ISO 5993:1979
Sodium hydroxide for industrial use; Determination of mercury content; Flameless atomic absorption spectrometric method
- Standard No.
- ISO 5993:1979
- Release Date
- 1979
- Published By
- International Organization for Standardization (ISO)
- Latest
- ISO 5993:1979
- 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.
ISO 5993:1979 history
- 1979 ISO 5993:1979 Sodium hydroxide for industrial use; Determination of mercury content; Flameless atomic absorption spectrometric method
