Absorption and Desorption of Lead and Manganese in Clay-Textured Soil
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Abstract
This research aims to assess the absorption and desorption of lead (Pb) and manganese (Mn) in clay-textured agricultural soil through adsorption and release studies. Specifically, the study investigates the impact of pH values (5.0, 7.0, 9.0, and the control at soil pH of 6.4) on the absorption and desorption of these heavy metals, measured by using an atomic absorption spectrometer at wavelengths of 217 nm for lead and 279 nm for manganese. Results indicate that lead absorption ranged from 96.05% to 99.28%, with corresponding adsorption capacities of 0.192 to 0.199 mg/g. For manganese, absorption at pH 5.0, 7.0, and 9.0 was 100%, while the control exhibited 47.58%. The adsorption capacities were 0.200 and 0.095 mg/g. Regarding release, lead percentages at pH 5.0, 7.0, 9.0, and the control were 5.21%, 5.48%, 6.17%, and 4.53%, respectively. Manganese did not release at pH 5.0, 7.0, 9.0, and the control, with only 2.34% release. The study concludes that lead and manganese are absorbed in the soil, potentially causing agricultural soil contamination. Additionally, this absorption property can be valuable in designing efficient adsorbents for removing or reducing heavy metal contamination in soil.
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References
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