Mercury speciation in sediments of a tropical coastal environment.

摘要: The speciation of mercury in tropical coastal areas, although scarcely studied, has presented an odd behaviour when compared with the results obtained temperate environments. In this work, we measured concentrations species (mercuric mercury, methyl-mercury and dimethyl-mercury) sediments Sepetiba Bay (Brazil) these geochemical parameters. Twenty-eight sediment samples were extracted open microwave system was carried out by ethylation, cryogenic focusing, gas chromatography quartz furnace atomic absorption spectrometry. Fraction < 63 µm, organic carbon total sulphur contents redox potential order to outline characteristics sediments. While mercuric ranging between 22.65 134.61 ng g−1, ranged 2.0 4.4 g−1. Only a few dimethyl-mercury relatively high (up 14.6 g−1). result...