Dissolved organic N

We can identify three pathways that could remove N from terrestrial ecosystems, even though it limits NPP therein. These are loss of dissolved organic N (DON), loss of N trace gases by transformation-dependent pathways, and losses of N as a consequence of temporal or spatial heterogeneity in the supply versus demand for available N within ecosystems. 

Fig. 2.5 Timeseries of daily phytoplankton, zooplankton, dissolved organic carbon, detritus, and phosphorus concentration, and photosyntesis over one model year at two location the shelf seas of the Pacific Ocean, 170 E 65 N and 140 E 10 S.

Welsh, P.G., J.F. Skidmore, D.J. Spry, D.G. Dixon, P.V. Hodson, N.J. Hutchinson, and B.E. Hickie. 1993. Effect of pH and dissolved organic carbon on the toxicity of copper to larval fathead minnow (Pimephales promelas) in natural lake waters of low alkalinity. Canad. Jour. Fish. Aquat. Sci. 50 1356-1362. 

Bury, N.R., F. Galvez, and C.M. Wood. 1999a. Effects of chloride, calcium, and dissolved organic carbon on silver toxicity comparison between rainbow trout and fathead minnows. Environ. Toxicol. Chem. 18 56-62. 

Liu, N. Hui, J. Sun, C. Dong, J. Zhang, L. Xiao, H., Nanoporous zeolite thin film based fiber intrinsic Fabry Perot interferometric sensor for detection of dissolved organics in water, Sensors 2006, 6, 835 847... 

Meima, J. A., van Zommeren, A. Comans, R. N. J. 1999. Complexation of Cu with dissolved organic carbon in municipal solid waste incinerator bottom ash leachates. Environmental Science Technology, 33, 1424-1429. 

Di-(2-ethylhexyl)phosphoric acid ( diisooctyl phosphate) [272I5-I0-7] [298-07-7] M 322.4. Contaminants of commercial samples include the monoester, polyphosphates, pyrophosphate, 2-ethylhexanol and metal impurities. Dissolved in n-hexane to give an 0.8M soln. Washed with an equal volume of M HNO3, then with saturated (NH4)2CO3 soln, with 3M HNO3, and twice with water [Petrow and Allen AC 33 1303 1961], Similarly, the impure sodium salt, after scrubbing with pet ether, has been acidified with HCl and the free organic acid has been extracted into pet ether and purified as above. For purification via the copper salt see McDowell et al. [JINC 38 2127 1976]. 

---