... higher (P < 0.05) in beech stands compared to spruce stands, especially in the forest floor (Tables 2 and 3).Chromiume highest contents of chromium in the forest floor are found in the northern ... H2SO4, Se and H2O2 was used for determination of N, P, K, Ca, Mg, Na, followed by methods of detection: titrimetric method for N (Kjeltec, Tecator), spectrophotometry for P (Spekol ... technique (B, Zn, Mn, Fe, Al, Cu, Cr, Ni) and AAS-flame with ACT (atom concentrator tube) for Cd, Pb. Wet digestion with HNO3 and H2O2 was used for S followed by ICP-AES as the technique...