Use of DGT and conventional methods to predict sediment metal bioavailability to a field inhabitant freshwater snail (Bellamya aeruginosa) from Chinese eutrophic lakes
Use of DGT and conventional methods to predict sediment metal bioavailability to a field inhabitant freshwater snail (Bellamya aeruginosa) from Chinese eutrophic lakes
复制标题
使用 DGT 和常规方法预测中国富营养化湖泊中淡水蜗牛 (Bellamya aeruginosa) 的沉积物金属生物利用度
DOI：
10.1016/j.jhazmat.2013.11.030
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发表时间：
2014
影响因子：
13.6
通讯作者：
Chengxin Fan
中科院分区：
文献类型：
--
作者：
Hongbin Yin;Yongjiu Cai;Hongtao Duan;Junfeng Gao;Chengxin Fan
采用薄膜扩散梯度法(DGT)和常规方法(包括SEM-AVS模型、BCR顺序提取和总金属浓度)研究了中国富营养化湖泊淡水钉螺对沉积物中铬、镍、铜、锌、镉和铅的生物有效性。评价了这些方法的性能以及DGT测量与常规方法的关系。结果表明，DGT测量的金属浓度与使用SEM-AVS模型以及顺序提取的欧洲共同体参照局(BCR)金属组分的测试结果具有弱相关性。在所使用的方法中，DGT测定的铬、镍、铜、铅与钉螺组织中的金属浓度显著相关，而扫描电子显微镜-AVS能很好地预测铬、镍、铅的生物有效性，但不能很好地预测其生物有效性。最后，BCR顺序提取和总金属浓度只与钉螺对铅的生物有效性有很好的相关性。总体而言，本研究的结果表明，DGT在预测钉螺体内金属积累方面表现最好，由于其操作简单和有效性较高，可以用来预测淡水湖沉积物中的沉积物金属对野外钉螺的生物有效性。
In this study, we used the diffusive gradients in thin films (DGT) and conventional methods (including SEM–AVS models, BCR sequential extraction and total metal concentrations) to assess sediment Cr, Ni, Cu, Zn, Cd and Pb bioavailability to field inhabitant freshwater snails (Bellamya aeruginosa) from Chinese eutrophic lakes. The performance of these methods and the relationship between DGT measurements and conventional methods were evaluated. The results showed that DGT-measured metal concentrations have weak correlations with results from tests using SEM–AVS models as well as sequentially extracted European Community Bureau of Reference (BCR) metal fractions. Among the methods used, Cr, Ni, Cu, and Pb measured by DGT were significantly correlated with metal concentrations in the tissue of snails, while SEM–AVS could predict Cr, Ni and Pb bioavailability well, but not SEM–AVS/fOC. Finally, BCR sequential extraction and total metal concentrations only correlated well with Pb bioavailability to snails. Overall, the results of this study indicated that DGT performed best in predicting metal accumulation in snails and which could be used to predict sediment metal bioavailability to field inhabitant snails from freshwater lake sediments due to their simple manipulation and validity.