Gu Yang-Guang, Huang Hong-Hui, Jiang Shi-Jun, Gong Xiu-Yu, Liao Xiu-Li, Dai Ming
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China; Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou 510300, China; Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou 510300, China.
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511485, China; Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou 510300, China; Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou 510300, China.
Sci Total Environ. 2022 Jun 15;825:154069. doi: 10.1016/j.scitotenv.2022.154069. Epub 2022 Feb 22.
Mercury (Hg) is a global, persistent and inevitable pollutant, the toxicity of which is mostly reflected in its species including inorganic Hg (InHg) and methyl mercury (MeHg). Using diffusive gradients in thin films (DGT) is deemed as a reliable technique to determine the bioavailability of pollutants. This study is the first attempt to assess the integrated toxicity of mercury species mixtures in sediments to the aquatic biota based on the DGT technique. In the course, the Daya Bay under serious anthropogenic influences was selected as the study case. The results showed that the DGT concentrations of InHg and MeHg were detected as 0.30-1.93 μg/L and 0.28-1.94 μg/L respectively in the surface sediments collected from the Daya Bay. In terms of the toxicity of single mercury species, the risk quotient (RQ) values of InHg and MeHg significantly exceeded 1, indicating that the adverse effects of InHg and MeHg should not be ignored. In terms of the integrated toxicity of mercury species mixtures, the probabilistic biological risk assessment results demonstrate that Daya Bay features low (3.32%) probability of toxic effects in its surface sediments to the aquatic biota.
汞（Hg）是一种全球性、持久性且不可避免的污染物，其毒性主要体现在包括无机汞（InHg）和甲基汞（MeHg）在内的各种形态中。使用薄膜扩散梯度技术（DGT）被认为是测定污染物生物可利用性的可靠技术。本研究首次尝试基于DGT技术评估沉积物中汞形态混合物对水生生物群的综合毒性。在此过程中，选择受严重人为影响的大亚湾作为研究案例。结果表明，在从大亚湾采集的表层沉积物中，检测到的InHg和MeHg的DGT浓度分别为0.30 - 1.93μg/L和0.28 - 1.94μg/L。就单一汞形态的毒性而言，InHg和MeHg的风险商（RQ）值显著超过1，表明InHg和MeHg的不利影响不容忽视。就汞形态混合物的综合毒性而言，概率性生物风险评估结果表明，大亚湾表层沉积物对水生生物群产生毒性影响的概率较低（3.32%）。
