# ISO 6739:1988 — Withdrawn and superseded ISO standards

For ISO 6739:1988, item title is Whey cheese — Determination of nitrate and nitrite contents — Method by cadmium reduction and spectrometry; status code is 9599; successor is ISO 14673-3:2001 | ISO 14673-1:2001 | ISO 14673-2:2001; withdrawn / published date is 1988-08-25, recorded from its source on 2026-08-05.

- **Identifier:** ISO 6739:1988 _(verified: appears in the quote below)_
- **Item title:** Whey cheese — Determination of nitrate and nitrite contents — Method by cadmium reduction and spectrometry _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 14673-3:2001 | ISO 14673-1:2001 | ISO 14673-2:2001
- **Withdrawn / published date:** 1988-08-25 _(verified: appears in the quote below)_

## What the source says

> 13196,IS,,ISO 6739:1988,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,1988-08-25,2,['67.100.30'],ISO/TC 34/SC 5,9599,[13195],"[31423,31421,31422]","['en','fr']",6,"<p>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.</p>"

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).