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SRPS ISO 2174:1993

Surface active agents — Preparation of water with known calcium hardness

Aug 4, 1993
Aug 4, 1993

General information

90.20     Apr 15, 2026

90.60    Sep 2, 2026

ISS

H091

International Standard

71.100.40  

Serbian  

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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

NOW

PUBLISHED
SRPS ISO 2174:1993
90.20 Standard under periodical review
Apr 15, 2026

Related project

Adopted from ISO 2174:1990

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