ISO 2174:1990

Surface active agents — Preparation of water with known calcium hardness

Publication date: Apr 5, 1990

General information

Current stage: 90.93 Effective date: Jun 26, 2021

Originator: ISO

Owner: ISO/TC 91

Type: International Standard

ICS: 71.100.40

Languages: French English

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Status: Published

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Scope

A stock solution is prepared by dissolving an appropriate quantity of calcium chloride in water. The calcium content of this stock solution is determined by complexometric titration with the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA) using a mixture of Mordant Black 11 (C.I. 14645) and methyl red as indicator. Dilute solutions of the hardness required are prepared by dilution of appropriate volumes of the stock solution.

Life cycle

PREVIOUSLY

Revises
ISO 2174:1979

NOW

PUBLISHED
ISO 2174:1990
90.93 Standard confirmed
Jun 26, 2021

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