ISO 15959:2016 PDF

Name: ISO 15959:2016 — Fertilizers — Determination of extracted phosphorus
SKU: ISO 15959:2016
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Fertilizers — Determination of extracted phosphorus

Название (английский):

ISO 15959:2016

Fertilizers — Determination of extracted phosphorus

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 14 июля 2016 г.
Издание:: ISO IS 15959 edition 1 version 1
ICS:: 65.080

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Описание (английский):

ISO 15959:2016 specifies a method for the determination of phosphorus in fertilizer extracts. The method is applicable to all extracts of fertilizers for the determination of the different forms of phosphorus as phosphorus soluble in mineral acids, water soluble phosphorus, phosphorus soluble in solutions of ammonium citrate, phosphorus soluble in 2 % citric acid and phosphorus soluble in 2 % formic acid.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 15959:2016 - Fertilizers - Determination of extracted phosphorus - defines a standardized wet‑chemical procedure for measuring phosphorus in fertilizer extracts. The method covers multiple extract types including phosphorus soluble in mineral acids, water‑soluble phosphorus, phosphorus soluble in ammonium citrate, 2 % citric acid, and 2 % formic acid. The principle is precipitation of phosphorus as quinoline phosphomolybdate, followed by drying (250 ± 10 °C) and gravimetric weighing to calculate phosphorus content.

Key Topics and Requirements

Scope: Applies to all common fertilizer extracts for different phosphorus fractions (acid‑soluble, water‑soluble, citrate‑soluble, citric/formic acid‑soluble).

Analytical principle: Acidify aliquot (nitric acid), hydrolyse polyphosphates if present (reflux/boil, typically ~1 h), precipitate with a molybdate/quinoline reagent, filter, wash, dry at 250 °C and weigh the precipitate.

Reagents & apparatus: Uses sodium or ammonium molybdate‑based precipitating reagents prepared with quinoline and nitric/citric acid; standard lab glassware, sintered funnels or filter crucibles (5–20 µm porosity) and an oven regulated to 250 °C.

Quality control: Includes blank tests, verification against a potassium dihydrogen phosphate standard, and guidance on sample aliquots/dilution factors.

Calculations: Mass fraction of P (or P2O5) is calculated from the corrected mass of quinoline phosphomolybdate using provided conversion factors or custom dilution/portion formulas.

Precision & validation: Interlaboratory testing (2008) supports method precision with repeatability and reproducibility limits calculated per ISO 5725‑2.

Applications

Quality control and production: Routine testing of fertilizer products to quantify available and extractable phosphorus fractions for batch release and formulation control.

Regulatory compliance and labeling: Generating standardized phosphorus results for declarations and conformity with fertilizer regulations.

Laboratory accreditation & method harmonization: Used by chemical testing laboratories to demonstrate adherence to an international, validated procedure.

Research and agronomy: Comparative studies on phosphorus availability, solubility and fertilizer performance in product development or soil amendment research.

Related Standards (applicable)

ISO 14820‑2 - Sampling and sample preparation for fertilizers

EN 12944‑1 / EN 12944‑2 - Vocabulary related to fertilizers and soil improvers

EN/ISO extraction standards referenced for specific extract procedures (EN 15956, EN 15957, EN 15958)

Keywords: ISO 15959:2016, fertilizers, determination of extracted phosphorus, phosphorus analysis, quinoline phosphomolybdate, fertilizer extracts, analytical method, precision, repeatability, reproducibility.

ISO 15959:2016 PDF

Abstract

Похожие стандарты

Overview

Key Topics and Requirements

Applications

Who uses this standard?

Related Standards (applicable)

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