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sklademVydáno: 2002-01-18
BS ISO 6851:2001
Photography. Processing waste. Determination of total amino nitrogen (microdiffusion Kjeldahl method)
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| Označení normy: | BS ISO 6851:2001 |
| Počet stran: | 20 |
| Vydáno: | 2002-01-18 |
| ISBN: | 0 580 37508 0 |
| Status: | Standard |
Popis
BS ISO 6851:2001
This standard BS ISO 6851:2001 Photography. Processing waste. Determination of total amino nitrogen (microdiffusion Kjeldahl method) is classified in these ICS categories:
- 13.030.30 Special wastes
- 37.040.30 Photographic chemicals
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.