摘要：The content and profile distribution of chromium in exchangeable (F1), reducible (F2), oxidiz- able (F3) and residual (F4) fractions, separated according the BCR sequential procedure in the sandy arable Brunic Arenosols of the middle-east part of Poland was examined. Natural content of chromium was found, and its profile distribution resulted from the abundance of the sandy parent material, and a degree of advancement of the dynamic lithogenic and pedogenic processes in soils environment. Mean total content of Cr (mg⋅kg~(-1)) in genetic horizons is presented by the following series of decreasing values: Bv (7.2) > BC (6.2) > Ap (5.7) > C (3.6). Mean percentage of Cr in fractions separated with the BCR method is presented by the following series of decreasing values: F4 (65.558.8) > F3 (14.4-21.0) > F2 (12.9-14.3) > F1 (5.87.4) in Ap and Bv horizons and F4 (84.1-94.1) > F2 (3.3-8.6) > F3 (1.5-8.6) > F1 (1.1-2.1) in BC i C horizons. The most Cr in the exchangeable fraction F1 and oxidizable F3 was found in the hunus horizons (Ap); reducible F2 - on the enrichment horizon (Bv); residual F4 - on the parent material horizon (C). The profile contribution of F1, F2 and F3 fractions of chromium decreased, in general, with soil depth, and fraction F4 - increased with soil depth. The statistical calculations demonstrated the significant impact of the selected properties (pH, CEC, Corg, granulometric composition) of the investigated soils (especially in Ap horizon) on the content of chromium in the extracted fractions.
