International Standard
ISO 2174:1990
Surface active agents — Preparation of water with known calcium hardness
Reference number
ISO 2174:1990
ISO 2174:1990
Edición 3
1990-04
1990-04
© ISO 2024
International Standard
p
ISO 2174:1990
6972
No disponible en español
Publicado
(Edición 3, 1990)
Esta norma se revisó y confirmó por última vez en 2021.
Por lo tanto, esta versión es la actual.
Resumen
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.
Ciclo de vida
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Anteriormente
RetiradaISO 2174:1979
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Ahora
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