Key Laboratory of Freshwater Aquaculture and Enhancement of Anhui Province, Fisheries Research Institute, Anhui Academy of Agricultural Sciences, Hefei, 230001, Anhui, China.
School of Resources and Environment, Anhui Agricultural University, Hefei, 230001, Anhui, China.
Chemosphere. 2019 Mar;218:1122-1130. doi: 10.1016/j.chemosphere.2018.10.107. Epub 2018 Oct 22.
Chaohu Lake is one of the five largest freshwater lakes in China situated in Anhui Province. Water, sediment and aquatic organisms were collected from Chaohu Lake. Trace metals were measured to investigate their bioaccumulation pattern and trophic transfer in the food web as well as potential health risk assessment through fish consumption. Trophic interactions were investigated by stable nitrogen isotope. Linear regression of log metal concentration versus δN was used to determine whether there is biomagnification or biodilution. Results showed that concentrations of trace metals in water were rather low except Hg, some of which surpassed the scope of quality standard. Trace metals in sediment exceeded background values nevertheless within the range for the protection of aquatic life. Therein, geochemical fractionation showed that Cd would pose a considerable potential ecological risk. Trace metals were higher in plankton except for Cu and Zn was higher in shrimp due to metabolic needs. Decreasing trend was observed in Pb, Cr, Cd, As and Hg levels with increasing trophic level whereas increasing trend was observed in Zn. Trace metals in fish were lower than legislation thresholds except for Cr in two samples that exceeded the threshold value. Nonetheless, total target hazard quotient values and target cancer risk were lower than unit and within acceptable range, indicating there was no health risk for inhabitants from trace metals through fish consumption.
巢湖是中国五大淡水湖之一，位于安徽省。本研究从巢湖采集了水、沉积物和水生生物样本，测定了痕量金属在这些样本中的含量，以探究其在食物网中的生物累积模式和营养级传递，以及通过鱼类消费进行的潜在健康风险评估。通过稳定氮同位素研究了营养相互作用。通过线性回归分析 log 浓度与 δN，确定是否存在生物放大或生物稀释。结果表明，除汞外，水中痕量金属的浓度相当低，部分金属浓度超过了质量标准的范围。尽管如此，沉积物中的痕量金属仍超过了水生生物保护的背景值，其中 Cd 的地球化学形态表明其具有相当大的潜在生态风险。浮游生物中的痕量金属含量高于其他样本，除了 Cu 和 Zn，因为它们是代谢所必需的。随着营养级别的增加，Pb、Cr、Cd、As 和 Hg 的含量呈下降趋势，而 Zn 的含量呈上升趋势。除了两个样本中的 Cr 超过了阈值，鱼类中的痕量金属含量低于法规阈值。然而，总目标危害系数值和目标癌症风险均低于单位值且处于可接受范围内，这表明居民通过鱼类消费摄入痕量金属不会产生健康风险。
