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|Title:||Risk of pore water hydrogen sulfide toxicity in dredged material bioassays|
|Authors:||Dredging Operations Technical Support Program (U.S.)|
Sims, Jerre G.
Moore, David W.
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: Generally, hydrogen sulfide is not treated as a contaminant of concern in the regulatory evaluation of dredged material since it undergoes rapid oxidation and dilution during dredging and disposal. However, because dredged material is evaluated using effects-based testing (i.e., whole sediment and elutriate toxicity tests), there is the potential for H2S to exert toxicity arid confound the regulatory decision-making process. To evaluate the potential for hydrogen sulfide toxicity in dredged material bioassays, a literature review and survey to U.S. Army Corps of Engineers Divisions and Districts were conducted. Data included (A.) reported environmental pore water exposure concentrations of hydrogen sulfide and (B.) effects concentrations shown to cause toxicity in laboratory studies with aquatic species. While the majority (>60 percent) of reported environmental pore water concentrations were > 100 mM H2S/l, almost all (90 percent) of reported effects were found at concentrations <100 μM H2S/l. This simple comparison of reported exposure and effects concentrations suggests that there is a strong potential for hydrogen sulfide toxicity in dredged material bioassays. However, a number of biases in this limited data set are discussed that must be considered before any definitive conclusions can be drawn.
|Appears in Collections:||Miscellaneous Paper|