Two burrowing species, the estuarine euryhaline amphipod Grandidierella sp. and the marine mollusc Paphies elongata, were used for the development of marine sediment re-worker toxicity tests. Acute static toxicity tests were performed on these species at 25ЊC with reference toxicants in a ( ) water phase or drilling fluids in a sediment phase. The 96-h 50% lethal concentration LC of cadmium 50 for Grandidierella sp. was 0.95 mg/ L. The mean 10-d LC of hexavalent chromium for Grandidierella 50 sp. in six independent tests was 1.40 mg/ L with a coefficient of variation of 24%. The average 96-h LC 50 ( ) value for P. elongata was 32.1 mg Cr VI / L. The 10-d LC values for Grandidierella sp. exposed to 50 drilling muds based on synthetic paraffin, iso-olefin, and ester fluids were in the range of 200 -1500 mg/ kg. The 5-d LC values of the same paraffin and iso-olefin drilling muds for P. elongata were 50 greater than 20,000 mg/ kg. The high sensitivity and response reproducibility of Grandidierella sp. in toxicity bioassays, under tropical conditions, demonstrated the suitability of this local sediment re-worker species for drilling mud toxicity testing in Western Australia. ᮊ
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