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Influence of extracellular polymeric substances on arsenic bioaccumulation and biotransformation in biofilms
Chemosphere ( IF 8.1 ) Pub Date : 2023-11-28 , DOI: 10.1016/j.chemosphere.2023.140798 Donghua Qiu 1 , Ziyue Yu 1 , Xin Zhang 1 , Ce Wen 1 , Changzhou Yan 2
Chemosphere ( IF 8.1 ) Pub Date : 2023-11-28 , DOI: 10.1016/j.chemosphere.2023.140798 Donghua Qiu 1 , Ziyue Yu 1 , Xin Zhang 1 , Ce Wen 1 , Changzhou Yan 2
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It is well recognized that biofilms can biosorb and biotransform heavy metals in aquatic environments. However, the effects of extracellular polymeric substance (EPS) on inorganic arsenic (As) bioaccumulation and biotransformation in biofilms are still unrevealed and need to be investigated. In order to explore the above scientific issues, the As accumulation and speciation in EPS-containing or EPS-free biofilms and growth medium under As(V)/As(III) exposure conditions were measured. After the removal of EPS, the amount of As uptake (As) and As adsorption (As) in biofilms were significantly reduced, no matter whether exposed to As(V) or As(III). FTIR analysis further suggested that the interaction between these functional groups with As was limited after the removal of EPS. In the EPS-containing biofilms, the As was mainly As(V) with low toxicity. However, after the removal of EPS, the As was mainly As(III) with high fluidity, and no methylated As was found. Moreover, the removal of EPS inhibited As(III) oxidation and methylation by biofilms, resulting in the decrease of As(V) and methylated As in the growth medium. The findings of this study emphasized the essential impact of EPS on the biosorption and biotransformation of As in biofilms. This study provides a unique understanding of the role of biofilms in As biogeochemical cycle, and water quality purification function in water environments.
中文翻译：
细胞外聚合物对生物膜中砷生物富集和生物转化的影响
众所周知，生物膜可以生物吸附和生物转化水生环境中的重金属。然而，细胞外聚合物（EPS）对生物膜中无机砷（As）生物积累和生物转化的影响仍未被揭示，需要研究。为了探讨上述科学问题，测量了As(V)/As(III)暴露条件下含EPS或不含EPS的生物膜和生长培养基中As的积累和形态形成。去除EPS后，无论暴露于As(V)还是As(III)，生物膜中As的吸收量(As)和As吸附量(As)均显着减少。 FTIR 分析进一步表明，去除 EPS 后，这些官能团与 As 之间的相互作用受到限制。含EPS生物膜中的As主要为As(V)，毒性较低。但去除EPS后，As主要为As(III)，流动性较高，未发现甲基化As。此外，EPS的去除抑制了生物膜对As(III)的氧化和甲基化，导致生长培养基中As(V)和甲基化As的减少。本研究的结果强调了 EPS 对生物膜中 As 的生物吸附和生物转化的重要影响。这项研究为生物膜在砷生物地球化学循环中的作用以及水环境中的水质净化功能提供了独特的理解。
更新日期：2023-11-28
中文翻译：
细胞外聚合物对生物膜中砷生物富集和生物转化的影响
众所周知，生物膜可以生物吸附和生物转化水生环境中的重金属。然而，细胞外聚合物（EPS）对生物膜中无机砷（As）生物积累和生物转化的影响仍未被揭示，需要研究。为了探讨上述科学问题，测量了As(V)/As(III)暴露条件下含EPS或不含EPS的生物膜和生长培养基中As的积累和形态形成。去除EPS后，无论暴露于As(V)还是As(III)，生物膜中As的吸收量(As)和As吸附量(As)均显着减少。 FTIR 分析进一步表明，去除 EPS 后，这些官能团与 As 之间的相互作用受到限制。含EPS生物膜中的As主要为As(V)，毒性较低。但去除EPS后，As主要为As(III)，流动性较高，未发现甲基化As。此外，EPS的去除抑制了生物膜对As(III)的氧化和甲基化，导致生长培养基中As(V)和甲基化As的减少。本研究的结果强调了 EPS 对生物膜中 As 的生物吸附和生物转化的重要影响。这项研究为生物膜在砷生物地球化学循环中的作用以及水环境中的水质净化功能提供了独特的理解。
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