Gel Electrophoresis Coupled to Inductively Coupled Plasma-Mass Spectrometry Using Species-Specific Isotope Dilution for Iodide and Iodate Determination in Aerosols

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• 作者：Wolfram Brü ; chert ; Andreas Helfrich ; Nico Zinn ; Thomas Klimach ; Markus Breckheimer ; Hongwei Chen ; Senchao Lai ; Thorsten Hoffmann ; Jö ; rg Bettmer
• 刊名：Analytical Chemistry
• 出版年：2007
• 出版时间：February 15, 2007
• 年：2007
• 卷：79
• 期：4
• 页码：1714 - 1719
• 全文大小：166K
• 年卷期：v.79,no.4(February 15, 2007)
• ISSN：1520-6882

文摘

In this paper, we present an online coupling of gelelectrophoresis (GE) and inductively coupled plasma-mass spectrometry (ICP-MS) for the determination ofiodine species (iodide and iodate) in liquid (seawater) andaerosol samples. For the first time, this approach isapplied to the analysis of small molecules, and initialsystematic investigations revealed that the migrationbehavior as well as the detection sensitivity stronglydepends on the matrix (e.g., high concentrations ofchloride). These effects could consequently affect theaccuracy of analytical results, so that they need to beconsidered for the analysis of real samples. The techniqueused for quantification is species-specific isotope dilutionanalysis (ssIDA), which is a matrix-independent calibration method under certain conditions. We demonstratethat the use of ¹²⁹I-enriched iodide and iodate allows thecorrection of the impact of the matrix on both, theelectrophoretic migration and the detection sensitivity ofthe ICP-MS. After optimization, this coupling offers anovel and alternative method in the analysis of iodinecompounds in various matrices. Here, we demonstratethe analytical capability of the technique for the chemicalcharacterization of marine aerosols. The results show thepresence of iodide and iodate at the ng m^-3 and sub-ngm^-3 level in the investigated aerosol samples, which weretaken at the coastal research station in Mace Head,Ireland. These results are in good agreement with otherrecent studies, which demonstrated that the iodine chemistry in the marine atmosphere is only poorly understood.In addition to iodide and iodate, another iodine compoundcould be separated and detected in certain samples withhigh total iodine concentrations and was identified aselemental iodine, probably in form of triiodide, by peakmatching. However, it may arise from an artifact duringsample preparation.