Interactions of arsenic, copper, and zinc in soil-plant system: Partition, uptake and phytotoxicity

Bing Gong, Erkai He, Hao Qiu*, Cornelis A.M. Van Gestel, Ana Romero-Freire, Ling Zhao, Xiaoyun Xu, Xinde Cao

*Corresponding author for this work

    Research output: Contribution to JournalArticleAcademicpeer-review

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    Abstract

    Arsenic, copper, and zinc are common elements found in contaminated soils but little is known about their combined effects on plants when presented simultaneously. Here, we systematically investigated the phytotoxicity and uptake of binary and ternary mixtures of As, Cu, and Zn in a soil-plant system, using wheat (Triticum aestivum) as model species. The reference models of concentration addition (CA) and response addition (RA) coupled with different expressions of exposure (total concentrations in soil ([M]tot, mg/kg), free ion activities in soil solution ({M}, μM), and internal concentrations in plant roots ([M]int, μg/g)), were selected to assess the interaction mechanisms of binary mixtures of As–Cu, As–Zn, and Cu–Zn. Metal(loid) interactions in soil were estimated in terms of solution-solid partitioning, root uptake, and root elongation effects. The partitioning of one metal(loid) between the soil solution and solid phase was most often inhibited by the presence of the other metal(loid). In terms of uptake, inhibitory effects and no effects were observed in the mixtures of As, Cu, and Zn, depending on the mixture combinations and the dose metrics used. In terms of toxicity, simple (antagonistic or synergistic) and more complex (dose ratio-dependent or dose level-dependent) interaction patterns of binary mixtures occurred, depending on the dose metrics selected and the reference models used. For ternary mixtures (As-Cu-Zn), nearly additive effects were observed irrespective of dose descriptors and reference models. The observed interactions in this study may help to understand and predict the joint toxicity of metal(loid)s mixtures in soil-plant system. Mixture interactions and bioavailability should be incorporated into the regulatory framework for accurate risk assessment of multimetal-contaminated sites.

    Original languageEnglish
    Article number140926
    Pages (from-to)1-10
    Number of pages10
    JournalScience of the Total Environment
    Volume745
    Early online date17 Jul 2020
    DOIs
    Publication statusPublished - 25 Nov 2020

    Funding

    This study was supported by the National Natural Science Foundation of China (No. 41701571 , No. 41701573 , No. 41877500 , and No. 41977115 ), Shanghai Rising-Star Program (No. 20QA1404500 ), the National Key Research and Development Program of China (No. 2018YFC1800600 , No. 2018YFD0800700 ), the Research Fund Program of Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (No. 2018K01 ), Science and Technology Program of Guangzhou, China (No. 201904010116 ), Fundamental Research Funds for the Central Universities (No. 19lgpyl50 ), and the Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product (No. 17Z1170010019 ).

    FundersFunder number
    Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product17Z1170010019
    National Natural Science Foundation of China41701571, 41701573, 41877500, 41977115
    Guangzhou Science and Technology Program key projects201904010116
    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology2018K01
    National Key Research and Development Program of China2018YFD0800700, 2018YFC1800600
    Fundamental Research Funds for the Central Universities19lgpyl50
    Shanghai Rising-Star Program20QA1404500
    Key Laboratory of Original Agro-Environmental Pollution Prevention and Control

      Keywords

      • Interaction
      • Metal(loid)
      • Mixture toxicity
      • Modeling
      • Soil

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