Abstract
Ashworth, J. and Symonds, C. 2013. Simplified Microtox ® bioassay for drilling waste disposal on lease soils in Alberta. Can. J. Soil Sci. 93: 109–111. The Microtox bioassay is specified in regulations governing drilling waste disposal in western Canada. Traditionally, four serial dilutions of waste-derived fluid are tested, to bracket the regulatory Pass threshold concentration. We find that an equally valid Pass/Fail result can be obtained from one test at the threshold concentration. The simplified method has labour and cost-saving advantages.
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