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RECORD NUMBER: 31 OF 190

Main Title Comparative Toxicity of Offshore and Oil-Added Drilling Muds to Larvae of the Grass Shrimp 'Palaemonetes intermedius'.
Author Conklin, P. J. ; Rao, K. R. ;
CORP Author University of West Florida, Pensacola. Dept. of Biology.;Environmental Research Lab., Gulf Breeze, FL.
Year Published 1984
Report Number EPA-R-807417; EPA/600/J-84/189;
Stock Number PB85-161537
Additional Subjects Toxicology ; Drilling fluids ; Shrimps ; Larvae ; Lethal concentration ; Oils ; Reprints ; Water pollution effects(Animals) ; Palaemonetes intermedius
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Status
NTIS  PB85-161537 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Abstract
Offshore drilling fluids (muds) varied widely in their toxicity to grass shrimp (Palaemonetes intermedius) larvae. The 96-hr LC50S for the eleven drilling muds tested ranged from 142 to >100,000 ppm (microliters/L). There was a significant correlation between oil content of the drilling muds and their toxicity. Furthermore, addition of diesel oil (No. 2 fuel oil) or mineral oil to an offshore drilling mud have a low oil content or to an oil-free synthetic drilling mud led to a marked increase in the toxicity of these muds. Thus, much of the toxicity of the offshore drilling muds tested can be attributable to the oil content.