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首页> 外文期刊>Environmental Science & Technology >Assessing the Effects of Bioturbation on Metal Bioavailability in Contaminated Sediments by Diffusive Gradients in Thin Films (DGT)
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Assessing the Effects of Bioturbation on Metal Bioavailability in Contaminated Sediments by Diffusive Gradients in Thin Films (DGT)

机译：通过薄膜中的扩散梯度评估生物扰动对污染沉积物中金属生物利用度的影响

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摘要

The burrowing and feeding activities of benthic organisms can alter metal speciation in sediments and affect an organisms' exposure to metals. Recently, the performance of the in situ technique of diffusive gradients in thin films (DGT) for predicting metal bioavailability has been investigated in response to the increasing demand of considering contaminant bioavailability in sediment quality assessments. In this study, we test the ability of the DGT technique for predicting the metal bioavailability in clean and contaminated sediments that are being subjected to varying degrees of sediments disturbance: low bioturbation (bivalve Tellina deltoidalis alone) and high bioturbation (bivalve and actively burrowing amphipod, Victoriopisa australiensis). Significant release of DGT-labile Cd, Ni, Pb, and Zn, but lower Cu and Fe, occurred in the pore and overlying waters of sediments exposed to high bioturbation conditions, resulting in higher bioaccumulation of zinc in bivalves. Strong relationships were found between bioaccumulation of Pb and Zn and time-integrated DGT-metal fluxes, whereas poor relationships were obtained using total or dilute-acid extractable metal concentrations. This results demonstrate that DGT is a useful tool for assessing metal bioavailability in sediments and can provide useful predictions of metal bioavailable to benthic organisms in dynamic sediment environments.
机译：底栖生物的穴居和觅食活动可以改变沉积物中的金属形态，并影响生物对金属的暴露。近来，响应于在沉积物质量评估中考虑污染物生物利用度的日益增长的需求，已经研究了薄膜扩散梯度原位技术（DGT）预测金属生物利用度的性能。在这项研究中，我们测试了DGT技术预测清洁和受污染沉积物中金属生物利用度的能力，这些沉积物正遭受不同程度的沉积物干扰：低生物扰动（仅双壳类Tellina deltoidalis）和高生物扰动（双壳类和主动挖洞的两栖类动物） ，Victoriopisa australiensis）。 DGT不稳定的Cd，Ni，Pb和Zn显着释放，但铜和Fe的含量较低，发生在暴露于高生物扰动条件的沉积物的孔隙和上覆水域中，从而导致双壳类动物体内锌的更高生物累积量。在铅和锌的生物富集与时间积分DGT金属通量之间发现强相关性，而使用总酸或稀酸可萃取金属浓度获得弱关系。该结果表明，DGT是评估沉积物中金属生物利用度的有用工具，并且可以为动态沉积环境中底栖生物的金属生物利用度提供有用的预测。

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  • 来源
    《Environmental Science & Technology》 |2016年第6期|3055-3064|共10页
  • 作者

    Elvio D. Amato; Stuart L. Simpson; Timothy M. Remaili; David A. Spadaro; Chad V. Jarolimek; Dianne F. Jolley;

  • 作者单位

    Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia,School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia;

    Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia;

    Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia,School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia;

    Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia;

    Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia;

    School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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