ISO 22018:2021 PDF

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

Название (английский):

ISO 22018:2021

Fertilizers, soil conditioners and beneficial substances — Determination of EDTA soluble phosphorus content in inorganic fertilizers

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 7 июля 2021 г.
Издание:: ISO IS 22018 edition 1 version 1
ICS:: 65.080

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Описание (английский):

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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 22018:2021 specifies a standardized laboratory method for determining EDTA soluble phosphorus in inorganic fertilizers. The procedure targets fertilizers made from or blended with phosphate sources such as superphosphate, ammonium phosphate, triple superphosphate and nitrophosphate. It is explicitly not suitable for fertilizers containing calcium magnesium phosphates. The method uses EDTA extraction followed by a gravimetric determination of phosphorus as quinolinium molybdophosphate and reports results as a mass fraction percentage of P2O5.

Key topics and requirements

Extraction principle: EDTA disodium salt (0.1 mol/L, 37.5 g/L) is used to extract EDTA-soluble phosphorus; orthophosphate in the extract reacts with quimociac reagent to form a yellow quinolinium molybdophosphate precipitate.

Gravimetric determination: Precipitate is isolated on a glass filter crucible, dried (oven ~180 °C), cooled and weighed to calculate EDTA soluble P (expressed as P2O5).

Representative test steps:

Sample preparation per ISO 8358 and ISO 14820-2.
Extraction at controlled temperature (thermostatic water bath oscillator ~60 °C for 1 h) with a defined EDTA volume.
Acidification and reaction with quimociac reagent, precipitation, filtration, washing, drying and weighing.
Blank test and parallel determinations for accuracy.

Precision metrics: repeatability limit r = 0.25 (mass fraction percentage); reproducibility limit R = 0.50 (mass fraction percentage). A ring test (interlaboratory study) supports precision data.

Reporting: Test reports must identify the sample, reference ISO 22018:2021, include results, sampling/analysis dates, and note whether repeatability requirements are met.

Applications and practical value

Quality control in fertilizer production to verify the soluble phosphorus fraction accessible via EDTA extraction.

Product specification and compliance testing for inorganic phosphate fertilizer blends (excluding calcium magnesium phosphate products).

Independent testing laboratories and accreditation bodies use the method to provide traceable, comparable results across labs.

R&D and formulation teams assessing how different phosphate sources contribute to EDTA-soluble phosphorus in compound fertilizers.

Helps agronomists and regulatory agencies evaluate phosphorus availability characteristics relevant to nutrient management and labeling.

Related standards

ISO 8157 - Fertilizers and soil conditioners: Vocabulary

ISO 8358 - Solid fertilizers: Preparation of samples for analysis

ISO 14820-2 - Fertilizers and liming materials: Sampling and sample preparation (Part 2)

ISO 5725-2 - Accuracy (trueness and precision): Repeatability and reproducibility methods

Keywords: ISO 22018:2021, EDTA soluble phosphorus, inorganic fertilizers, determination method, quinolinium molybdophosphate, fertilizer testing, sample preparation, repeatability, reproducibility.

ISO 22018:2021 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and practical value

Who should use this standard

Related standards

Технические детали

ISO 8358:1991

Solid fertilizers — Preparation of samples for chemical and physical analysis

ISO 14820-2:2016

Fertilizers and liming materials — Sampling and sample preparation — Part 2: Sample preparation

ISO 8157:1984

Fertilizers and soil conditioners — Vocabulary

SIST ISO 5725-2:2020

Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determina…