ISO 2362-1972 PDF

Full title and description

ISO 2362:1972 — Aluminium fluoride for industrial use — Determination of fluorine content — Modified Willard‑Winter method. This International Standard specifies a wet‑chemical procedure for measuring fluorine in industrial aluminium fluoride samples using fusion, acid distillation and titration (with an optional spectrophotometric end‑point).

Abstract

The method involves fusion of a test portion with sodium carbonate, separation of fluorine by distillation with sulphuric acid and determination by titration with thorium nitrate using sodium alizarinsulphonate–methylene blue as the indicator. As an alternative, the thorium nitrate titration may be performed using sodium alizarinsulphonate alone and the end‑point determined spectrophotometrically at about 525 nm.

General information

• Status: Withdrawn (withdrawal processed by ISO).
• Publication date: December 1972 (first edition published 1 December 1972).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.060.50.
• Edition / version: Edition 1 (1972).
• Number of pages: 5.

Key bibliographic and lifecycle information above is taken from the ISO record for this standard (ISO 2362:1972).

Scope

This standard applies to the determination of fluorine content in aluminium fluoride intended for industrial use. It defines sample preparation (fusion), the separation step (acid distillation) and the quantitative determination by thorium nitrate titration with specific indicator systems, including a spectrophotometric alternative for end‑point detection. The procedure is intended for quality control and chemical analysis of commercial grades of aluminium fluoride, where the method chemistry and detection limits are appropriate for the product.

Key topics and requirements

• Sample fusion with sodium carbonate to liberate fluorine from the matrix.
• Separation of fluorine by distillation using sulphuric acid.
• Titration of the evolved/collected fluoride as a thorium complex using thorium nitrate.
• Indicator systems: sodium alizarinsulphonate–methylene blue; alternative use of sodium alizarinsulphonate with spectrophotometric end‑point at ~525 nm.
• Laboratory apparatus and reagent specifications, and procedural steps to ensure reproducible results (as typical for ISO chemical test methods).
• Note: the standard has been withdrawn; users should verify whether a newer, authoritative method applies to their regulatory or quality requirements.

Typical use and users

Analytical and quality control laboratories at aluminium fluoride producers, buyers and end‑users (for example in aluminium smelting and refractory industries), independent testing laboratories and national standards bodies. Typical applications include incoming raw‑material inspection, production quality checks and conformity testing where fluorine content is a critical specification.

Related standards

ISO 2362:1972 is part of a group of ISO methods addressing chemical analysis of aluminium fluoride for industrial use; closely related documents published in the same period include ISO 2368:1972 (determination of iron content — 1,10‑phenanthroline photometric method) and ISO 2369:1972 (determination of silica content — spectrophotometric method using the reduced silicomolybdic complex). These companion standards share the same ICS classification and technical committee origin.

Keywords

aluminium fluoride, fluorine determination, Willard‑Winter method, thorium titration, sodium alizarinsulphonate, spectrophotometry, chemical analysis, industrial salts, ISO 2362

FAQ

Q: What is this standard?

A: ISO 2362:1972 is an International Standard that specified a laboratory method (modified Willard‑Winter) for determining the fluorine content of aluminium fluoride destined for industrial use.

Q: What does it cover?

A: It covers sample fusion, separation of fluorine by distillation with sulphuric acid and quantitative determination by titration with thorium nitrate using specified indicator systems; it also describes an optional spectrophotometric end‑point at about 525 nm.

Q: Who typically uses it?

A: Laboratories in manufacturers and purchasers of aluminium fluoride, independent test houses and technical committees involved in raw‑material and process control for aluminium production and related industries.

Q: Is it current or superseded?

A: ISO 2362:1972 has been withdrawn. Users should consult their national standards body or ISO catalogue for any replacement or more recent methods for fluorine determination in aluminium fluoride; the ISO bibliographic record indicates withdrawal actions in the 1990s–2002 lifecycle.

Q: Is it part of a series?

A: Yes — it was issued alongside related ISO methods for aluminium fluoride (for example ISO 2368:1972 for iron and ISO 2369:1972 for silica), all developed by ISO/TC 47 and classified under ICS 71.060.50.

Q: What are the key keywords?

A: Aluminium fluoride, fluorine, Willard‑Winter, thorium titration, sodium alizarinsulphonate, spectrophotometric end‑point, ISO 2362, industrial salts.