Reference number
ISO 6851:2001
ISO 6851:2001
© ISO 2025
International Standard
ISO 6851:2001
Photography — Processing waste — Determination of total amino nitrogen (microdiffusion Kjeldahl method)
Edition 2
2001-12
2001-12
ISO 6851:2001
32493
Publiée
(Edition 2, 2001)
Cette publication a été révisée et confirmée pour la dernière fois en 2021.
Cette édition reste donc d’actualité.
Résumé
This International Standard specifies a method for the determination of the total organic nitrogen, as well as any
ammoniacal nitrogen, present in photographic processing wastes by the Kjeldahl method.
Total Kjeldahl nitrogen can be determined in photographic processing wastes in the range of 10 mg/l to 200 mg/l as
ammonia, or in the range of 8 mg/l to 160 mg/l in terms of nitrogen. If ammoniacal nitrogen (see ISO 6853) is
determined separately and subtracted, the concentration of organic amino nitrogen can be established.
Cycle de vie
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Précédemment
AnnuléeISO 6851:1987
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Actuellement