Evaluating Toxicological Properties of Claydite Gravel, Containing Ferrovanadium Production Sludge, by Method of Biotesting with the of Higher PlantsIrina Starostina, Tatyana Vasilenko, Michael Simonov and Eugene PendurinE3S Web Conf., 126 (2019) 00068DOI: https://doi.org/10.1051/e3sconf/201912600068