Chemistry Department, Pontifical Catholic University of Rio de Janeiro, Rua Marques de São Vicente 225, Gávea, Rio de Janeiro 22451-900, RJ, Brazil.
Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense, Av. Alberto Lamego 2000, Parque Califórnia, Campos dos Goytacazes, RJ 28.013-602, Brazil.
Mar Pollut Bull. 2018 Oct;135:1158-1163. doi: 10.1016/j.marpolbul.2018.08.053. Epub 2018 Sep 1.
The present study has evaluated temporal and spatial mercury trends based on surficial sediment samples and Pb-dated sediment profiles. The obtained results show that there are areas close to the main bay's tributary rivers where the Hg content has doubled during the last 15 years and regions where it has decreased by a factor of 2, mainly the area close to the navigation channel, which is submitted to periodic dredging. In the inner part of the bay, the most contaminated region, mercury shows a strong association with sulfide. In the same region, based on the Pb results, it was possible to calculate the yearly increment on the Hg concentration in the surface sediment, 0.62 μg kg y to 0.29 μg kg y, according to the distance to the bay's main tributary rivers.
本研究通过表层沉积物样本和 Pb 定年的沉积物剖面评估了汞的时空变化趋势。结果表明，在靠近主海湾支流的区域，过去 15 年中汞含量增加了一倍，而在靠近航道的区域，汞含量减少了一半，该区域定期进行疏浚。在海湾内部，受污染最严重的区域，汞与硫化物密切相关。同样在这个区域，根据 Pb 的结果，根据距离主海湾支流的远近，可以计算出表层沉积物中汞浓度的年增量，从 0.62μgkg y 到 0.29μgkg y。
