prEN 17764

Inorganic Fertilizers — Determination of the concentration of free, chelated or complexed micronutrients and the chelating and/or complexing agents

Scope

This document specifies the method for the determination of free, chelated or complexed micronutrients and chelating and/or complexing agents present in compound inorganic micronutrient fertilizers.
This method applies to compound micronutrient fertilizers when micronutrients are chelated and/or complexed.
The method is based on the determination of the following specific parameters:
— the water-soluble micronutrient concentration;
— the fraction of chelated micronutrients in relation;
— identification of chelating agents EDTA, DTPA, HEEDTA, IDHA, [S,S]–EDDS, [o,o] EDDHA, [o,o] EDDHMA, [o,p] EDDHA, HBED and EDDHSA;
— the fraction of complexed micronutrients;
— identification of complexing agents (lignosulfonates, heptagluconic acid (HGA)).
The method is based on
— ICP (inductive coupled plasma) or FAAS (flame atomic absorption spectrometry) measurement of the concentration of water-soluble micronutrients according to EN 16963 or EN 16965 after extraction according to EN 16962;
— LC (liquid chromatography) measurement of the chelating agents according to EN 15950, EN 13368 1, EN 13368 2, EN 13368 3, EN 15451, EN 15452;
and/or complexing agents according to prEN 16109:2026 and prEN 16847:2026;
— determination of the concentration of chelated micronutrients by prEN 13366-1 and/or prEN 13366-2:2026;
— determination of the complexed micronutrients by prEN 15962:2026.
To avoid duplication of the analytical methods, prEN 17764:2026 describes the determination of micronutrients and the identification and determination of chelating agents.

Related legislation

Legislation related to this standard