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ISO 5993:1979

Sodium hydroxide for industrial use — Determination of mercury content — Flameless atomic absorption spectrometric method

Sep 1, 1979

General information

90.93     Oct 20, 2023

ISO

ISO/TC 47

International Standard

71.060.40  

French   English  

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Scope

Covers a method applicable to liquid or solid products having mercury contents greater than 0,02 mg/kg. The principle of determination is based on oxidation of the mercury contained in a test portion to mercury(II) ions by potassium permanganate in the presence of sulphuric acid, reduction of the excess oxidant by hydroxylammonium chloride, reduction of the mercury(II) ions to mercury by tin(II) chloride, entrainment of the mercury in air or nitrogen, passage of the gaseous mixture through a measuring cell, and measurement of the absorption at a wavelength of 253,7 nm.

Life cycle

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PUBLISHED
ISO 5993:1979
90.93 Standard confirmed
Oct 20, 2023