de Carvalho Gomes Franciane, Godoy José Marcus, Godoy Maria Luiza D P, Lara de Carvalho Zenildo, Tadeu Lopes Ricardo, Sanchez-Cabeza Joan Albert, Drude de Lacerda Luiz, Cesar Wasserman Julio
Programa de Engenharia Nuclear, COPPE/UFRJ, Cidade Universitária, Caixa Postal 68.509, 21945-970 Rio de Janeiro, Brazil.
Mar Pollut Bull. 2009;59(4-7):123-33. doi: 10.1016/j.marpolbul.2009.03.015. Epub 2009 Apr 14.
Three sediment cores were sampled at Sepetiba Bay and four cores at Ribeira Bay, Rio de Janeiro State, Brazil. Sediment accumulation rates and chronologies were obtained from (210)Pb activity-depth profiles. Sediment accumulation rates in Ribera Bay ranged from 1.2 mm y(-1) in the inner bay to 2.6 mm y(-1) close to its entrance. In Sepetiba Bay two sediment accumulation rates were observed: a lower rate of 0.35 cm y(-1) before the 1960s and 0.76 cm y(-1) since then. The cause of this change is due to the construction of the Santa Cecília impoundment (1955) that brings water from the Paraíba do Sul Basin into the Guandu River, which increased its flow from the original 20 m(3)s(-1) to 160 m(3)s(-1). Concentration of 44 elements was obtained by ICP-MS after total dissolution of samples from two selected cores. The relative differences between the concentrations of crustal elements, such as Al, Fe and Ti are only about 20% (p<0.05). Cd and Zn are 15 and four times larger in Sepetiba Bay than in Ribeira Bay, respectively. Other major and minor elements show lower statistically significant differences. The enrichment factors and metal inventories show that Sepetiba Bay can be considered polluted with Bi, Cd, Cr, Cu, Sb and Zn. Particularly, Cd and Zn present concentrations three and four times higher than the Brazilian existing limits.
在巴西里约热内卢州的塞佩蒂巴湾采集了3个沉积物岩芯，在里贝拉湾采集了4个岩芯。沉积物堆积速率和年代序列是通过（210）Pb活度-深度剖面获得的。里贝拉湾的沉积物堆积速率范围从内湾的1.2毫米/年到靠近其入口处的2.6毫米/年。在塞佩蒂巴湾观察到两种沉积物堆积速率：20世纪60年代以前较低，为0.35厘米/年，此后为0.76厘米/年。这种变化的原因是圣塞西莉亚蓄水坝（1955年）的建设，该水坝将南帕拉伊巴河流域的水引入关杜河，使其流量从原来的20立方米/秒增加到160立方米/秒。对从两个选定岩芯采集的样品进行完全溶解后，通过电感耦合等离子体质谱法（ICP-MS）获得了44种元素的浓度。地壳元素如铝、铁和钛的浓度相对差异仅约20%（p<0.05）。塞佩蒂巴湾的镉和锌含量分别比里贝拉湾高15倍和4倍。其他主要和次要元素在统计学上显示出较低的显著差异。富集因子和金属存量表明，塞佩蒂巴湾可被认为受到铋、镉、铬、铜、锑和锌的污染。特别是，镉和锌的含量分别比巴西现行限值高出3倍和4倍。
