ISO 6490-1-1985 PDF

Full title and description

Animal feeding stuffs — Determination of calcium content — Part 1: Titrimetric method. This international standard specifies a titrimetric analytical procedure for determining calcium in animal feed materials with calcium contents greater than 1 g/kg.

Abstract

The method consists of ashing a test portion, treating the ash with hydrochloric acid, precipitating the calcium as calcium oxalate, dissolving the precipitate in sulfuric acid and titrating the oxalic acid formed with a standard volumetric potassium permanganate solution. The procedure is intended for feedstuffs having calcium contents above 1 g/kg.

General information

• Status: Published (International Standard; confirmed on periodic review).
• Publication date: November 1985 (Edition 1, 1985-11).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 65.120 — Animal feeding stuffs.
• Edition / version: Edition 1 (1985).
• Number of pages: 2.

Core bibliographic and status details as listed by ISO.

Scope

This part of ISO 6490 specifies a titrimetric method for the determination of the calcium content of animal feeding stuffs. It is applicable to all animal feeding stuffs having calcium contents greater than 1 g/kg and describes sample ashing, chemical treatment and permanganate titration steps required to quantify calcium by converting it to oxalate and back-titrating the oxalate.

Key topics and requirements

• Applicability threshold: suitable for feed samples with calcium > 1 g/kg.
• Sample preparation: ashing of test portion and treatment of ash with hydrochloric acid.
• Precipitation: calcium precipitated as calcium oxalate.
• Dissolution and titration: dissolution of precipitate in sulfuric acid and titration of formed oxalic acid with standard potassium permanganate solution.
• Required reagents and apparatus: fuming acids, standard KMnO4 volumetric solution, filtration/precipitation equipment and accurate weighing/ashing facilities.
• Accuracy considerations: designed for routine laboratory and QC use; follow prescribed sample sizes and end-point criteria for reproducible results.

These procedural and applicability points follow the method description and normative details provided in the standard.

Typical use and users

Used by analytical and quality-control laboratories in the feed and animal nutrition sector, feed manufacturers, regulatory and inspection bodies, research institutions and certification agencies that test calcium content in feedstuffs for compliance, formulation and nutritional labeling. Laboratories adopt this method when a classical titrimetric determination is preferred or where equipment for instrumental techniques is not available.

Related standards

Normative and related references include ISO 6490-2 (Animal feeding stuffs — Determination of calcium content — Part 2: Atomic absorption spectrometric method), and related ISO standards on sampling and sample preparation for animal feeding stuffs (for example ISO 6497 and ISO 6498). These documents are typically referenced for alternative analytical techniques and for sampling/preparation guidance.

Keywords

animal feeding stuffs; calcium determination; titrimetric method; calcium oxalate precipitation; potassium permanganate titration; ash preparation; ISO 6490-1; feed analysis.

FAQ

Q: What is this standard?

A: ISO 6490-1:1985 is an international standard that specifies a titrimetric method for determining calcium content in animal feeding stuffs.

Q: What does it cover?

A: It covers sample ashing, chemical treatment to precipitate calcium as calcium oxalate, dissolution and titration of the oxalate (via permanganate titration) and the calculation principles for samples with calcium > 1 g/kg.

Q: Who typically uses it?

A: Feed testing laboratories, feed manufacturers, regulatory bodies, research labs and other organizations performing routine calcium analysis on animal feeds.

Q: Is it current or superseded?

A: The ISO record shows ISO 6490-1:1985 as published and periodically confirmed; the version from 1985 is recorded as confirmed on review cycles (most recently confirmed in 2021 per ISO lifecycle information). Users should check with national bodies or ISO for the very latest status before relying on it for regulatory compliance.

Q: Is it part of a series?

A: Yes — it is Part 1 of ISO 6490. Part 2 (ISO 6490-2) specifies an atomic absorption spectrometric method for calcium determination; related ISO standards address sampling and sample preparation for animal feeding stuffs.

Q: What are the key keywords?

A: Animal feeding stuffs, calcium, titrimetric method, calcium oxalate, potassium permanganate, ash, feed analysis, ISO 6490-1.