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• W2248929130 abstract "Determination of the sorption coefficients (Koc) of strongly hydrophobic organic chemicals (SHOCs) in aqueous systems is difficult due to their very low solubility and the potential to adsorb on container walls and vessels. ?-endosulfan, dieldrin, DDT, and anthracene were used in this study as probe compounds. Sorption of dieldrin and ?-endosulfan on Teflon lined centrifuge tubes (TLCT) and HPLC vials (HPLCV) was measured in methanol-water systems. Similarly, DDT and anthracene sorption on TLCT was also measured. The volume fraction of methanol (fc) ranged from 0.01to 1. The solution concentrations of 12C-dieldrin and 12C-?-endosulfan were analyzed using high pressure liquid chromatography (HPLC) with UV detection. Liquid scintillation counting (LSC) was used to measure solution concentrations of 14C-DDT and 14C-anthracene. The container sorption coefficients (KW) in aqueous systems were obtained by use of the Solvophobic model and extrapolating the sorption coefficient to zero fraction cosolvent (fc = 0). Using the Solvophobic model, the calculated percent recovery of ?-endosulfan due to sorption on TLCT and HPLCV in aqueous system was 30%. Dieldrin recovery at fc = 0 was 6 and 32% from HPLCV and TLCT, respectively. DDT adsorbed most on TLCT followed by dieldrin and least anthracene, with calculated recoveries in aqueous system of 29, 32, and 52%, respectively. Negligible adsorption was detected for dieldrin at fc ? 0.45 in TLCT and at fc ? 0.70 in HPLCV. Similarly negligible adsorption was detected for DDT and anthracene at fc ? 0.45 in TLCT. It is important to point out that most researchers assume that Teflon lined centrifuge tubes and HPLC vials do not adsorb organic chemicals. The sorption coefficients of dieldrin, DDT, and anthracene by 3 carbonatic soils, one organic soil, and one spodosol, were then determined in methanol-water systems that eliminated sorption on the TLCT and HPLCV. The soil sorption coefficients (KW) in aqueous systems were extrapolated at volume fraction methanol (fc = 0). The KW values were then normalized with soil organic carbon content (OC) to obtain [KOC = KM/OC] values. The KOC values for DDT, dieldrin, and anthracene obtained in this study were much lower than literature values and did not drastically vary across soil as it is reported in the literature. The KOC values for dieldrin obtained in this study varied within a factor of 2 compared to the literature factor of 4. For DDT, the KOC values varied within a factor of 4 compared to the reported literature factor of 13. The KOC data from this study strongly indicate that sorption on container walls if neglected is a potential source of error while determining adsorption of strongly hydrophobic chemicals in aqueous systems. It is therefore recommended that sorption experiments of strongly hydrophobic chemicals be carried out in TLCT above 45% cosolvent in a mixture with water and at and above 70% cosolvent in HPLC vials. The sorption coefficients in aqueous systems can then be calculated using the Solvophobic model eliminating…" @default.
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• W2248929130 date "2007-01-01" @default.
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• W2248929130 title "Determination of Aqueous Soil Sorption Coefficient (Koc) of Strongly Hydrophobic Organic Chemicals (SHOCs) Using Mixed Solvent Systems and the Solvophobic Model" @default.
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