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ISO 6851:2001

ISO 6851:2001

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

Published By Publication Date Number of Pages
ISO 2001-12 18
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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.

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ISO 6851:2001
$19.50