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ISO 6851:2001

Photography — Processing waste — Determination of total amino nitrogen (microdiffusion Kjeldahl method)

Dec 20, 2001

General information

90.93     Jun 5, 2021

ISO

ISO/TC 42

International Standard

37.040.30     13.030.30  

English  

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 6851:1987

NOW

PUBLISHED
ISO 6851:2001
90.93 Standard confirmed
Jun 5, 2021