The diffusive gradients in thin films (DGT) technique is a useful tool for assessing metal bioavailability in sediments. However, the DGT technique has not been used to predict metal bioaccumulation in plants grown in sediments in river systems. In this study, the DGT technique was evaluated for predicting metal bioaccumulation in Phragmites australis growing in contaminated sediments. In sediments with high levels of contamination, release of DGT-labile Cr, Zn, Cu, and Cd occurred, which resulted in high bioaccumulation of these metals in P. australis. Bioaccumulation of Cr, Cu, Zn, and Cd was strongly correlated with the metal concentrations in the sediments measured by the DGT technique. By contrast, the correlation between sediment content and bioaccumulation for As was weak. There were significant negative correlations between the content of Ni in the plant tissues and the contents of the other metals. Overall, the DGT technique provided predictions of metal bioaccumulation similar to those obtained using total metal measurements in multiple polluted sediment samples. Therefore, DGT analysis could be used for assessing heavy metal bioavailability, and metal bioaccumulation in P. australis was not all significantly correlated with the bioavailability concentrations of metals in river sediments.

中文翻译：

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估算在沉积物中生长的植物中金属生物富集的薄膜技术中扩散梯度的评估

薄膜中的扩散梯度（DGT）技术是评估沉积物中金属生物利用度的有用工具。但是，DGT技术尚未用于预测河流系统沉积物中生长的植物中的金属生物富集。在这项研究中，对DGT技术进行了评估，以预测在受污染的沉积物中生长的芦苇中金属的生物富集。在污染程度高的沉积物中，发生了DGT不稳定的Cr，Zn，Cu和Cd的释放，这导致这些金属在P. australis中具有很高的生物蓄积性。。Cr，Cu，Zn和Cd的生物富集与通过DGT技术测得的沉积物中的金属浓度密切相关。相反，沉积物含量与砷的生物积累之间的相关性较弱。植物组织中的镍含量与其他金属的含量之间存在显着的负相关。总体而言，DGT技术提供的金属生物富集预测与使用多个污染的沉积物样品中的总金属测量所获得的预测相似。因此，DGT分析可用于评估重金属的生物利用度，而澳大利亚假单胞菌中的金属生物累积与河流沉积物中金属的生物利用度浓度并没有显着相关。