This study presents the results of the testing toxicity of the contaminated sediments from the water reservoir of Ružín No.I deposit (Slovak Republic) by using Phytotoxkit tests (MicroBioTests Inc., Belgium). The Phytotoxkit system is a screening tool used for a variety of toxicity testing applications. The advantages of this toxicity bioassay are its speed, relative simplicity and low cost compared to chemical analysis and many other biotests. Evaluation of sediments phytotoxicity was based on the testing of seed germination and the assesment of the root growth decrease of the plant Sinapis alba which allows to complete the assays after only 3 days of incubacion. Chemical analysis of the sediment samples involved determination of heavy metal (Cu, Zn, Ni, As, Sb and Hg) concentration. No potential phytotoxic effect of heavy metals in contaminated sediments was observed in the majority of tested seeds of Sinapis alba.
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