Time-resolved measurements of individual ion cloud signals to investigate space-charge effects in plasma mass spectrometry
✍ Scribed by John W. Olesik; Michael P. Dziewatkoski
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 600 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1044-0305
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✦ Synopsis
A new approach to directly monitor space charge induced effects due to high concentrations of efficiently ionized elements in inductively coupled plasma mass spectrometry (ICI'-MS) is described. The broadening of ion clouds produced from individual, monodisperse drops of sample is measured by using time-resolved ICP-MS. The extent of broadening due to high concentrations of Pb in the sample is related inversely to the analyte mass. For the lightest analyte investigated, Li+, the relative width of the time-resolved analyte peak increases and then shows a dip in the center as the Pb concentration is increased to 500 and then 1500 ,ug/mL. The initial results of experiments that investigated chemical matrix effects as a function of concomitant species concentration, analyte mass, and sampling location in ICP-MS are consistent with space-charge effects.