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ABSTRACT
The industrial environmental “hot spots” create significant ecological hazards for terrestrial and aquatic ecosystems. Guidelines and legislation often refer to the total amount of contamination without estimating the complex relationship between the environmental factors and the toxicant. In cases of suspicion for adverse effect on the environment bio-assessment can be used as a tool to detect the presence of hazardous chemicals. Bioassays with vascular plants are considered to be universal tools of identifying the combined effects of pollutants in ecotoxicology. The purpose of this article was to evaluate the toxicological effect of plant-soil complex treated with waste water from Radomir Metal Industries, Bulgaria. The conclusion is that the sewage from the metallurgical plant Radomir Metal is used properly for irrigation of arable land. The question can be which kind of plants are suitable to be cultivated there. The effluent seems toxic for the aquatic systems and has a slight negative impact on the soil breathing and germination of treated plants. Nevertheless, in the bioassay for all examined plants a stimulating effect on the weight of roots and stems was registered under the treatment with soil extract.