Abstract
Remediation of potentially toxic trace elements (PTEs) in paddy fields is fundamental for crop safety. In situ application of chemical amendments has been widely adapted because of its cost-effectiveness and environmental safety. The main purpose of this research was to (1) evaluate the reduction in dissolved concentrations of cadmium (Cd) and arsenic (As) with the application of chemical amendments and (2) monitor microbial activity in the soil to determine the remediation efficiency. Three different chemical amendments, lime stone, steel slag, and acid mine drainage sludge, were applied to paddy fields, and rice (Oryza sativa L. Milyang 23) was cultivated. The application of chemical amendments immobilized both Cd and As in soil. Between the two PTEs, As reduction was significant (p < 0.05) with the addition of chemical amendments, whereas no significant reduction was observed for Cd than that for the control. Among six soil-related variables, PTE concentration showed a negative correlation with soil pH (r = −0.70 for As and r = −0.54 for Cd) and soil respiration (SR) (r = −0.88 for As and r = −0.45 for Cd). This result indicated that immobilization of PTEs in soil is dependent on soil pH and reduces PTE toxicity. Overall, the application of chemical amendments could be utilized for decreasing PTE (As and Cd) bioavailability and increasing microbial activity in the soil.
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This study was supported by research grants from the Kangwon National University (C 1009703-01-01) and the Korean Ministry of Environment (MOE) as the “Development of Korean Evaluation and Management System of Surface Soil Resources” in the GAIA Project (201400054003).
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Kim, S.C., Hong, Y.K., Oh, S.J. et al. Effect of chemical amendments on remediation of potentially toxic trace elements (PTEs) and soil quality improvement in paddy fields. Environ Geochem Health 39, 345–352 (2017). https://doi.org/10.1007/s10653-017-9921-x
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DOI: https://doi.org/10.1007/s10653-017-9921-x