Abstract
Acute toxicity of drilling muds is measured in the U.S. by the mysid shrimp test. Drilling muds that fail the test cannot be discharged into the Gulf of Mexico, and such muds and their cuttings must be brought onshore for disposal. Discharge of water-based muds that pass the test is permitted in most instances. Because of the economic implications associated with hauling cuttings and fluids, a model that predicts test results on the basis of mud composition is clearly desirable. This paper focuses on the modeling of mysid shrimp test data. European laboratories use different test species and procedures. It seems plausible to expect, however, that the line of reasoning used here could apply to the modeling of aquatic data on other test species once a sufficient quantity of such data becomes available.
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