ISO 986:1976
$12.35
Sodium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) complexometric method
| Published By | Publication Date | Number of Pages |
| ISO | 1976-05 | 5 |
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 986-1969.
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