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Homepage>ISO 6635:1984-Fruits, vegetables and derived products — Determination of nitrite and nitrate content — Molecular absorption spectrometric method
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sklademVydáno: 1984
ISO 6635:1984-Fruits, vegetables and derived products — Determination of nitrite and nitrate content — Molecular absorption spectrometric method

ISO 6635:1984

ISO 6635:1984-Fruits, vegetables and derived products — Determination of nitrite and nitrate content — Molecular absorption spectrometric method

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Označení normy:ISO 6635:1984
Počet stran:4
Vydání:1
Vydáno:1984
DESCRIPTION

ISO 6635:1984


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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