ISO 6740:1985Withdrawn

Dried whey — Determination of nitrate and nitrite contents — Method by cadmium reduction and spectrometry

Lactosérum en poudre — Détermination des teneurs en nitrates et en nitrites — Méthode par réduction au cadmium et spectrométrie

Abstract / scope

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.

Life cycle

Replaced by

ISO 14673-1:2001WithdrawnMilk and milk products — Determination of nitrate and nitrite contents — Part 1: Method using cadmium reduction and spectrometryInternational Standard · Published 1 Nov 2001 · ISO/TC 34/SC 5 ISO 14673-2:2001WithdrawnMilk and milk products — Determination of nitrate and nitrite contents — Part 2: Method using segmented flow analysis (Routine method)International Standard · Published 1 Nov 2001 · ISO/TC 34/SC 5 ISO 14673-3:2001WithdrawnMilk and milk products — Determination of nitrate and nitrite contents — Part 3: Method using cadmium reduction and flow injection analysis with in-line dialysis (Routine method)International Standard · Published 1 Nov 2001 · ISO/TC 34/SC 5