| Abstrakt: |
The concentrations of macrocomponents (Na, K, Mg, Ca, and P) and trace elements (Rb, Cs, Be, Sr, Ba, Mn, Fe, Co, Ni, Cu, Zn, Pb, Cd, Ag, Sn, Sb, Al, Ga, rare earth elements, Ti, Zr, Hf, Th, U, Nb, Ta, B, V, Cr, Ge, As, Mo, and W) were measured in 12 macrophyte species selected in the freshwater part of the Volga mouth area. Close correlations between the average specific contents were established: (a) most of the studied trace elements, which confirms the phenomenon of group concentration found earlier for heavy metals and chromium; (b) magnesium, calcium, and trace elements capable of their isomorphic substitution; (c) the typically biogenic elements potassium and phosphorus. A regular increase in the concentrations of trace elements and, to a lesser extent, of magnesium and calcium was found in the series "helophytes → large-leaved hydrophytes → variegate-leaved hydrophytes → small-leaved hydrophytes, including hydrophytes completely immersed in water," which corresponds to an increase in the effective surface area of plants in the aquatic environment. [ABSTRACT FROM AUTHOR] |
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