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The Influence of the Reduction in Clay Sediments in the Level of Metals Bioavailability—An Investigation in Liujiang River Basin after Wet Season

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  • Xiongyi Miao

    (School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550001, China
    School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    Key Laboratory of Karst Dynamics, MNR&GZAR, Institute of Karst Geology, CAGS, Guilin 541004, China)

  • Jianping Liang

    (Guilin Meteorological Bureau of Guangxi, Guilin 541000, China)

  • Yupei Hao

    (Key Laboratory of Karst Dynamics, MNR&GZAR, Institute of Karst Geology, CAGS, Guilin 541004, China
    Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China)

  • Wanjun Zhang

    (Key Laboratory of Karst Dynamics, MNR&GZAR, Institute of Karst Geology, CAGS, Guilin 541004, China)

  • Yincai Xie

    (Key Laboratory of Karst Dynamics, MNR&GZAR, Institute of Karst Geology, CAGS, Guilin 541004, China)

  • Hucai Zhang

    (Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China)

Abstract

The seasonal elevation of metals’ bioavailability can aggravate the threat of metal contamination in the aquatic environment. Nevertheless, their regulations have rarely been studied, particularly the connections between metals’ transformation and environmental variations. Therefore, the catchment area of Liujiang River was taken as an example in this study, their seasonal variations in metals’ bioavailability in sediments, especially during the wet season, was investigated to recover the processes associated with metals’ speciations and multiple environmental factors. The results revealed that the concentration of metals in sediments were high overall in the wet season, but low in the dry season. The significantly reduced ratio of metals in non-residual forms was largely related to the overall reduction in metals in oxidizable and reducible forms after the wet season. However, the elevated BI indexes of most metals suggested their increased bioavailability in the dry season, which should be closely related to their corresponding elevations in carbonate-bound and exchangeable forms after the wet season. The variations in metals’ bioavailability were primarily related to their predominance of exchangeable and carbonate-bound form. The higher correlation coefficients suggested the destabilization of the oxidizable form should be treated as a critical approach to the impact of metals’ bioavailability after the wet season. In view of that, sediments’ coarsening would pose the impacts on the destabilization of exogenous metals in sediments, the reduction in clay sediments should be responsible for the elevation of metals bioavailability after the wet season. Therefore, the monitoring of metals’ bioavailability in sediments should be indispensable to prevent metal contamination from enlarging the scope of their threat to the aquatic environment of the river, especially after the wet season.

Suggested Citation

  • Xiongyi Miao & Jianping Liang & Yupei Hao & Wanjun Zhang & Yincai Xie & Hucai Zhang, 2022. "The Influence of the Reduction in Clay Sediments in the Level of Metals Bioavailability—An Investigation in Liujiang River Basin after Wet Season," IJERPH, MDPI, vol. 19(22), pages 1-16, November.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:22:p:14988-:d:972302
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    References listed on IDEAS

    as
    1. Xiongyi Miao & Mian Song & Gaohai Xu & Yupei Hao & Hucai Zhang, 2022. "The Accumulation and Transformation of Heavy Metals in Sediments of Liujiang River Basin in Southern China and Their Threatening on Water Security," IJERPH, MDPI, vol. 19(3), pages 1-16, January.
    2. Yupei Hao & Xiongyi Miao & Mian Song & Hucai Zhang, 2022. "The Bioaccumulation and Health Risk Assessment of Metals among Two Most Consumed Species of Angling Fish ( Cyprinus carpio and Pseudohemiculter dispar ) in Liuzhou (China): Winter Should Be Treated as," IJERPH, MDPI, vol. 19(3), pages 1-15, January.
    3. Yu, Haochen & Chen, Fu & Ma, Jing & Khan, Zafar Iqbal & Hussain, M. Iftikhar & Javaid, Iqra & Ahmad, Kafeel & Nazar, Sonaina & Akhtar, Shahzad & Ejaz, Abid & Sohail, Muhammad & Nadeem, Muhammad & Hami, 2022. "Comparative evaluation of groundwater, wastewater and canal water for irrigation on toxic metal accumulation in soil and vegetable: Pollution load and health risk assessment," Agricultural Water Management, Elsevier, vol. 264(C).
    4. Yupei Hao & Xiongyi Miao & Hongwei Liu & Dan Miao, 2021. "The Variation of Heavy Metals Bioavailability in Sediments of Liujiang River Basin, SW China Associated to Their Speciations and Environmental Fluctuations, a Field Study in Typical Karstic River," IJERPH, MDPI, vol. 18(8), pages 1-15, April.
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