Institute of International Rivers and Eco-security, Yunnan Key Laboratory of International Rivers and Trans-boundary Eco-security, Yunnan University, Kunming, 650091, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Apr;26(10):9490-9499. doi: 10.1007/s11356-019-04291-2. Epub 2019 Feb 6.
The purposes of this research are to quantify the concentration of heavy metals (Zn, Cu, As, Pb, Cd, and Hg) in the water and fish tissues of common carp (Cyprinus carpio) in the upper Mekong River and to thereby elucidate the potential dietary health risks from fish consumption of local residents. Surface water and fish tissues (gill, muscle, liver, and intestine) from four representative sample areas (influence by a cascade of four dams) along the river were analyzed for heavy metal concentrations. Results revealed that the levels of heavy metals in fish were tissue-dependent. The highest Cu and As levels were found in the liver; the highest Zn and Pb levels occurred in the intestine, and the highest Hg level was found in the muscle. The total target hazard quotient (THQ) value for residents is > 1 for long-term fish consumption, and local residents are, therefore, exposed to a significant health risk. Results from the current study provide an overall understanding of the spatial and tissue distribution of heavy metals in water and fish body along the upper Mekong River under the influence of cascade dams and highlight the potential health risk of As for the local residents of long-term fish consumption.
本研究的目的是定量分析湄公河上游水中和鲤鱼（Cyprinus carpio）组织中重金属（Zn、Cu、As、Pb、Cd 和 Hg）的浓度，从而阐明当地居民从鱼类消费中摄入重金属的潜在饮食健康风险。对来自四个具有代表性的采样区（受四座水坝梯级影响）的表层水和鱼类组织（鳃、肌肉、肝脏和肠道）进行重金属浓度分析。结果表明，鱼类体内重金属的水平与组织有关。肝脏中 Cu 和 As 的含量最高；肠道中 Zn 和 Pb 的含量最高，肌肉中 Hg 的含量最高。居民长期食用鱼类的总目标危害系数（THQ）值>1，因此当地居民面临着重大的健康风险。本研究的结果提供了在梯级大坝影响下湄公河上游水中和鱼类体内重金属的空间和组织分布的整体认识，并强调了当地居民长期食用鱼类可能面临的 As 健康风险。
