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ISO 2174:1990

Surface active agents -- Preparation of water with known calcium hardness
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ISO 2174:1990

Surface active agents -- Preparation of water with known calcium hardness

PUBLISH DATE 1990
ISO 2174:1990

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.

SDO ISO: International Organization for Standardization
Document Number ISO 2174
Publication Date April 15, 1990
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 91
Publish Date Document Id Type View
April 15, 1990 ISO 2174:1990 Revision