ISO 2479:1972

Name: 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
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Sodium chloride for industrial use — Determination of matter insoluble in water or in acid and preparation of principal solutions for other determinations

Название (английский):

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

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 3
Дата публикации:: 1 декабря 1972 г.
Издание:: ISO IS 2479 edition 1 version 1
ICS:: 71.060.50

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Описание (английский):

Insoluble substances shall be defined by the conditions described in this document. The object is not to dissolve all the impurities but only those of interest to users. The method is applicable to the analysis, carried out inaqueous medium or in acid medium. The principle consists in solution of the test portion in water, filtration, drying and weighing of the insoluble residue. Dilution of the filtrate to form the main solution for carrying out other determinations.

Abstract

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Другие стандарты ISO

Overview

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" defines a laboratory method to quantify insoluble matter in industrial sodium chloride. The standard specifies test conditions (aqueous or acidic media) that deliberately define which impurities are considered "insoluble" for industrial use - it does not aim to dissolve every impurity, only those relevant to users. The procedure combines solution, filtration, gravimetric drying/weighing of the residue and preparation of main filtrate solutions for subsequent determinations.

Key topics and requirements

Scope and principle

Determines insoluble matter after dissolving a measured test portion in water or in acid, filtering, drying and weighing the residue.
Produces a primary solution (Solution A for water-based tests; Solution B for acid-based tests) from the filtrate for other analyses (e.g., chloride, alkalinity).

Apparatus

Filter crucible (glass or porcelain) with P10–P16 porosity (pore size ~4–16 µm).
Laboratory oven adjustable to 110 ± 2 °C, desiccator with drying agent, and common glassware.

Reagents and controls

Distilled or equivalent purity water.
Silver nitrate solution (approx. 5 g/L AgNO3 in nitric acid) for chloride checks during washing.
In acid procedure: titrated hydrochloric acid and sodium hydroxide, methyl orange indicator.

Procedure highlights

Typical test portion ~100 g (weighed to 0.01 g); filtrate volumes and wash series specified.
Repeated washing of residue and verification of absence of chloride in final wash (checked with AgNO3).
Dry crucible and residue at 110 °C, cool in desiccator and weigh (precision down to 0.1 mg for crucible/residue).
Use of filtration aid (kieselguhr) recommended if very fine insolubles clog the filter.

Results

Insoluble matter reported as mass percentage. The standard prescribes how to prepare and store primary solutions for downstream assays.

Applications and users

ISO 2479 is practical for:

Quality control laboratories at salt producers and processors.

Industrial users of technical-grade sodium chloride (chemical plants, water treatment, de-icing material suppliers) who require defined limits on insolubles.

Testing laboratories performing routine compositional analysis, specification compliance, or incoming material inspection.

Regulatory or standards bodies defining industrial salt specifications.

Keywords: ISO 2479, sodium chloride for industrial use, insoluble matter determination, gravimetric analysis, sample preparation, filtration, filtration crucible, sodium chloride quality control.

ISO 2479:1972

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

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