Baptista Neto J A, Smith B J, McAllister J J
Departamento de Geologia/Lagemar, Universidade Federal Fluminense, Av. Litorânea s/n, 24210-310 Gragoatá, Niterói, RJ, Brazil.
Environ Pollut. 2000 Jul;109(1):1-9. doi: 10.1016/s0269-7491(99)00233-x.
Sixty-four surface sediment samples and seven cored samples were collected from the partially closed bay of Jurujuba Sound, an inlet of Guanabara Bay in Southeast Brazil. Analysis of metals, including Pb, Zn, Ni, Cu and Cr, shows levels consistent with those typically found in urbanised and industrialised estuarine environments. Metal enrichment is concentrated around the inshore margin of the Sound and is significantly in excess of background, geological concentrations observed in basal muds from the seven cores. In the absence of industrialisation within the steep, but limited catchment that feeds into the Sound, the metal enrichment, particularly of Pb, Zn and Cu, is ascribed to the uncontrolled discharge of untreated sewage waste and urban surface runoff. This has increased markedly since the beginning of rapid urbanisation following the linking of the area by bridge to Rio de Janeiro in 1974.
从巴西东南部瓜纳巴拉湾的一个入海口茹鲁茹巴湾（Jurujuba Sound）部分封闭的海湾采集了64个表层沉积物样本和7个岩芯样本。对包括铅、锌、镍、铜和铬在内的金属进行分析，结果显示其含量与城市化和工业化河口环境中常见的水平一致。金属富集集中在该海湾的近岸边缘，且显著超过了从7个岩芯底部泥浆中观察到的背景地质浓度。在汇入该海湾的陡峭但面积有限的集水区内没有工业化活动的情况下，金属富集现象，尤其是铅、锌和铜的富集，归因于未经处理的污水废物和城市地表径流的无控制排放。自1974年该地区通过桥梁与里约热内卢连接后快速城市化开始以来，这种情况显著增加。
