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1D - Soil and Sediment Contamination (TU9/2) Understanding variation in adsorption across contaminated land. Collins, John 1, Worrall, Fred1, 1 Dept. of Geological Scieces, Durham, Co. Durham, UK ABSTRACT- As a first-order approximation the adsorption of organic contaminants can be described by Koc and percentage of organic carbon in a soil. However, values of Koc for any given compound are known to vary by orders of magnitude and so for an adequate description of adsorption there needs to be a better understanding of the connection between the nature of the organic matter and adsorption. Several studies have linked variation in the aromaticity and O/H ratio of the organic matter to variation in the Koc of organic contaminants. This study has examined the variation in the nature of organic matter across a series of former industrial sites as a means of understanding how Koc will vary across contaminated sites. The organic matter has been subjected to series of standard soil tests in conjunction with examination by solid state NMR spectroscopy. The NMR studies allow the connection between Koc and organic matter functionality to be established while standard soil analysis allow us to link complex organic matter properties to parameters easily obtainable by contaminated land practitioners. Key words: Soil, Adsorption, Orgaic matter, NMR |
