Dried milk -- Determination of nitrate and nitrite contents -- Method by cadmium reduction and photometry
Describes a method suitable for whole, partly skimmed and skimmed milk powder. The principle of determination consists in dissolving the dried milk in water, precipitating the fat and proteins, filtering and reducing the nitrate to nitrite in a portion of the filtrate by means of copperized cadmium. The sampling shall be made as specified in ISO 707. The apparatus for nitrate reduction is shown in a figure.