Speciation of inorganic platinum-chloride complexes in spiked environmental samples by SPE and ICP-AES.

A method for the separation of tetrachloroplatinate PtCl(4)(2-), and hexachloroplatinate PtCl(6)(2-), by solid-phase extraction, using a Dowex 1x10 anion exchange resin is proposed. The sequential elution and separation of PtCl(4)(2-), and PtCl(6)(2-) is achieved using selective complexing agents. The eluates, containing Pt(II) and Pt(IV) were analyzed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Recoveries of 102% for PtCl(4)(2-) and 94% for PtCl(6)(2-) and detection limit of 15 ng g(-1) were achieved. Using this method determination of Pt(II) and Pt(IV) in soil samples, spiked with different platinum species was performed. The comparison with GFAAS determination showed a very good agreement.