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Standard´s number: | ISO 3091:1975 |
Pages: | 5 |
Edition: | 1 |
Released: | 1975 |
Pages (English): | 5 |
Pages (French): | 5 |
DESCRIPTION
ISO 3091:1975
The method consists in extracting of a test portion with hot water, precipitating of proteins and filtrating. Reduction of the extracted nitrates into nitrites by metallic cadmium. Formation of a red colouration by adding of sulfanilamide and nphthyl ethylenediamine hydrochloride and photometric measurement at a wavelength of 538 nm.