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ISO 6635:1984

Current Revision

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

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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.


SDO ISO: International Organization for Standardization
Document Number ISO 6635
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 34/SC 3
Publish Date Document Id Type View
Not Available ISO 6635:1984 Revision