Reference number
ISO 997:1976
ISO 997:1976
© ISO 2024
ISO 997:1976
Potassium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) complexometric method
Edition 1
1976-05
1976-05
Retirada
Resumen
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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