ISO 22018:2021 PDF

Scope: This document specifies the method for the determination of the EDTA soluble phosphorus content of inorganic fertilizers. The method is applicable for fertilizers composed of or blended from multiple sources such as superphosphate, ammonium phosphate, triple superphosphate, and/or nitrophosphate. It is not suitable for fertilizers containing calcium magnesium phosphates.

ISO 22018:2021 Referenced Document

ISO 14820-2 Fertilizers and liming materials - Sampling and sample preparation - Part 2: Sample preparation
ISO 5725-2 Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 8157 Fertilizers, soil conditioners and beneficial substances — Vocabulary*， 2022-09-30 Update
ISO 8358 Solid fertilizers; preparation of samples for chemical and physical analysis

2021 ISO 22018:2021 Fertilizers, soil conditioners and beneficial substances - Determination of EDTA soluble phosphorus content in inorganic fertilizers