Active standard | Published: 01/11/1984

ISO 6635:1984

Fruits, vegetables and derived products — Determination of nitrite and nitrate content — Molecular absorption spectrometric method
(Fruits, légumes et produits dérivés — Détermination de la teneur en nitrite et en nitrate — Méthode photométrique d´absorption moléculaire)

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Detail information

Designation: ISO 6635:1984

Publication date: 01/11/1984

Pages: 4

Country: International technical standard

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Anotation

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.

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