Abstract
For maximally reserving soil fertility, two critical parameters (i.e. time and temperature) of low-temperature thermal desorption (LTTD) were initially optimized to remediate the mercury-contaminated soil from a mercury mining area. The effect of LTTD on soil properties was investigated, and the bioaccumulation of total mercury (THg) and methylmercury (MeHg) in rice (Oryza sativa L.) were researched via a pot experiment. Results indicated that the physicochemical properties and fertility of the soil after LTTD still meet the requirements of rice growth. Moreover, the concentrations of THg and MeHg in the remediated soil were decreased by 94.1% and 98.8%, respectively. Further, the bioavailability of Hg in soil was significantly reduced. More importantly, the concentrations of THg and MeHg in the seed of rice plant cultivated on the remediated soil were decreased by 57.6% and 80.2%, respectively. Overall, LTTD technology could efficiently remediate Hg-contaminated soil and be a promise remediation strategy.
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Acknowledgements
This work was financially supported by the National Key Research and Development Program of China (No.2019YFC1805200), Joint of National Natural Science Foundation of China and Guizhou Province (U1612442) and the Science and Technology Funds of Guizhou Province, China (No. Qiankehe Jichu [2020] 1Z037).
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Yu, Z., Liu, H., Mao, S. et al. Low-Temperature Thermal Desorption Effectively Mitigates Accumulation of Total Mercury and Methylmercury in Rice (Oryza sativa L.). Bull Environ Contam Toxicol 109, 757–763 (2022). https://doi.org/10.1007/s00128-021-03445-8
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DOI: https://doi.org/10.1007/s00128-021-03445-8