ISO 6740:1985
Dried whey — Determination of nitrate and nitrite contents — Method by cadmium reduction and spectrometry
The principle of determination consists in dissolving the dried whey in warm water, precipitating the fat and proteins, filtering and reducing the nitrate in a portion of the filtrate to nitrite by means of copperized cadmium. The sampling shall be made as specified in ISO 707. A figure shows the apparatus for nitrate reduction.
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