%0 conference paper,conference lecture,GKSS report %@ %A Prange, A.,Fanger, H.-U.,Niedergesaess, R. %D 1990 %J 3. Magdeburger Gewaesserschutzseminar: Zur Belastung der Elbe; Tagungsbericht %N %P 305 %T Investigations of trace element variations in the Elbe estuary using TXRF and INAA %U %X