In this study level of soil contamination by polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) in two oil refineries in Vojvodina region of Serbia was assessed using combined bio/chemical approach. Toxicity of the samples, determined by microEROD analysis, could not be exclusively attributed to the content of measured PCBs and PAHs, but also to the presence of unknown dioxin-like compounds (DLC), and/or positive interactions among similarly acting chemicals. The results proved that biotests, when applied in ecotoxicological assessments, should be used either as a screening tool or initial step in effect-directed analyses.
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