SS4.03 Factors Controlling the Bioavailability and Bioaccumulation of Inorganic and Organic Chemicals into Aquatic Food Chains
Date: Friday, June 14, 2002
Time: 10:30:00 AM
Location: Carson B
 
KimE, Chesapeake Biological Lab, Univ. of MD , Solomons , USA, kim@cbl.umces.edu
Mason , R, P, Chesapeake Biological Lab, Univ. of MD , Solomons , USA, mason@cbl.umces.edu
Porter , E, T, Chesapeake Biological Lab, Univ. of MD , Solomons , USA, porter@cbl.umces.edu
Soulen, H, L, Chesapeake Biological Lab, Univ. of MD , Solomons , USA, soulen@cbl.umces.edu
 
THE EFFECT OF SEDIMENT RESUSPENSION ON THE FATE AND BIOACCUMULATION OF TOTAL AND METHYL MERCURY
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In order to determine the effect of tidal resuspension on the cycling and bioaccumulation of total mercury (THg) and methyl mercury (MeHg), tidal resuspension (4 hr-on and 2 hr-off cycle) was simulated using the MEERC SToRM facility with 1000 L mesocosms. The facility can mimic both realistic bottom shear stress and water column turbulence simultaneously. Scaled populations of clams, M. mercenaeria, were added into 3 resuspension (R) tanks and 3 no resuspension (NR) tanks. Over the 25 day period, the particulate concentrations of THg and MeHg were 29.70 15.13 ng/L and 0.068 0.024 ng/L in the R tanks compared to 1.42 0.97 ng/L and 0.025 0.02 ng/L in the NR tanks reflected the differences in particulate concentrations between systems. However, the concentrations of MeHg in the clams were not significantly different between the R and NR tanks. The reasons for this, and the differences in methylation, demethylation and Hg cycling between systems will be discussed.