Nitrogen in nature

Hedges, J. I. and Lee, C. (1993). Measurement of dissolved organic carbon and nitrogen in natural waters. Mar. Chem. 41, 290pp. 

Koroleff F (1969) Determination of total nitrogen in natural waters by means of digestion. International Council for the Exploration of the Sea, Hydrography Committee, CM/C 8, p 4... 

Figure 2.8. N Is XANES spectra of (a) fulvic acid isolated from a glucose-glycine-8-Mn02 system and (b) the lyophilized solid phase. The peaks are assigned to pyridinic (398.6eV), pyridone (400.7 eV), amide (401.3 eV), and pyrrolic (402.0 eV) moieties. Reprinted from Jokic, A., Schulten, H.-R., Cutler, J. N., et al. (2004). A significant abiotic pathway for the formation of unknown nitrogen in nature. Geophys. Res. Lett. 31, L05502, with permission from the American Geophysical Union.

Jokic, A., Schulten, H.-R., Cutler, J. N., Schnitzer, M., and Huang P. M. (2004a). A significant abiotic pathway for the formation of unknown nitrogen in nature. Geophys. Res. Lett. 31, L05502. 

Soldrzano, L., and Sharp, J. H. (1980a). Determination of total dissolved nitrogen in natural waters. Limnol. Oceanogr. 25,751-754. 

Rossi, G. and M. Savarese. 1997. On-line determination of total nitrogen in natural sea water samples by alkaline persulphate oxidation. Mar. Pollut. Bull. 35 174—175. 

Zielinski, E. Chromatographic determination of helium, argon and nitrogen in natural gases. Chem. Anal. 8, 399 (1963). - Chem. Abstr. 60, 2320 (1964). 

Most of the organic nitrogen in natural waters is bound to or built into structural components of humic substances (Bronk, 2002 Schnitzer, 1985). It has been demonstrated both in laboratory experiments and in field observations that proteinaceous matter bound to humic substances becomes bioresistant (Carlson et al., 1985 Hubberten et al., 1994). In pioneering studies on DON phototransformation Amador et al. (1989, 1991) showed that a significant part of amino acids associated with humic matter becomes bioavailable after irradiation. On the other hand, longterm irradiation of a mixture of protein and DOM compounds resulted in decreased bioavailability (Keil and Kirchman, 1994). The loss of bioavadabihty of the protein required presence of DOM, supporting that the DOM either interacted direcdy... 

Preston, T., Bury, S., McMeekin, B., and Slater, C. (1996a). Isotope dilution analysis of combined nitrogen in natural waters. II. Amino acids. Rapid Commun. Mass Spectrom. 10, 965—968. 

I.D. McKelvie, M. Mitri, B.T. Hart, L.C. Hamilton, A.D. Stuart, Analysis of total dissolved nitrogen in natural waters by on-line photooxidation and flow injection, Anal. Chim. Acta 293 (1994) 155. 

Littke, R., Krcx3ss, B., Idiz, E. Frielingsdorf, j. 1995. Molecular nitrogen in natural gas accumulations Generation from sedimentary organic matter at high temperatures. American Association of Petroleum Geologists Bulletin, 79, 410-430. 

Fig. 3.33. The vertical distribution of various forms of nitrogen in natural sediments (Lii et al., 2004)...

The concentrations of all forms of nitrogen in sediments varied with the sediments texture. Generally, fine-grained components directly affect the form, content, and distribution of nitrogen in natural sediments. The distributions of 4 exchangeable nitrogen forms in different components of sediments were listed in Table 3.23. It was noticeable that the concentrations of 4 exchangeable... 

Boussingault, Jean Baptiste Joseph Dieudonne (1802-1887) French agricultural chemist professor in Lyon and Paris who contributes much to understanding of nitrogen in nature. 

Organic Carbon and Nitrogen in Natural Waters (Seattle 1991) in order to critically evaluate the methodological procedures that essentially bear upon generating consistent results In this workshop, natural seawater samples were distributed to 34 participants prior to the workshop for analysis to allow an intercalibration exercise to be performed. Poor comparability between laboratory analyses was apparent and values were within the mean values +40% RSD, although HTCO was confirmed as a more effective method than WCO. The inconsistencies were largely attributed to difficulties in the system blank correction. 

Marine Chemistry (1993) vol. 41, Special Issue containing reports from the HSF-NOAA-DOE sponsored Workshop on Measurements of Dissolved Organic Carbon and Nitrogen in Natural Waters. 

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