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- W4294713105 abstract "The pollution risks due to the soil migration of toxic metal(loid)s (TMs) are a greatly hazard to ecological environment as well as animal and human health. Previous studies have primarily focused on surface contamination while deep soil layers often contain dangerous levels of TMs. We used restored wheat and rice farmlands from aquaculture ponds as a case study to examine the ecological risk and distribution of TMs in soil profiles. The elements Cu, Zn, Cr, Cd, Hg and As were markedly enriched in the 60–180 cm soil layers of restored farmland, and their concentrations decreased in the several depths as follows: 120–180 cm > 60–120 cm > 0–60 cm. Concentrations of TMs were 9.5–128 % greater in the restored farmlands relative to farmlands not exposed to aquaculture practices. Cadmium and mercury were the most serious contaminants and increased the overall ecological risk. The subsoil of wheat farming system had the highest pollution risk versus the restored rice farmland at 60–120 cm due to elevated levels of Cu, Zn and Pb. Toxic metal(loid)s might be derived from natural sources in deep soil of conventional farmland whereas aquaculture practices were found to constitute the major contribution in the subsoil of restored farmland. Our results indicated that the TMs that were buried in deep soil layers migrated upward and were a significant pollution risk. Urgent actions should be taken to identify and alleviate the contamination sources of these deep soils in addition to the conventional leaching and migration processes of surface contaminants." @default.
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- W4294713105 date "2022-12-01" @default.
- W4294713105 modified "2023-09-26" @default.
- W4294713105 title "Hazardous toxic metal(loid)s in top- and deep-soils during the transformation of aquaculture ponds restored to farmland" @default.
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- W4294713105 doi "https://doi.org/10.1016/j.scitotenv.2022.158569" @default.
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