ISO 3197:1975

Withdrawn

Sodium hydroxide for industrial use — Determination of chlorides content — Photometric method

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Withdrawn date

04-18-2019

Language(s)

English, French

Published date

03-01-1975

Publisher

International Organization for Standardization

Applicable to products having contents, expressed as chlorine, between 2 mg/kg and 50 mg/kg. For contents exceeding 50 mg/kg the method specified in ISO 981 shall be used. The principle consists in the quantitative displacement of the thiocyanate ions of the mercury(II) thiocyanate by the cloride ions contained in the test portion. Reaction of the thiocyanate ions with iron(III) nitrate to form iron(III) thiocyanate (red). Photometric measurement of the colour at a wavelength of about 450 nm.

DevelopmentNote	Also numbered as BS 6075-7(1981) (09/2005)
DocumentType	Standard
Pages	3
PublisherName	International Organization for Standardization
Status	Withdrawn

Standards	Relationship
NBN T 03 131 : 1980	Identical
NFT 20 430 : 76 FD	Identical
UNE 55602:1978	Identical

BS 6075-11:1981	Methods of sampling and test for sodium hydroxide for industrial use Determination of mercury content (flameless atomic absorption method)
BS 6075-8:1981	Methods of sampling and test for sodium hydroxide for industrial use Determination of sulphate content
BS 6075-9:1981	Methods of sampling and test for sodium hydroxide for industrial use Determination of calcium and magnesium contents
BS 6075-10:1981	Methods of sampling and test for sodium hydroxide for industrial use Determination of mercury content (photometric method)