Determination of chloroplatinates by CE coupled to inductively coupled plasma sector field MS |
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Authors: | Standler Alexander Koellensperger Gunda Buchberger Wolfgang Stingeder Gerhard Hann Stephan |
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Institution: | Department of Chemistry, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria. |
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Abstract: | In the present work the degradation of chloroplatinates emitted into the aquatic environment has been investigated in model studies. CE coupled to inductively coupled plasma sector field MS (ICP-SFMS) was employed as an analytical method of measurement. The CE-ICP-MS interface utilized the functional make-up flow design with a microconcentric nebulizer. Pt(Cl(4))](2-) and Pt(Cl(6))](2-) were separated within 5 min. During a measurement period of 6 h an excellent reproducibility of migration times (RSD 2.3%) could be achieved. The high sensitivity of ICP-SFMS resulted in an LOD of 80 ng/L platinum for the two compounds. External calibration using rhenium as internal standard was linear over three orders of magnitude. However, with external calibration a long-term drift of signal intensity was observed. In order to reduce the uncertainty of the obtained results, quantification of PtCl(6)](2-) was performed for the first time by species-specific on-line isotope dilution MS using (194)PtCl(6)](2-) as spike. The two different quantification strategies were compared in terms of their total combined uncertainty of measurement according to the EURACHEM guideline. The method was employed for monitoring the time-dependent degradation of Pt(Cl(4))](2-) and Pt(Cl(6))](2-) in water containing 0 and 2.8 mmol/L Cl(-) and river water. Pt(Cl(6))](2-) was stable whereas Pt(Cl(4))](2-) showed rapid degradation following pseudo first-order kinetics. |
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