PITTCON 08 Oral Session
Hyphenated techniques as modern detection systems in ion chromatography
Session Number 2670-4
Abstract
By coupling ion chromatography with mass spectrometry new fields of applications can be developed. In this work, IC/MS and IC-ICP/MS are used for the qualitative as well as quantitative analysis of environmentally and industrially relevant compounds. A big benefit of the hyphenated techniques is that they can reach the high sensitivities that are required for the analysis of widespread water contaminants. The United States Environmental Protection Agency and the European Union currently prescribe a maximum bromate concentration of 10 ppb in drinking water. For mineral waters, the pertinent regulations stipulate a limit of 3 ppb. For perchlorate a 6 ppb public health goal was established in the US. By means of IC/MS coupling, detection limits in the lower ng/L range are achieved. Additionally, the higher selectivity helps to avoid coelutions and suppress matrix interferences to the absolute minimum. IC/MS coupling allows reliable quantification of carboxylic acids in the presence of a high-salt matrix containing approximately 100 g/L chloride. The IC-ICP/MS technique is used for an improved speciation analysis of hazardous substances. The technique allows the determination of organic and inorganic compounds in a single run. Typical applications of IC-ICP/MS are the analysis of chromium(III) and (VI) as well as of organic and inorganic arsenic or selenium compounds. Another application of the hyphenated techniques is unambiguous peak identification. Using IC/MS, parent compounds and corresponding metabolites can be identified according to their mass/charge ratio. IC-ICP/MS is used for element specific analysis.
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