ISO 6491-1998 PDF

Full title and description

ISO 6491:1998 — Animal feeding stuffs — Determination of phosphorus content — Spectrometric method. This International Standard specifies a spectrometric procedure for measuring the phosphorus content of animal feeding stuffs, intended particularly for materials with relatively low phosphorus concentrations.

Abstract

The standard describes a laboratory spectrometric (spectrophotometric/colorimetric) method for determining total phosphorus in animal feeds up to about 50 g/kg. It is intended for routine quality-control and regulatory testing where phosphorus is present at low to moderate levels; for very high phosphorus concentrations a gravimetric method is recommended.

General information

• Status: Published (current published edition).
• Publication date: 17 December 1998.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 65.120 — Animal feeding stuffs.
• Edition / version: Edition 2 (1998).
• Number of pages: 7 pages.

Scope

Specifies a spectrometric method for the determination of phosphorus content in animal feeding stuffs. The method is applicable to feeds with phosphorus less than about 50 g/kg and is especially suitable for products with low phosphorus content; for samples with higher phosphorus content application of a gravimetric method (for example using quinoline phosphomolybdate) is advised. Normative references used by the method include standards for sample preparation and laboratory water quality.

Key topics and requirements

• Target analyte: total phosphorus in animal feeding stuffs.
• Analytical technique: spectrometric / spectrophotometric measurement following appropriate sample digestion and preparation.
• Applicable range: optimized for phosphorus contents below 50 g/kg; alternate gravimetric methods recommended for higher concentrations.
• Normative references and prerequisites: correct sample preparation (see ISO 6498 series) and use of laboratory-grade water (ISO 3696) for reagents and dilutions.
• Intended performance context: routine feed-analysis laboratories and quality control — requirements include appropriate calibration, use of blanks/controls, and adherence to laboratory QA practices.

Typical use and users

Used by feed-testing laboratories, feed manufacturers, agricultural testing services, regulatory bodies and research laboratories performing quality-control or compositional analyses of animal feeding stuffs. Typical applications include product specification checks, regulatory compliance testing, nutritional formulation verification and inter-laboratory comparisons.

Related standards

Commonly used alongside other ISO feed/animal-stuffs standards in ICS 65.120 such as ISO 6498 (preparation of test samples / sample preparation guidelines), ISO 6496 (moisture and volatile matter determinations), ISO 6497 (sampling) and ISO 3696 (water for analytical laboratory use). These documents provide the sampling, sample-preparation and reagent/water-quality context required to apply ISO 6491 correctly.

Keywords

phosphorus; animal feeding stuffs; feed analysis; spectrometric; spectrophotometric; phosphorus determination; ISO 6491; sample preparation; laboratory method; feed quality.

FAQ

Q: What is this standard?

A: ISO 6491:1998 is an International Standard that specifies a spectrometric method for determining the phosphorus content of animal feeding stuffs.

Q: What does it cover?

A: It covers the laboratory procedure (sample digestion/preparation and spectrometric measurement) for quantifying total phosphorus in feed materials, applicable principally to samples with phosphorus below about 50 g/kg; for higher concentrations, gravimetric alternatives are recommended.

Q: Who typically uses it?

A: Feed testing laboratories, feed manufacturers, agricultural quality-control and regulatory laboratories, and research institutions analyzing feed composition and nutrient content.

Q: Is it current or superseded?

A: ISO 6491:1998 is the second edition (published 17 December 1998) and replaced the 1980 edition; as published by ISO it remains the operative published edition. Users should check with their national standards body or ISO for any more recent revisions or confirmations before use.

Q: Is it part of a series?

A: Yes — it is part of the ISO feed/animal-stuffs family (ICS 65.120). It is normally used together with companion standards for sampling and sample preparation (for example ISO 6497, ISO 6496, ISO 6498) and other analytical methods in the series.

Q: What are the key keywords?

A: Phosphorus, feed analysis, spectrometric, spectrophotometric, animal feeding stuffs, ISO 6491, sample preparation, laboratory method.