Laboratório de Ecologia Aquática, Programa de Pós-Graduação em Ecologia, Universidade Federal de Juiz de Fora, Juiz de Fora, 36036-900, Brazil.
Department of Environmental Science and Analytical Chemistry, Stockholm University, 106-91, Stockholm, Sweden.
Bull Environ Contam Toxicol. 2019 Aug;103(2):292-301. doi: 10.1007/s00128-019-02668-0. Epub 2019 Jun 26.
Reservoir sediment can work as both sink and source for contaminants. Once released into the water column, contaminants can be toxic to biota and humans. We investigate potential ecological risk to benthic organisms by metals contamination in six reservoirs in Southeast Brazil. Results of the bioavailable fraction of copper (Cu), chromium (Cr), cadmium (Cd), lead (Pb), zinc (Zn), and iron (Fe) in sediment samples are presented. Considering Cu, Cd, and Zn concentrations, about 6% of the samples exceeded the threshold effect levels of sediment quality guidelines. The comparison to sediment quality guidelines is conservative because we used a moderate metal extraction. Control of contaminant sources in these reservoirs is key because they are sources of water and food. The mixture toxicity assessment showed an increased incidence of toxicity to aquatic organisms showing that mixture toxicity should be taken into account in sediment assessment criteria.
水库沉积物既是污染物的汇，也是污染物的源。一旦释放到水柱中，污染物对生物和人类可能具有毒性。我们通过对巴西东南部六个水库的沉积物中金属污染情况的研究，来调查潜在的对底栖生物的生态风险。我们对沉积物样本中可利用的铜（Cu）、铬（Cr）、镉（Cd）、铅（Pb）、锌（Zn）和铁（Fe）的分数进行了研究。就 Cu、Cd 和 Zn 的浓度而言，约有 6%的样本超过了沉积物质量准则的阈值效应水平。与沉积物质量准则的比较是保守的，因为我们使用了温和的金属提取方法。控制这些水库中的污染物来源至关重要，因为它们是水和食物的来源。混合物毒性评估显示，水生生物的毒性发生率增加，这表明在沉积物评估标准中应考虑混合物毒性。
