ISO-6635 › Fruits, vegetables and derived products -- Determination of nitrite and nitrate content -- Molecular absorption spectrometric method

ISO-6635 - 1ST EDITION - CURRENT


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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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Document Number

ISO 6635:1984

Revision Level

1ST EDITION

Status

Current

Publication Date

Nov. 1, 1984

Committee Number

ISO TC 34/SC 3