ISO 2270:1989-ed.2.0..
ISO 2271:1989-ed.2.0..
ISO 2272:1989-ed.2.0..
ISO 2456:1986
ISO 2868:1973
ISO 2869:1973
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ISO 2174:1990-ed.3.0
Surface active agents — Preparation of water with known calcium hardness
Automatically translated name:
Surface active agents -- Preparation of water with known calcium hardness
STANDARD published on 5.4.1990
The information about the standard:
Designation standards: ISO 2174:1990-ed.3.0
Publication date standards: 5.4.1990
SKU: NS-429126
The number of pages: 4
Approximate weight : 12 g (0.03 lbs)
Country: International technical standard
Category: Technical standards ISO
The category - similar standards:
Annotation of standard text ISO 2174:1990-ed.3.0 :
Description / Abstract: 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.
Similar standards:
17.8.1989
12.10.1989
29.6.1989
13.11.1986
1.12.1973
1.12.1973
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