magnesium sulfate monohydrate (granular)
Weigh 10 g of magnesium sulfate monohydrate sample in 6.4.2 into a 100 mL beaker. Add 50 mL of water without carbon dioxide. Intermittently stir it. Dissolve it at room temperature for 150 min. Immediately use pH meter to determine. Before determination, use standard buffer solution to verify the pH meter. 5.7.4.2 Determination of magnesium sulfate heptahydrate
Weigh 10 g of magnesium sulfate heptahydrate sample in 6.4.2 into a 100 mL beaker. Add 50 mL of water without carbon dioxide. Intermittently stir it. Dissolve it at room temperature for 30 min. Immediately use pH meter to determine. Before determination, use standard buffer solution to verify the pH meter. 5.7.5 Expression of analysis results
Take the arithmetic mean value of parallel measurement results of two samples

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