Fractionation dissolved organic carbon

Hamilton SK, Bunn SE, Thoms MC et al (2005) Persistence of aquatic refugia between flow pulses in a dryland river system (Cooper Creek, Australia). Lirrmol Oceanogr 50 743-754 Bernal S, Butturini A, Sabater E (2002) Variability of DOC and nitrate responses to storms in a small Mediterranean forested catchment. Hydrol Earth Syst Sci 6 1031-1041 Romani AM, Vazquez E, Butturini A (2006) Microbial availability and size fractionation of dissolved organic carbon after drought in an intermittent stream biogeochemical link across the Stream-Riparian interface. Microb Ecol 52 501-512... 

For practical purposes, the distinction between dissolved organic carbon and particulate organic carbon is that the latter is retained on filters of known porosity. Membrane filters with 0.25-1. Oum pore size and glass fibre Whatman G F/C filters are commonly used. By using the particulate fraction of a sample retained on pre-combusted Whatman G F/C filters for... 

Dissolved organic carbon is defined operationally as the fraction of the total organic carbon in the water phase that will pass through a 0.45 pm filter. Assuming illustrative values for ( )p of 10 7 kg/L and (% of 10 7 kg/L, it follows that a chemical with a log Kow of 5 will have Fdw of 99.6%, whereas a chemical with a log Kow of 8 will have a FDW of only 18%. 

Easthouse, K., B. J. Mulder, N. Christophersen, and H. M. Seip. 1992. Dissolved organic carbon fractions in soil and streamwater during variable hydrological conditions at Birkeness, Southern Norway. Water Resources Research 28 1585-1596. 

Leenheer, J. A. 1980. Study of sorption of complex organic solute mixtures on sediments by dissolved organic carbon fractionation analysis. In Contaminants and Sediments. (R. A. Baker, Ed.). Ann Arbor Science, Ann Arbor, MI. 

Leenheer, J. A. 1981. Comprehensive approach to preparative isolation and fractionation of dissolved organic carbon from natural waters and waste waters. Environmental Science and Technology 15 578-587. 

Covert, J. S. and M. A. Moran. 2001. Molecular characterization of estuarine bacterial communities using high- and low-molecular weight fractions of dissolved organic carbon. Aquatic Microbial Ecology 25 127-139. 

Crum, R.H., Murphy, E.M. and Keller, C.K. (1996) A non-adsorptive method for the isolation and fractionation of natural dissolved organic carbon. Water Res., 30, 1304-1311. 

Vogl, J. and Heumann, K.G. (1998) Development of an ICP-IDMS method for dissolved organic carbon determinations and its application to chromatographic fractions of heavy metal complexes with humic substances. Anal. Chem., 70, 2038-2043. 

Another common component in natural waters is the poorly characterized fraction referred to as dissolved organic carbon (DOC). As a mixture of compounds, there is no data on the reactions of either e aq or H-. The reaction of DOC with OH has been evaluated by Westerhoff et al. [42], and earlier by S. Peyton (Illinois Department of Energy and Natural Resources, Champaign, IL, personal communication). Because of the varied nature of DOC in various waters, it is likely that each source may have slightly... 

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