Објављен
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.
ОБЈАВЉЕН
ISO 5993:1979
90.93
Одлука о потврђивању стандарда
20. 10. 2023.
Natrijum-hidroksid za industrijsku upotrebu — Određivanje sadržaja žive — Besplamena atomska apsorpciona spektrometrijska metoda
90.93 Одлука о потврђивању стандарда
Natrijum-hidroksid za industrijsku upotrebu - Određivanje sadržaja žive - Metoda atomske apsorpcije bez plamena
95.99 Повучен