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ISO 997:1976 PDF
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Potassium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) complexometric method
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)ü as indicator, after elimination of impurities which may hinder the determination. – Replaces ISO Recommendation R 997-1969.
| Edition | 1976 |
|---|---|
| Published Date | 1976 |
| Published By | International Standardization Organisation |
| Page Count | 3 |
