Acute toxicity screening of reservoir water and sediment using rotifers (Rotox(reg sign)) and light emitting bacteria (Microtox(reg sign)), reservoir vital signs monitoring, 1991

摘要

Toxicological screening of reservoir sediments (porewater or interstitial water) and reservoir water (collected three meters above the sediments) was initiated in fourteen Tennessee River mainstem impoundments during the summer of 1990 as part of TVA's Reservoir Vital Signs monitoring. Twenty-four stations representing transition-zone and forebay reservoir habitats were identified for study. Toxicity test methods evaluated acute response of the freshwater rotifer Brachionus calyciflorus (Rotox(trademark)) and the light emitting bacterium Photobacterium phosphoreum (Microtox(trademark)). The second series of Vital Signstoxicity biomonitoring tests was conducted during the summer of 1991. Results of this study indicated toxicity at several locations. The Vital Signs Reservoir Monitoring project allows several years of testing to establish toxicity baseline data and identify trends. Comparison of results from the first two years of testing show that Wilson Reservoir forebay (TRM 260.8) and Nickajack Reservoir forebay (TRM 425.5) bothexhibited mild toxicity to Microtox(trademark) in 1990 and toxicity to rotifers in 1991. No other stations exhibited toxicity both years.