title: Determination of clodronate in aqueous solutions by HPLC using postcolumn derivatisation.
abstract: A method for the determination of clodronate at ppm levels in aqueous solutions by HPLC is presented. Clodronate is first separated by anion exchange chromatography using a solution of nitric acid and sodium nitrate as eluent. Th-EDTA-XO mixed ligand complex is used as a postcolumn reagent for clodronate. Clodronate reacts quantitatively with this complex in slightly acid solutions, and a change in the absorbance of Th-EDTA-XO is used as a measure for the clodronate concentration. The detection limit is about 3 ppm, and the linear dynamic range of the method extends up to about 200 ppm. The RSD values varied between 5 and 16%. The effect of pH on appearance and retention of different forms of clodronate is studied. Different forms of clodronate can be separated and detected in the used anion-exchange system.
authors.affiliation: Department of Chemistry, University of Oulu, Linnanmaa, SF-90570, Oulu, Finland.
authors.forename: V
authors.initials: V
authors.lastname: Virtanen
authors.forename: L H
authors.initials: LH
authors.lastname: Lajunen