Dos Reis Deyse Almeida, da Fonseca Santiago Aníbal, Nascimento Laura Pereira, Roeser Hubert Mathias Peter
Universidade Federal de Ouro Preto (UFOP), Morro do Cruzeiro, S/N, Ouro Preto, MG, 35400-000, Brazil.
Environ Sci Pollut Res Int. 2017 Mar;24(8):7456-7467. doi: 10.1007/s11356-017-8443-5. Epub 2017 Jan 22.
In developing countries, it is uncommon to find watersheds that have been the object of detailed environmental studies. It makes the assessment of the magnitude of environmental impacts and pollution of these sites difficult. This research demonstrated ways to understand the dynamics of river bottom sediments contamination, even for watersheds with a lack of environmental data. Based on geochemical affinity, we conducted a comprehensive study on the concentration of metals and metalloids. Then, we discussed the probable origin of the concentration of these elements at the bottom sediment along the Matipó River. The Matipó River is an important tributary of the Doce River, which stood out in international headlines because of the mining tailing dam disaster in Mariana, Minas Gerais, in 2015. The bottom sediment samples were taken in 25 stations located along the basin in different seasonal periods. The results showed that copper ([Formula: see text] = 464.7 mg kg) and zinc ([Formula: see text] = 287.7 mg kg) probably have natural origin, despite of the high concentrations. Lead ([Formula: see text] = 28.0 mg kg), chromium ([Formula: see text] = 153.2 mg kg), and nickel ([Formula: see text] = 41.8 mg kg) also had high concentrations at some collecting stations, and this probably reflected the local natural conditions. The bedrock of the studying basin is dominantly composed of metabasalts and metatonalites interlayered with calcitic and dolomitic metalimestone. On the other hand, the concentration was worrisome in stations near human activities, possibly due to impacts caused by unsustainably agriculture and livestock.
在发展中国家，很难找到已成为详细环境研究对象的流域。这使得评估这些地区的环境影响程度和污染情况变得困难。本研究展示了即便对于缺乏环境数据的流域，理解河底沉积物污染动态的方法。基于地球化学亲和力，我们对金属和类金属的浓度进行了全面研究。然后，我们讨论了这些元素在马蒂波河河底沉积物中浓度的可能来源。马蒂波河是多西河的一条重要支流，2015年米纳斯吉拉斯州马里亚纳的采矿尾矿坝灾难使其在国际新闻头条中备受关注。在不同季节，沿着流域的25个站点采集了河底沉积物样本。结果表明，尽管铜（[公式：见原文] = 464.7毫克/千克）和锌（[公式：见原文] = 287.7毫克/千克）浓度很高，但可能具有自然来源。铅（[公式：见原文] = 28.0毫克/千克）、铬（[公式：见原文] = 153.2毫克/千克）和镍（[公式：见原文] = 41.8毫克/千克）在一些采集站点也有高浓度，这可能反映了当地的自然条件。研究流域的基岩主要由变质玄武岩和变质英云闪长岩与方解石质和白云石质变灰岩互层组成。另一方面，在靠近人类活动的站点，浓度令人担忧，这可能是由于不可持续的农业和畜牧业造成的影响。
