Akademik Veri Yönetim Sistemi
SOIL & SEDIMENT CONTAMINATION, cilt.24, sa.1, ss.64-75, 2015 (SCI-Expanded)
The adsorption of chlorpyrifos and TCP (3,5,6, trichloro-2-pyridinol) was determined in four soils (Mollisol, Inceptisol, Entisol, Alfisol) having different specific surface areas (19-84m(2) g(-1)) but rather similar organic matter content (2.4-3.5%). Adsorption isotherms were derived from batch equilibration experiments at 25 degrees C. After liquid-liquid extraction, the chlorpyrifos and TCP concentrations in the solution phase were determined by gas chromatography with an electron capture detector. Adsorption coefficients were calculated using the Freundlich adsorption equation. High K-F coefficients for chlorpyrifos (15.78) and TCP (6.54) were determined for the Entisol soil, while low K-F coefficients for chlorpyrifos (5.32) and TCP (3.93) were observed in the Alfisol soil. In all four soils, adsorption of chlorpyrifos was higher than that of TCP. A surface complexation model, the constant capacitance model, was well able to fit the adsorption isotherms of both chlorpyrifos and TCP on all four soils. The results showed that specific surface area affected adsorption of both chlorpyrifos and TCP. Among the soil properties, specific surface area could be a better indicator than organic matter content alone for adsorption of chlorpyrifos and TCP by soils that contained low organic matter.