Grupo de Ecologia Bentônica, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil.
Escola Superior de Agricultura Luiz Queiroz, Departamento de Ciência do Solo, Universidade de São Paulo, São Paulo, Brazil.
Integr Environ Assess Manag. 2020 Sep;16(5):655-660. doi: 10.1002/ieam.4250. Epub 2020 Mar 20.
The rupture of a mining dam in southeastern Brazil in 2015 was the country's greatest environmental tragedy. In order to evaluate the ecological risks of the mine tailings on the Rio Doce estuary, this study assessed trace metal contamination and sediment quality indices up to 2.9 y after the dam rupture. Surface sediments were collected from 17 stations on the Rio Doce estuary and Cd, Pb, Cr, Zn, Cu, and As concentrations were determined by inductively coupled plasma atomic emission spectroscopy (ICP-OES). Four ecological risk indices (modified contamination degree [mCd], pollution load index [PLI], risk index [RI], and sediment quality guideline quotient [SQG-Q]) suggest a high risk by metal contamination with possible adverse biological effects, with moderate seasonal variability. Based on a precautionary approach, our results support fisheries closures and the need for public health monitoring in the affected areas, and support other studies that suggest chronic metal contamination of the Rio Doce estuary. Integr Environ Assess Manag 2020;16:655-660. © 2020 SETAC.
2015 年，巴西东南部一座采矿大坝的决堤是该国最大的环境灾难。为了评估尾矿对里奥杜西河口的生态风险，本研究在大坝决堤后长达 2.9 年的时间里评估了痕量金属污染和沉积物质量指数。从里奥杜西河口的 17 个站点采集了表层沉积物，并通过电感耦合等离子体原子发射光谱法（ICP-OES）测定了 Cd、Pb、Cr、Zn、Cu 和 As 的浓度。四个生态风险指数（修正污染程度[mCd]、污染负荷指数[PLI]、风险指数[RI]和沉积物质量指导值商[SQG-Q]）表明，金属污染存在高风险，可能产生不利的生物影响，且存在季节性的中度变化。基于预防原则，我们的研究结果支持在受影响地区关闭渔业和进行公共卫生监测，并支持其他表明里奥杜西河口存在慢性金属污染的研究。《综合环境评估与管理》2020 年；16：655-660。版权所有 2020 SETAC。
