ISO 6739:1988Withdrawn

Whey cheese — Determination of nitrate and nitrite contents — Method by cadmium reduction and spectrometry

Fromage de sérum — Détermination des teneurs en nitrates et en nitrites — Méthode par réduction au cadmium et spectrométrie

Abstract / scope

Is suitable for all kinds of whey cheese. The principle of determination consists in extracting the whey cheese with 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 apparatus for nitrate reduction is shown in a figure.

Life cycle

Replaces

ISO 6739:1982WithdrawnWhey cheese — Determination of nitrate and nitrite contents — Method by cadmium reduction and photometryInternational Standard · Published 1 Dec 1982 · ISO/TC 34/SC 5

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