Toxicity of Vanadium to Hyalella Azteca in Freshwater Sediment

ecotoxicology;aquatic;restoration;mining;Natural Resources and Environment

Bennett, BrittanyWiley, Mike ;

University of Michigan

关键词: ecotoxicology;    aquatic;    restoration;    mining;    Natural Resources and Environment;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/117586/BrittanyBennett_Thesis_Final%20%20%281%29.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Lake Catherine is a reservoir located downstream of a historic mine near Hot Springs,Arkansas. The reservoir has received inputs of a range of metals associated with mining,including vanadium (V). The toxicity of V in freshwater sediments is poorly understood. In orderto evaluate the success and potential need for continuing remediation efforts in Lake Catherine, atoxicity threshold for V needs to be established. This study evaluated the toxicity of V tolaboratory cultured Hyalella azteca, a species commonly used in sediment toxicity tests. H.azteca were exposed to V spiked sediments and site sediments from Lake Catherine, with wholesediment V concentrations ranging from 0 ug/g dw to over 2000 ug/g dw. Mortality and growthwere assessed following a 28-day chronic toxicity test to establish lethal and effectconcentrations.Mortality was the only endpoint with significant results in the spiked sediment tests,resulting in a sediment V LC50 of 742 ug/g and a pore water V LC50 of 1870 ug/L. Pore waterwas the best predictor of total V and V+5 bioaccumulation in H. azteca for spiked sediments (r2 =0.8949 and 0.8934, respectively). Significant toxicity was not observed with site sedimentexposure to H. azteca. These results suggest that V toxicity occurs due to pore water exposure.Further, the results suggest that Lake Catherine is not toxic to H. azteca, despite the sedimentshigh V concentrations.