Determination of iodine using a special sample introduction system coupled to a double-focusing sector field inductively coupled plasma mass spectrometer

• Published in: Journal of analytical atomic spectrometry 1996, Vol.11 (9), p.723-726
• Main Authors: KERL, W, BECKER, J. S, DIETZE, H.-J, DANNECKER, W
• Format: Article
• Language: English
• Subjects: Analytical chemistry; Chemistry; Exact sciences and technology; Spectrometric and optical methods
• ISSN: 0267-9477; 1364-5544
• DOI: 10.1039/JA9961100723

A procedure for the determination of iodine (especially super(129)I) in biological materials using double-focusing sector field mass spectrometry with an inductively coupled plasma ion source is described. To achieve a detection limit of less than 100 pg ml super(-1) for super(129)I by double-focusing sector field ICP-MS an apparatus for introducing elemental iodine via the gas phase into the argon plasma is tested. The influence of the concentration of various oxidation reagents for oxidizing iodide to iodine and matrix effects on the ion intensity of super(129)I super(+) and super(127)I super(+) are investigated. Quantitative determination of iodide is carried out by the standard additions procedure and isotope dilution analysis. The on-line addition of sample solution to an isotopic tracer solution according to the flow injection principle has proved to be efficient. The procedure is discussed by determining super(127)I as well as super(129)I in biological standard reference materials.