GB/T 20784-2018Potassium nitrate for agricultural use (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 20784-2013 "potassium nitrate for agriculture". The main technical changes compared with GB/T 20784-2013 are as follows.

--- Adjusted product technical indicators according to domestic agricultural demand and product quality level (see 3.2, 3.2 of 2013 edition);

--- Increased instrumental analysis of potassium oxide (see 4.3.2);

--- Increased temperature titration of potassium oxide (see 4.3.3);

--- Increased instrumental analysis of total nitrogen (see 4.4.2);

--- Increased water insoluble test method (see 4.7);

--- Increased test methods for the content of harmful elements (arsenic, cadmium, lead, chromium, mercury) (see 4.9).

1 Scope

This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of potassium nitrate for agriculture.

This standard is applicable to solid potassium nitrate products for agricultural use used as nitrogen and potassium binary compound fertilizers produced by various processes.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB 190-2009 dangerous goods packaging mark

GB/T 1918-2011 Industrial Potassium Nitrate

GB/T 2441.1 Determination of urea - Part 1. General nitrogen content

GB/T 6679 Solid Chemical Products Sampling General

GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values

GB/T 8569 solid chemical fertilizer packaging

GB 18382 Fertilizer identification content and requirements

GB/T 22923 Determination of nitrogen, phosphorus and potassium in fertilizers by automatic analyzer

GB/T 23349 Fertilizers arsenic, cadmium, lead, chromium, mercury ecological indicators

Determination of Chloride Ion Content in GB/T 24890 Compound Fertilizer

Determination of particle size of GB/T 24891 compound fertilizer

HG/T 2843 chemical fertilizer products commonly used in standard titration solutions, standard solutions, reagent solutions and indicator solutions

Determination of nitrate nitrogen, ammonium nitrogen and amide nitrogen in NY/T 1116 fertilizer

3 Requirements

3.1 Appearance. white or light colored crystals or granules, no visible (mechanical) impurities.

3.2 Agricultural potassium nitrate products should meet the requirements of Table 1, and should also meet the indicated values.