South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, 510300, China; Faculty of Science, Yamagata University, Yamagata, 990-8560, Japan; Sanya Tropical Fisheries Research Institute, Sanya, 572025, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China; Key Laboratory of Fishery Ecology and Environment, Guangdong Province, Guangzhou, 510300, China; Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, 510300, China.
College of Oceanography, Hohai University, Nanjing, 245700, China.
Chemosphere. 2023 Jul;329:138592. doi: 10.1016/j.chemosphere.2023.138592. Epub 2023 Apr 5.
Heavy metals (HMs) are routine contaminants due to their extensive use worldwide. Rare earth elements (REEs) are emerging contaminants because of their global exploitation for use in the high-tech sector. Diffusive gradients in thin films (DGT) are an effective method for measuring the bioavailable component of pollutants. This study represents the first assessment of the mixture toxicity of HMs and REEs in aquatic biota using the DGT technique in sediments. Xincun Lagoon was chosen as the case study site because it has been contaminated by pollutants. Nonmetric multidimensional scaling (NMS) analysis reveals that a wide variety of pollutants (Cd, Pb, Ni, Cu, InHg, Co, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, and Yb) are primarily impacted by sediment characteristics. Appraisal of single HM-REE toxicity reveals that the risk quotient (RQ) values for Y, Yb and Ce notably exceeded 1, demonstrating that the adverse effects of these single HMs and REEs should not be ignored. The combined toxicity of HM-REE mixtures in terms of probabilistic ecological risk assessment shows that the Xincun surface sediments had a medium probability (31.29%) of toxic effects on aquatic biota.
重金属（HMs）是由于其在全球范围内的广泛使用而成为常规污染物。由于全球对其在高科技领域的开发利用，稀土元素（REEs）成为新兴污染物。薄膜扩散梯度（DGT）是一种测量污染物生物可利用成分的有效方法。本研究首次利用 DGT 技术评估沉积物中重金属和稀土元素混合物对水生物群的混合毒性。新存湖被选为案例研究地点，因为它已经受到污染物的污染。非度量多维尺度分析（NMS）分析表明，各种各样的污染物（Cd、Pb、Ni、Cu、InHg、Co、Y、La、Ce、Pr、Nd、Sm、Eu、Gd、Dy、Ho、Er、Tm 和 Yb）主要受沉积物特性的影响。单一 HM-REE 毒性评估表明，Y、Yb 和 Ce 的风险商（RQ）值明显超过 1，表明这些单一 HM 和 REE 的不利影响不容忽视。根据概率生态风险评估，HM-REE 混合物的联合毒性表明，新存表层沉积物对水生物群具有中等毒性的可能性（31.29%）。
