PLATINUM SPECIATION WITH HYPHENATED TECHNIQUES - HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY AND CAPILLARY ELECTROPHORESIS ONLINE COUPLED TO AN INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETER - APPLICATION TO AQUEOUS EXTRACTS FROM A PLATINUM TREATED SOIL

1. An on-line hyphenation of reversed phase high-performance liquid ch romatography (RP-HPLC) with inductively coupled plasma-mass spectromet ry (ICP-MS) is applied, using an ultrasonic nebuliser combined with a membrane desolvator as the interface. Thus, organic solvents (e.g. met hanol, hexane) or gradients (e.g. methanol/water) as well as aqueous N aHCO3/NaCl mixtures can be directly used without influence on the plas ma. The high resolution power of HPLC enables the separation of Pt-spe cies, whereas ICP-MS is taken for element specific detection with low detection limits. 2. Additionally, a powerful on-line coupling of capi llary electrophoresis (CE) and ICP-MS [1, 2] was used for platinum spe ciation in parallel. With these two methods, independent from each oth er, first characterisation is achieved about the nature of Pr species formed by interaction with a soil. Aqueous extracts of a clay-like hum ic soil, treated with a Pt contaminated tunnel dust and Pt model compo unds [3] were examined to elucidate transformation processes of Pt-spe cies in a soil.