CHROMATOGRAPHIC UTILITY OF SORPTION BEHAVIOR OF SOME OXY-ANIONIC SPECIES ON HCLO4-TREATED ALUMINA

Chromatographic Brockmann alumina was pretreated with perchloric acid of different strengths and samples having surface-phase pH 1.0-9.0 wer e prepared. Sorption-desorption studies of MnO4-, VO3- and CrO42- ions were carried out from aqueous solutions under varying experimental co nditions. The sorption of the oxy-anions was pH-dependant, fast and al most athermic (30-60-degrees). Desorption efficacy and retarding influ ence on adsorption was PO43- > SO42- > NO3-. Batch operation method wa s used to determine K(d) and K(D). The V(R) and V(T) values were emplo yed in the column chromatography of the oxy-anions. Ion-exchange and w eak chemical interactions appear to control the sorption process.