||Comparison of Microbial Bioassays for the Detection of Aquatic Toxicants.
McFeters, G. A. ;
Bond, P. J. ;
Olson, S. B. ;
Tchan, Y. T. ;
||Montana State Univ., Bozeman. Dept. of Microbiology. ;Sydney Univ. (Australia).;Corvallis Environmental Research Lab., OR.
Water pollution ;
Aquatic animals ;
Toxic substances ;
Water pollution effects(Animals)
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The toxicity of 35 test chemicals was analyzed using two microbial bioassay systems. The commercially available Microtox Toxicity Analyzer System and the two-organism procedure of Tchan were used to determine the concentration of test chemicals resulting in a 50 percent reduction in response EC(sub 50). Both of the test employed a luminescent bacterium while the procedure of Tchan also utilized a alga. Results from the two microbial tests were compared with available data obtained with fish toxicity bioassays and with each other. As a notable exception, photosynthesis-inhibiting herbicides were detected at remarkably lower concentrations with the procedure of Tchan than any of the other bioassays. Potential applications for these tests are discussed.