Aplysia Environmental Consulting, Vitoria, Brazil.
Samarco, Belo Horizonte, Brazil.
Integr Environ Assess Manag. 2020 Sep;16(5):608-614. doi: 10.1002/ieam.4291. Epub 2020 Jul 21.
On 5 November 2015, the Samarco Fe ore mining operations released approximately 50 million cubic meters of mining waste into the environment, due to a dam collapse. Aiming at understanding the potential effects on the Doce River, different regions of the course of tailings were monitored using acute and chronic ecotoxicological tests with 4 species: Ceriodaphnia dubia, Daphnia similis, Danio rerio, and Vibrio fischeri. The results showed no acute toxicity for water column organisms. However, chronic toxicity was observed with the tests with the microcrustacean C. dubia, mainly related to the physical effects of the passage of flood wave and increased suspended solids, given that toxicity was reduced after filtering the samples. The results showed different magnitudes of impact among the upper, middle, and lower Doce River, with greater impact close to the dam failure area. Integr Environ Assess Manag 2020;16:608-614. © 2020 SETAC.
2015 年 11 月 5 日，萨马科铁矿矿冶业务因大坝决堤，致使约 5000 万立方米采矿废物倾入环境。为了了解对多斯雷斯河的潜在影响，利用 4 种物种（萼花臂尾轮虫、大型蚤、斑马鱼和发光杆菌）的急性和慢性生态毒理学试验对尾矿的不同河道区域进行了监测。结果表明水柱生物无急性毒性。然而，用微甲壳类动物萼花臂尾轮虫进行的慢性毒性试验显示出毒性，这主要与洪水波的物理效应和悬浮固体增加有关，因为过滤样品后毒性降低。结果表明，多斯雷斯河的上游、中游和下游受到不同程度的影响，靠近大坝失事区域的影响更大。综合环境评估与管理 2020；16:608-614。2020 年 SETAC 版权所有。
