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>ISO Standards>ISO 997:1976-Potassium hydroxide for industrial use-Determination of calcium content-EDTA (disodium salt) complexometric method
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immediate downloadReleased: 1976
ISO 997:1976-Potassium hydroxide for industrial use-Determination of calcium content-EDTA (disodium salt) complexometric method

ISO 997:1976

Potassium hydroxide for industrial use

CURRENCY
42 EUR
Standard´s number:ISO 997:1976
Pages:3
Edition:1
Released:1976
Language:English
DESCRIPTION

ISO 997:1976


The method is applicable to products having a calcium content equal to or greater than 0.002 % (m/m). The principle consists in titration of the calcium with a standard volumetric solution of the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA disodium salt) in the presence of 2,2'-(ethylenedinitrilo)diphenol Äglyoxal-bis-(2-hydroxyanil)Ü as indicator, after elimination of impurities which may hinder the determination. - Replaces ISO Recommendation R 997-1969.
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