|Determination of organic nitrogen in natural waters by means of an ammonia probe|
|Mertens, J.; Van Den Winkel, P.; Massart, D.L. (1975). Determination of organic nitrogen in natural waters by means of an ammonia probe. Int. J. Environ. Anal. Chem. 4: 25-31|
|In: International journal of environmental and analytical chemistry. Taylor & Francis: London. ISSN 0306-7319, more|
|Also published as |
- Mertens, J.; Van Den Winkel, P.; Massart, D.L. (1976). Determination of organic nitrogen in natural waters by means of an ammonia probe, in: (1976). IZWO Coll. Rep. 6(1976). IZWO Collected Reprints, 6: pp. chapter 16 [Subsequent publication], more
Marine; Brackish water; Fresh water
The use of an ammonia probe for the determination of total nitrogen in river and sea water is described. The ammonia is directly determined in the diluted destruction mixture, so that the time-consuming distillation procedure is avoided. Destruction procedure, which mainly differ in the nature of the used catalyst, were compared.
The procedure of Gibs and Moum yielded the best results and was adapted for the low nitrogen content waters.
The difficulties encountered when adapting the method and the probe characteristics are reported. The accuracy of the method was checked by comparing it with a well-established titration method and with a colorimetric method. The final procedure allows good precision and accuracy. The limit for precise measurements is around 0.5 ppm N, so that for sea water the method is not universally applicable.