Dissolved organic matter humic substances

Keywords Dissolved organic matter Humic substances Organic pollutants Photo-induced transformation Reactive species... 

Benner, R. H. 1998. Cycling of dissolved organic matter in the ocean. In Aquatic Humic Substances (D. O. Hessen and L. J. Tranvik, Eds.), pp. 317—331. Springer-Verlag, Berlin. 

Thomas, J. D. 1997. The role of dissolved organic matter, particularly free amino acids and humic substances, in freshwater ecosystems. Freshwater Biology 38 1—36. 

For decades in aquatic ecology, the apparent chemical recalcitrance of humic substances that dominated the instantaneous bulk DOC of standing and running waters led to the belief that these compounds were poorly used by microbiota. To be sure, loss rates are slow, but consistently in the range of 0.5-2% per day under many different environmental conditions (Fig. 2). Often rates of degradation of total dissolved organic matter are greater than 2% per day. 

Direction 6. Less direct but important biogeochemical interactions of dissolved organic matter in aquatic systems are also important but poorly studied at the ecosystem level. Continued intensive study of natural dissolved organic substances in aquatic ecosystems is also resulting in improved understanding of the many ways in which these diverse compounds, particularly humic compounds, can interact with other important metabolic components. For example, dissolved organic compounds can function in the following ways ... 

Kaschl, A., Romheld, V., and Chen, Y. (2002). Cadmium binding by fractions of dissolved organic matter and humic substances from municipal solid waste compost. /. Environ. Qual. 31,1885-1892. 

Kalbitz, K., Geyer, S., and Geyer, W. (2000). A comparative characterization of dissolved organic matter by means of original aqueous samples and isolated humic substances. Chemosphere 40,1305-1312. 

Schulten, H.-R., Leinweber, R, and Jandl, G. (2002). Analytical pyrolysis of humic substances and dissolved organic matter in water. In Refractory Organic Substances (ROS) in the Environment, Frimmel, F. H., Abbt-Braun, G., Heumann, K. G., Hock, B., Ludemann, H.-D., and Spiteller, M., eds., Wiley-VCH, Weinheim, pp. 163-187. 

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