90.20 Jul 15, 2023
ISO/TC 34/SC 6
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.
90.20 Standard under periodical review
Jul 15, 2023
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