ISO 2174:1990

Surface active agents — Preparation of water with known calcium hardness

Publication date: 5 pri 1990

General information

Current stage: 90.93 Effective date: 26 qer 2021

Originator: ISO

Owner: ISO/TC 91

Type: International Standard

ICS: 71.100.40

Gjuha: frëngjisht anglisht

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Statusi: Publikuar

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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.

ISO 2174:1990

Surface active agents — Preparation of water with known calcium hardness

General information

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