Potential availability of trace metals in sediments in southeastern and southern Brazilian shipyard areas using the DGT technique and chemical extraction methods.

Speciation and partitioning of trace metals, from solid to solution phases of sediments, control their bioavailability and thus their potential ecological risk to organisms. Therefore, in order to obtain a broad evaluation of their risk, it is necessary to couple methodologies that are able to assess metal mobility in sediment. In this study, the Diffusive Gradients in Thin Films (DGT) technique and the application of 0.

Sulfide production and consumption in degrading wood in the marine environment.

Woody debris is known to be transported to the seas and accumulate on the seafloor, however, little is known on the consequences of its degradation in the marine environment. In this study we monitored the degradation product sulfide with Au/Hg voltammetric microelectrodes on the surface and interior of an experimentally immersed wood for 200 d. After 5 weeks of immersion, the interior became sulfidic, and steady-state conditions were established after 13 weeks with sulfide concentration reaching about 300 μM.