本国际标准规定了总有机氮的测定方法，以及任何 氨态氮，通过凯氏定氮法存在于摄影处理废物中。 照相处理废物中的凯氏氮总量可在10 mg/l至200 mg/l范围内测定 氨，或氮含量在8 mg/l至160 mg/l范围内。如果氨态氮（见ISO 6853）是 单独测定并减去，可确定有机氨基氮的浓度。

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.