SSH ISO 6635:1984

Fruta, perime dhe produkte që rrjedhin prej tyre - Përcaktimi i përmbajtjes së nitriteve dhe nitrateve - Metoda spektrometrike e përthithjes molekulare

Fruits, vegetables and derived products — Determination of nitrite and nitrate content — Molecular absorption spectrometric method

Scope

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.