Kong Ming, Hang Xiaoshuai, Wang Longmian, Yin Hongbin, Zhang Yimin
Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, 8 Jiangwangmiao Street, 210042 Nanjing, China E-mail:
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing, China.
Water Sci Technol. 2016;73(1):203-14. doi: 10.2166/wst.2015.483.
Accumulation and risk assessment of metals in sediments and zoobenthos (Bellamya aeruginosa and Corbicula fluminea) from Lake Taihu were studied. Results showed that metal (Cr, Cd, Cu, Zn, Pb and Ni) concentrations in Lake Taihu varied greatly, and Cd in the Zhushan Bay showed higher bioavailability compared to the other metals studied. The spatial distribution of metals in B. aeruginosa and C. fluminea was similar to that in sediments. Zn and Cu exhibited the higher mean concentration in B. aeruginosa and C. fluminea, which was in good accordance with its higher content in surrounding sediment. Labile fractions (i.e., acid-soluble (F1), reducible (F2) and F1+F2) of Cu and Zn in sediments showed a significant positive correlation with them in B. aeruginosa (P<0.01); no correlation relationship was found for metals (Cd, Cr, Cu, Zn, Pb and Ni) between in the tissue of C. fluminea and in sediments. The results of ecological risk assessment showed that Zhushan Bay was seriously contaminated by metal Cd, as it made the main contribution of all the metals. Total target hazard quotients indicated that adults and children both had potential health risk through consuming C. fluminea. Hazard index values suggested that adults and children might experience adverse health effects through consuming B. aeruginosa and C. fluminea.
研究了太湖沉积物和底栖动物（铜锈环棱螺和河蚬）中金属的积累及风险评估。结果表明，太湖中金属（铬、镉、铜、锌、铅和镍）的浓度差异很大，与所研究的其他金属相比，竺山湾中的镉具有更高的生物有效性。铜锈环棱螺和河蚬中金属的空间分布与沉积物中的相似。锌和铜在铜锈环棱螺和河蚬中的平均浓度较高，这与其周围沉积物中较高的含量相符。沉积物中铜和锌的不稳定组分（即酸溶态（F1）、可还原态（F2）和F1+F2）与铜锈环棱螺中的这些组分呈显著正相关（P<0.01）；河蚬组织中的金属（镉、铬、铜、锌、铅和镍）与沉积物中的金属未发现相关关系。生态风险评估结果表明，竺山湾受到金属镉的严重污染，因为镉对所有金属的污染贡献最大。总目标危害商表明，成年人和儿童通过食用河蚬均有潜在健康风险。危害指数值表明，成年人和儿童通过食用铜锈环棱螺和河蚬可能会出现健康不良影响。
