Evaluation of Toxic Effects of Oil-base Drilling Fluids Upon the Soil by Means of Various Biotesting Methods
Simulation experiments were carried out in order to evaluate the toxicity of the soil polluted by oil-base drilling fluids and their components: mineral oils and surfactants. The results of phyto-testing and vermitesting check, and also the dehydrogenase activity data of microbial strain Dietzia maris AM3 show that the high level of toxicity of oil-base drilling fluids is caused by the compound effect of the components thereof. A considerable correlation between the results received by the three different biotests conducted in vivo in the representatives of the basic trophic levels of soil biogeocenose was established; the worthwhileness of applying of complex biotests for performing the best evaluation of toxic effects of soils pollutants was proved.