ISO 2174:1990 (R2021)
Active , Confirmed Standard
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ISO 2174:1990 (R2021)

Surface active agents — Preparation of water with known calcium hardness

Summary

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.

Notes

90.93 : Norme internationale confirmée

Technical characteristics

Publisher International Organization for Standardization (ISO)
Publication Date 04/05/1990
Confirmation Date 06/26/2021
Edition 3
Page Count 4
EAN ---
ISBN ---
Weight (in grams) ---
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