GB/T 20413-2017 in English
VALIDSingle superphosphate
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
本标准规定了过磷酸钙的术语和定义、要求、试验方法、检验规则、标示、包装、运输和贮存。
本标准适用于工业过磷酸钙处理磷矿粉制成的农业用疏松状和粒状过磷酸钙产品。
Introduction
GB/T 20413—2017 Superphosphate Standard Overview
GB/T 20413—2017 Superphosphate is the national standard of the People's Republic of China, applicable to loose and granular superphosphate products for agricultural use made from phosphate rock powder treated with industrial sulfuric acid. This standard replaces the previous GB/T 20413—2006, adds requirements and determination methods for water-soluble phosphorus and sulfur, and refines the regulations on product labeling and packaging.
Main revisions
- Increase in testing requirements for water-soluble phosphorus and sulfur: The mass fraction/% of water-soluble phosphorus and the mass fraction/% of sulfur are added, and the corresponding determination methods are provided.
- Limits of heavy metals and hazardous substances: Added limit requirements and determination methods for arsenic, cadmium, lead, chromium, and mercury, and clarified the detection standards for volatile organic compounds and trichloroacetaldehyde.
- Detailed labeling and packaging regulations: More detailed regulations on product labeling, packaging materials, and net content ranges to ensure product quality and market norms.
Quality requirements of superphosphate
| Items | Loose superior quality | Granular superior quality | Requirements for other grades |
|---|---|---|---|
| Mass fraction of available phosphorus (as P2O5)/% | 18.0 | 18.0 | ≥12.0 |
| Mass fraction of water-soluble phosphorus (as P2O5)/% | - | - | ≥7.0 |
| Mass fraction of sulfur (in terms of S)/% | 8.0 | 8.0 | - |
| Mass fraction of free acid (in terms of P2O5)/% | 5.5 | 5.5 | ≤5.5 |
Comparison of test methods with standards
Determination of available phosphorus and water-soluble phosphorus: The quinoline phosphomolybdic acid weight method (arbitration method) or the automatic analyzer method (GB/T 22923) is used. Accurate measurements are performed using laboratory equipment such as a constant temperature drying oven, glass sand crucible, etc. to ensure that the results meet the standard requirements.
Determination of sulfur content: Use the combustion method or plasma emission spectrometry (NY/T 1117—2010) to ensure the accuracy and reliability of the determination.
Implementation suggestions and precautions
- Strict quality control: Production enterprises should establish a complete testing system to ensure that each batch of products meets the technical requirements of GB/T 20413—2017.
- Strengthen labeling management: Strictly label product information in accordance with the standards, including available phosphorus, water-soluble phosphorus, sulfur content and product grade.
- Optimize packaging and storage: Select packaging materials that comply with GB/T 8569 to ensure that the product is not damp, sun-proof, or cracked during transportation and storage.
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