In this work the carbonized beet root was used as an adsorbent for preconcentration of chromium(VI) in aqueous solutions. The carbonized beet was separated in two particle size. Results shown that the efficiency of recovery depend on the pH as well as particle size. The best recovery efficiency was obtained at pH=2 for both particle size of 0.5-0.6 and 1- 1.1 mm in diameter. The effects of particle size, flow rate and dose of adsorbent have also studied in this work.