Toxic effect of invert emulsion drilling fluids and their disperse mediums on soil
Using three biotesting methods (phyto-testing, vermi-testing and in terms of the activity of the dehydrogenases of Dietzia maris AM3) toxic effect of invert-emulsion drilling fluids and their disperse mediums on soil was investigated. High level of toxicity of soil, contaminated with hydrocarbon based drilling fluids, was established. Among the studied pollutants minimal toxicity of mineral oil and drilling fluid based on mineral oil was detected.