ISO 997:1976
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Potassium hydroxide for industrial use Determination of calcium content EDTA (disodium salt) complexometric method
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02-27-2019
English, French
05-01-1976
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 glyoxal-bis-(2-hydroxyanil) as indicator, after elimination of impurities which may hinder the determination. - Replaces ISO Recommendation R 997-1969.
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