Abstract
This paper presents an improved technique for the precise and accurate determination of Ag isotopic composition in geologic samples. Following the separation of Ag from the rock matrix with a three-stage ion exchange procedure, the isotopic composition is measured by MC-ICPMS. Instrumental mass bias is corrected externally using a Pd standard, which was added to each sample, and sample-standard bracketing. The use of wet plasma significantly improves the analytical precision by eliminating variations in fractionation between Pd and Ag. A virtually identical behavior of the mass bias for Pd and Ag during the analyses is a prerequisite for the external correction method. Replicate dissolutions of the carbonaceous chondrite Allende with
Original language | English |
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Pages (from-to) | 183-191 |
Number of pages | 8 |
Journal | International Journal of Mass Spectrometry |
Volume | 261 |
Issue number | 2-3 |
DOIs | |
Publication status | Published - 15 Mar 2007 |
Keywords
- Extinct radionuclide
- MC-ICPMS
- Meteorite
- Silver isotopes
- Stable isotope fractionation