ekologie, kontaminace, testy akutní toxicity, těžké kovy

This study aimed to evaluate the contamination risk of selected brownfields in the Moravian-Silesian region. Presented results are based on the assessment of soil samples obtained at 16 selected profiles in the area of 4 brownfields using a battery of ecotoxicological tests including indicator organisms of various trophic levels. The ecotoxicological evaluation was also performed by contact tests and aquatic tests on aqueous leachates of soil samples. The findings were supplemented by quantitative analysis of major and heavy metals from stabilised aqueous leachates of soil samples. The Lactuca sativa root growth inhibition contact test, the Folsomia candida inhibition of reproduction and mortality test, the Sinapis alba seed germination and growth inhibition test and the luminescence test using Vibrio fischeri bacteria were used to detect acute toxicity of aqueous leachates. Based on the test results it can be concluded that all analysed samples from selected brownfield locations are somewhat toxic for indicator organisms. It was also confirmed that the telling value of aquatic ecotoxicological tests is lower than the one of contact tests. Therefore, it is suitable to prefer contact ecotoxicological tests in the assessment of substances in soil. The contamination of soil by heavy metal ions was not a major problem in analysed samples, as the ion concentrations were in the order of tenths of µg per g of soil except for samples obtained at the former Koblov Mine where a higher content of zinc ions was found