Role of Sediment Resuspension on Estuarine Suspended Particulate Mercury Dynamics

Emily A Seelen, Grace M Massey, Robert P Mason

Environ Sci Technol. 2018 Jul 17;52(14):7736-7744.

PMID: 29927238

Abstract:

Coastal sediments are an important site for transient and long-term mercury (Hg) storage, and they foster a geochemical environment optimal for Hg methylation. Therefore, efforts have been taken to constrain the role of sediments as a source of methylmercury (MeHg) to the estuarine water column. This study employed the Gust Microcosm Erosion Core system capable of quantifying particle removal from undisturbed cores under measurable shear stress conditions to assess particulate Hg and MeHg exchange between sediments and the water column. Samples were collected from organic-rich and organic-poor sediment types from the mid- and lower Delaware Bay. It was found that bulk sediment samples from organic-rich systems overpredict total Hg and MeHg release to the water column, whereas organic-poor sediments underpredict the exchange. In general, organic-rich sediments in shallow environments have the most impact on surface particle dynamics. There is little evidence to suggest that MeHg formed in the sediments is released to the water column via particulate exchange, and therefore, nonsedimentary sources likely control MeHg levels in this estuarine water column.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
CS3104392	Estuarine sediment (total Hg and methylmercury)			Price