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Homepage>ISO 2174:1990-Surface active agents — Preparation of water with known calcium hardness
sklademVydáno: 1990
ISO 2174:1990-Surface active agents — Preparation of water with known calcium hardness

ISO 2174:1990

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

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Označení normy:ISO 2174:1990
Počet stran:4
Vydání:3
Vydáno:1990
DESCRIPTION

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.
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