Major elements as possible factors of traceelement urban pedochemical anomalies

摘要

The relationship between real total contents of the major elements Na, Mg, Al, Si, P, S, K, Ca, Ti, Fe and the trace elements Ag, As,B, Ba, Co, Cr, Cu, Mn, Mo, Ni, Pb, Sb, Se, Sn, V, U, Zn in topsoil from the central par t of Vilnius is analysed. The amounts of mostelements were determined by energy-dispersive X-ray fuorescence, while amounts of Ag, B, Co were measured by optical atomicemission spectrophotometry. Two factors were distinguished according to major elements: anthropogenic (A) including Ca, Mg, Fe,P, S and clayey (C) including K, Al, Ti. Boron, Mn, Cr and U are signifcantly correlated with members of both factors, Sb withnone of them and other trace elements either with all (Cu, Zn, Pb, Se, Ba, Ni, Co) or with separate (V, Ag, Sn, Mo, As) membersof the A-factor. Only B, Mn, Cr, U (par tly their additive index Z1) are infuenced by the C-factor, while twelve other trace elements(also their additive index Z2) are infuenced by the A-factor. The additive index Z of all 17 elements is also affected by the A-factor.Four groups of sites have been distinguished according to normal or higher contents of both factors. The majority of trace elementanomalies are related to the sites affected by the A-factor.