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.