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The Influence of Lipids on the Energetics of Uptake of Polycyclic Aromatic Hydrocarbons by Natural Organic Matter

Department of Chemistry and Biochemistry, South Dakota State University, Box 2202, Brookings, SD 57007-0896

View larger version (25K): [in a new window]   Fig. 1. Carbon-13 nuclear magnetic resonance (NMR) spectra for San Diego sediment (SD), Poinsett soil (PS), Allivar soil (AS), Hetland soil (HS), and Guanella Pass peat (GP) before and after lipids extraction.

View larger version (26K): [in a new window]   Fig. 2. The distribution of organic carbon for the whole geosorbents: San Diego sediment (SD), Poinsett soil (PS), Allivar soil (AS), Hetland soil (HS), and Guanella Pass peat (GP).

View larger version (14K): [in a new window]   Fig. 3. The variation of distribution coefficients (Kd) with temperature for sorption of fluorene, phenanthrene, and pyrene on the geosorbents: , San Diego sediment (SD); , Guanella Pass peat (GP); , Allivar soil (AS); •, Poinsett soil (PS); and x, Hetland soil (HS). The open labels correspond to the extracted samples. The error bars represent the absolute standard deviations.

View larger version (15K): [in a new window]   Fig. 4. The variation of distribution coefficients normalized to organic carbon content with temperature for sorption of fluorene, phenanthrene, and pyrene on the geosorbents: , San Diego sediment (SD); , Guanella Pass peat (GP); , Allivar soil (AS); •, Poinsett soil (PS); and x, Hetland soil (HS). The open labels correspond to the extracted samples. The error bars represent the absolute standard deviations.

View larger version (15K): [in a new window]   Fig. 5. The variation of free energy change (G) with temperature for sorption of fluorene, phenanthrene, and pyrene on the geosorbents: , San Diego sediment (SD); , Guanella Pass peat (GP); , Allivar soil (AS); •, Poinsett soil (PS); and x, Hetland soil (HS). The open labels correspond to the extracted samples. The error bars represent the absolute standard deviations.