A novel method was investigated using chemically pretreated orange peel (POP) powder to separate and pre-concentrate Cr(III) in environmental water. In this study, the raw orange peel was pretreated with petroleum ether-NaOH and employed as selective sorbent for the separation of Cr(III) ions in the presence of Cr(VI). The influences of pH, sample flow rate, elution concentration and volume, and breakthrough volume were investigated in detail. Cr(III) was selectively adsorbed on the microcolumn packed with POP in the pH range from 3.5 to 5.5, w...
