生态与农村环境学报2019，Vol.35Issue(2)：180-188,9.DOI:10.19741/j.issn.1673-4831.2018.0078
成都市部分区域淡水混养池塘水体与沉积物中重金属风险评价及分配特征
Risk Assessments and Partition Characteristics of Heavy Metals in Water and Sediments of Freshwater Polyculture Ponds in Partial Areas of Chengdu City
摘要
Abstract
In order to survey the partition characteristics and potential ecological risks of heavy metals in environment of freshwater polyculture ponds in partial areas of Chengdu City, the concentration of six heavy metals (Cu, Zn, Cd, Pb, Cr, Ni) in water and sediments of 10 sampling sites were detected. BCR sequential extraction method was used to analyze the speciation of six heavy metals, and the potential risks of heavy metals were evaluated. The results show that, the annual average concentration of heavy metals in water were up to the Fishery Water Quality Standards, except the concentration of Zn in S8 and S10 sites. The heavy metal concentrations in spring and summer seasons were higher than those in autumn and winter seasons. The annual average concentration of heavy metals in sediments were up to the ERL (effects range-low) standards, except the concentration of Cu in S3、S4 and S8 sites. The Cd in sediments had the highest potential risk. There was no obvious seasonal variation in heavy metal concentrations in sediments. The ratio of weak acid extractable fraction of Cd (22. 91％-64. 51％) was the highest among all the heavy metals. The reducible fraction of Pb and Cu occupied a large proportion. Zn mainly dominated in residual fraction, with a larger proportion of weak acid extractable fraction and reducible fraction. Cr and Ni were dominated in residual and oxidizable fraction. The order of partition coefficient of heavy metals in water-sediments was Ni＞ Pb＞ Cr＞ Cu＞ Cd＞ Zn. Therefore, the pollution control of Cd in freshwater polyculture ponds of Chengdu City should be strengthened.关键词
成都市/淡水混养池塘/重金属/分配系数/生态风险Key words
Chengdu City/freshwater polyculture pond/heavy metal/partition coefficient/ecological risk分类
资源环境引用本文复制引用
霍庆霖,肖慧,王俊杰,董袁媛,张雨豪,王丹,程章,张世熔,徐小逊..成都市部分区域淡水混养池塘水体与沉积物中重金属风险评价及分配特征[J].生态与农村环境学报,2019,35(2):180-188,9.基金项目
国家自然科学基金(21507095) （21507095）
四川省教育厅重点项目(17ZA0302) （17ZA0302）
