期刊名称：African Journal of Environmental Science and Technology
电子版ISSN：1996-0786
出版年度：2011
卷号：5
期号：6
页码：427-436
DOI：10.5897/AJEST10.306
语种：English
出版社：Academic Journals
摘要：Soil solution samples were extracted from a vertical unsaturated zone profile and groundwater samples were obtained from the Densu river basin, Ghana. Major ions and trace metals in the soil solution, groundwater samples and solid soil (Ca2+, Na+, Mg2+, K+, NO3-, SO42-, Cl-, HCO32-, PO43-, Fe, Mn, V, Cu, Zn, Cr) were analyzed along with other hydrochemical parameters. Impact of the unsaturated zone soil solution chemistry on the groundwater and metal mobility and potential of leaching into the groundwater system have been evaluated.The groundwater were characterized by slightly alkaline pH (6.22 to 6.67), EC (98.8 to 382.0 µS/cm), TDS (49.7 to 192.4) and total alkalinity (43.63 to 149.14 mg/L). Calcium was the dominant cation, with major amounts of sulphate, chloride, nitrate and carbonate species present. Na/K cations dominated the leached soil-solution with SO42-and Cl-anions.Soil−liquid partitioning coefficients (Kd) for the metals Fe, Cu, Mn, Cr, V and Zn evaluated after experimental determinations showed wide variability within the profile. The relationships between the calculated values were explored relative to variations in soil solution pH, soil organic carbon (SOC), and concentrations of total soil metal. The results of the empirical linear regressions showedKdvalues were best predicted with total soil metal contents (withR2values of 0.04 to 0.69).
关键词：Unsaturated zone; groundwater; major ions; trace elements; partitioning coefficient
