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| Titel |
Alkali element background reduction in laser ICP-MS |
| VerfasserIn |
C. W. Jr. Magee, C. A. Norris |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 4, no. 1 ; Nr. 4, no. 1 (2015-03-17), S.75-80 |
| Datensatznummer |
250115235
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| Publikation (Nr.) |
 copernicus.org/gi-4-75-2015.pdf |
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| Zusammenfassung |
| Alkali backgrounds in laser ablation ICP-MS analyses can be enhanced by
electron-induced ionisation of alkali contamination on the skimmer cone,
reducing effective detection limits for these elements. Traditionally, this
problem is addressed by isolating analyses of high-alkali materials onto a designated cone set, or
by operating the ICP-MS in a "soft extraction" mode, which reduces the
energy of electrons repelled into the potentially contaminated sampling cone
by the extraction field. Here we present a novel approach, where we replace
the traditional alkali glass tuning standards with synthetic low-alkali glass
reference materials. Using this vitreous tuning solution, we find that this
approach reduces the amount of alkali contamination produced, halving
backgrounds for the heavy alkali elements without any change to analytical
procedures. Using segregated cones is still the most effective method for
reducing lithium backgrounds, but since the procedures are complimentary,
both can easily be applied to the routine operations of an analytical lab. |
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