Abstract
The results of studies on the assessment of the ecotoxicity of 28 heavy metals, metalloids and nonmetals by the degree of influence on the total number of bacteria in sulfur sands are presented. Soil pollution was modeled in laboratory conditions. Heavy metals and metalloids were introduced in the form of oxides at concentrations of 10 and 100 mg of the element per 1 kg of soil. The total number of bacteria was determined by direct luminescence microscopy. According to the decrease in the number of bacteria in sulfur sands with the addition of 10 mg/kg of soil, the studied chemical elements form the following sequence: Te > Se > Ag > Cr > Ge > Hg > Bi > Yb > Tl > Sn > Ni = Cd > W = Cu = Sc > Sb > Nb = Co > Y > B = Ga > Sr > Pb > V > Mo > Zn > F > Mn. The toxicity series of heavy metals, metalloids and non-metals for sulfur sands when elements are introduced at a concentration of 100 mg/kg of soil is as follows: Ag > Cr > Hg > Se > Te > Ge > Bi > Yb = Tl > W > Sn = Cd > Cu = Sc > Sb = Ni > Co > B > Nb > Y > Sr = Ga > V > Zn > Mo > Pb > F > Mn. Ag, Cr, Hg, Se, and Te showed the highest toxicity in relation to the total number of soil bacteria in sierosands.
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