Assessment of dioxin risk in the selected soils through sorption/desorption
Keywords:
Sorption; Desorption, Dioxins; Soil series; Environmental riskAbstract
Dioxins are deposited in soils from both natural and anthropogenic sources. Sorption and desorption capacity of six different soils representing a specific soil series were analyzed for 2 Chloro dibenzo- p-dioxin (2 Cl- DD) and dibenzo- p-dioxin (DD). Calculated Kd values for 2 Cl-DD and DD were in the range of 219-2623 L/Kg and 58-1583 L/Kg respectively. Sorption was reported high for the soil series of Burhan, Charsadda and Warsak having samples SS1, SS2 and SS3, respectively. Minor variations were observed among the distribution coefficient (Kd) values of chlorinated and non-chlorinated dioxins. Application of Freundlich and Langmuir Isotherms showed that most of the samples fitted the Freundlich isotherm. This study revealed low sorption capacity of the selected soils towards 2 Cl-DD and DD and hence a risk of potential release to the environment
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