ISO 2479-1972 PDF

Full title and description

St ISO 2479-1972 — "Sodium chloride for industrial use — Determination of matter insoluble in water or in acid and preparation of principal solutions for other determinations". This International Standard specifies a gravimetric procedure to determine the matter insoluble in water or in acid in industrial-grade sodium chloride and describes preparation of the principal (main) solutions used for subsequent determinations.

Abstract

The standard defines the conditions for characterizing insoluble matter of interest to users (not an exhaustive impurity profile). The method covers dissolution of a test portion in water (or in acid where required), filtration of the insoluble residue, drying and weighing of that residue, and dilution of the filtrate to form the main solution for other analyses. The procedure is concise and intended for routine quality control of sodium chloride for industrial use.

General information

• Status: Published (International Standard; record shows it has been subject to periodic review/confirmation).
• Publication date: December 1972 (1972-12).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.060.50 (Salts / Sodium chloride for industrial use).
• Edition / version: Edition 1 (ISO 2479:1972).
• Number of pages: 3 pages (short procedural standard).

Scope

This standard applies to sodium chloride intended for industrial use. It specifies a method to determine the fraction of a sample that is insoluble in water or in a specified acid medium and gives instructions for preparing the principal solutions (main solutions) that will be used for performing further chemical determinations on the same sample. The method is intended for routine laboratory quality control rather than exhaustive impurity characterization.

Key topics and requirements

• Definition of "matter insoluble" under specified aqueous and acidic conditions.
• Procedure: dissolution of a test portion, filtration of insoluble residue, drying and gravimetric determination (weighing) of residue.
• Preparation of the principal (main) solution from the filtrate for subsequent determinations (e.g., halogens, sulfate, calcium/magnesium analyses that reference this main solution).
• Practical focus on reproducible laboratory technique suitable for industrial QC labs.

Typical use and users

Used by quality-control laboratories at salt production and processing facilities, chemical manufacturers who use industrial sodium chloride as a raw material, testing laboratories performing compliance or specification checks, and standards organizations referencing preparatory procedures for further salt analyses. Technical staff performing routine gravimetric analyses and preparing main solutions for follow-up titrations or gravimetric tests are the typical users.

Related standards

Several ISO standards dealing with sodium chloride analytical methods are related; these include ISO 2480 (Determination of sulphate content — barium sulphate gravimetric method), ISO 2481 (Determination of halogens, expressed as chlorine — mercurimetric method), and ISO 2482 (Determination of calcium and magnesium contents — EDTA complexometric methods). ISO 2479 is referenced as the method to prepare the principal solution used in those determinations.

Keywords

sodium chloride; industrial salt; insoluble matter; gravimetric determination; main solution; sample preparation; ISO 2479:1972.

FAQ

Q: What is this standard?

A: ISO 2479:1972 is an International Standard that specifies how to determine the matter insoluble in water or in acid in sodium chloride for industrial use and how to prepare the principal solutions for subsequent determinations.

Q: What does it cover?

A: It covers the definition of insoluble matter under the stated test conditions, a gravimetric procedure (dissolve, filter, dry, weigh) to measure that insoluble fraction, and procedures to prepare the main solution from the filtrate for other tests.

Q: Who typically uses it?

A: Quality-control and analytical chemistry personnel in salt production, chemical processing, and testing laboratories that analyze industrial sodium chloride. Standards bodies and laboratories performing subsequent analyses that use the main solution also rely on it.

Q: Is it current or superseded?

A: The document was published in December 1972. ISO's metadata indicates the standard has been subject to periodic review and has been recorded as confirmed in past systematic reviews; users should consult ISO or their national standards body for the absolute current status before relying on it for regulatory purposes.

Q: Is it part of a series?

A: It is part of a set of ISO methods for sodium chloride for industrial use; related standards include ISO 2480, ISO 2481 and ISO 2482, which specify determinations for sulphate, halogens and calcium/magnesium respectively and reference the main-solution preparation described in ISO 2479.

Q: What are the key keywords?

A: Sodium chloride, industrial salt, insoluble matter, gravimetric method, filtration, main solution, ISO 2479:1972.