ISO 3704:1976

Sulphur for industrial use — Determination of acidity — Titrimetric method

Publication date: Sep 1, 1976

General information

Current stage: 90.93 Effective date: Jul 19, 2019

Originator: ISO

Owner: ISO/TC 47

Type: International Standard

ICS: 71.060.10

Languages: French English

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Status: Published

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Scope

Applicable to products having acidities, expressed as H2 SO4 , equal to or more than 0.01 % (m/m). Describes the extraction of acidic substances with a mixture of water and propan-2-ol (isopropyl alcohol). Titration of the extract with standard volumetric sodium hydroxide solution in the presence of phenolphthalein as indicator. The preparation of the sample from the laboratory sample is carried out by grinding a sufficient quantity of the undried material until it passes through a sieve of nominal mesh of 250 m.

Life cycle

NOW

PUBLISHED
ISO 3704:1976
90.93 Standard confirmed
Jul 19, 2019

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