||Acute Toxicity of Two Generic Drilling Fluids and Six Additives, Alone and Combined, to Mysids ('Mysidopsis bahia').
Parrish, P. R. ;
Macauley, J. M. ;
Montgomery, R. M. ;
||Environmental Research Lab., Gulf Breeze, FL. ;Technical Resources, Inc., Gulf Breeze, FL.
Drilling fluids ;
Water pollution ;
Mathematical models ;
Water base muds ;
Mysidopsis bahia ;
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Toxicity tests were conducted with two laboratory-prepared generic drilling fluids (muds) and six commonly used drilling fluid additives to determine their toxicity, alone and combined, to mysids (Mysidopsis bahia). In 25 tests, the acute toxicity of combinations of one, two, or three of the drilling fluid additives mixed with either drilling fluid was less than the toxicity predicted from the empirical 96-h LC50s for drilling fluid additive(s) and/or drilling fluid alone; the observed 96-h LC50s of the mixtures were from 1.3 to 23.6 times the values predicted from the presumption of additive toxicity.