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Arsenic fractionation in estuarine sediments: does coastal eutrophication influence as behavior?

By Fabian Sá, Christian J Sanders, Sambasiva R Patchineelam, Eunice da Costa Machado and Ana T Lombardi

Abstract

The Paranaguá Estuarine Complex (PEC) includes the naturally oligotrophic (NO) Mel Island which is surrounded by sea grasses, a naturally eutrophic (NE) Benito Inlet adjacent to mangrove wetlands and the highly impacted eutrophic (IE) Paranaguá Bay, home of one of Brazil’s largest ports. The results from this study indicate that reactive As and pyrite increase with sediment depth near Paranaguá port in the IE region. At the NE region, near a mangrove fringe, the reactive As, Fe, Mn and pyrite remained relatively high along the sediment column while near the sea grasses at NO the As contents were low. The degree of trace metal pyritization (DTMP) and the degree of pyritization (DOP) was highest at the IE site, slightly increasing with depth. These baseline results indicate that influence of trophic conditions and presence of marine vegetation may be directly related to As behavior in coastal systems

Topics: Pyrite, Mangrove, Sea grass, Estuary, Arsenic, Environmental Sciences
Publisher: ePublications@SCU
Year: 2015
DOI identifier: 10.1016/j.marpolbul.2015.04.037
OAI identifier: oai:epubs.scu.edu.au:esm_pubs-3838
Provided by: ePublications@SCU
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