Collect. Czech. Chem. Commun. 1997, 62, 1029-1042

HPLC of Platinum Metals and Gold Based on Their Bromo Complexes

Josef Doležal and Lumír Sommer

Department of Analytical Chemistry, Masaryk University, 611 37 Brno, Czech Republic


PtII,IV, PdII, and AuIII can be separated and quantitated by HPLC in the form of ion-associates of their bromo complexes with the cetyltrimethylammonium (CTMA) cation, using the acetonitrile-water 60 : 40 system containing 0.002 mol l-1 CTMA and 0.05 mol l-1 NaBr (pH 3) as the mobile phase and detection at 240 nm. In such circumstances the detection limits for the injection of 20 μl sample are 6.7, 0.4, 0.9, and 4.3 ng for PtII, PtIV, PdII, and AuIII, respectively. Excess Fe3+, Al3+, Mg2+, Ca2+, NO3-, SO42-, and Cl- does not interfere. On-line preconcentration of the PtII,IV bromo complexes on Separon SGX RPS is recommended.

Keywords: Chromatography; Platinum metals; Gold; Bromo complexes; Preconcentration.