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Impact of an episodic event on the toxicity evaluation of a treated municipal effluent
Author(s) -
Lewis M. A.,
Eckhoff W. S.,
Cooney J. D.
Publication year - 1989
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620080911
Subject(s) - ceriodaphnia dubia , effluent , outfall , toxicity , water quality , dilution , toxicant , bioassay , toxicology , minnow , environmental science , environmental chemistry , biota , ecotoxicology , chronic toxicity , acute toxicity , chemistry , biology , environmental engineering , ecology , fish <actinopterygii> , fishery , physics , organic chemistry , thermodynamics
The chronic toxicities of a treated municipal effluent and the corresponding receiving water were evaluated for fathead minnows and Ceriodaphnia dubia in standard 7‐d toxicity tests. The effluent and river water were not significantly toxic to the fathead minnow based on measurements for survival and weight. Ceriodaphnia survival after 3 d exposure in the controls and five test concentrations ranged from 60 to 100%, but on test day 4, survival was significantly reduced at all test levels including in the controls. The toxicity was attributable to the dilution water, which was river water collected above the WWTP outfall. The toxicant(s) in the dilution water was not identified based on a comparison of the daily chemical analyses. Overall, the utilization of the receiving water for dilution water in the toxicity tests showed the potential of an episodic event to control the quality of biota in the receiving water.