ISO 6635:1984
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Fruits, légumes et produits dérivés — Détermination de la teneur en nitrite et en nitrate — Méthode photométrique d’absorption moléculaire
| Published By | Publication Date | Number of Pages |
| ISO | 1984-11 | 8 |
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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