Fruits, vegetables and derived products — Determination of nitrite and nitrate content — Molecular absorption spectrometric method
NORM herausgegeben am 1.11.1984
Bezeichnung normen: ISO 6635:1984
Ausgabedatum normen: 1.11.1984
Zahl der Seiten: 4
Gewicht ca.: 12 g (0.03 Pfund)
Land: Internationale technische Norm
Kategorie: Technische Normen ISO
Description / Abstract: The method consists in extracting a test portion with hot water, precipitating the protein by addition of solutions of potassium hexacyanoferrate(II) and zinc acetate, and filtrating the precipitate. Further, reduction of the nitrate to nitrite by metallic cadmium (only for determining the nitrate). Then addition of sulfanilamide chloride and N-(1-naphtyl)ethylenediamine and measurement of the red complex obtained at a wavelength of 538 nm.