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(P423) Influence of Flow Dynamics on Perchlorate Uptake in Crawfish.
Herboldsheimer, Anna*,1, Heath, Amy1, Canas, Jaclyn1, Anderson, Todd1, Smith, Philip1, 1 The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, USA
ABSTRACT- Aquatic organisms inhabiting perchlorate-contaminated surface water bodies have been found to contain detectable concentrations of perchlorate. Crayfish samples collected from perchlorate-contaminated streams near the Naval Weapons Industrial Reserve Plant in McGregor, Texas had elevated concentrations of perchlorate compared to water and soil samples taken from the same area. This raises ecological concerns because crayfish constitute a major portion of the diet of fish, raccoons and many wading birds. The objective of this study was to determine if the uptake of perchlorate from the water column by crayfish was related to flow dynamics. Our hypothesis was that individuals exposed to flowing water containing perchlorate would demonstrate increased tissue concentrations compared to crayfish in static systems containing similar perchlorate concentrations. Crayfish (Procambarus clarkii) were exposed to a nominal concentration of 1.0 ppm sodium perchlorate in static and flow through systems for 21 days. Flow through systems were created by placing pumps with a flow rate of 0.16 gal/min in 5.5-gallon tanks. Tails and heads were collected from each crayfish and ion chromatography was used to determine the concentration of perchlorate in these tissues. There were differences in perchlorate accumulation attributable to flow dynamics. There were no differences in accumulation of perchlorate in heads, but significant differences in tail concentrations. Contrary to our hypothesis, crayfish in static systems accumulated higher tissue concentrations of perchlorate in tails than those in flow through systems.
Key words: perchlorate, crayfish, thyroid, Procambarus clarkii
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