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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Perfit, Michael R. Mueller, Paul A. Kamenov, George D. |
| Copyright Year | 2004 |
| Abstract | Measurements of SRM 981 Pb isotope standard mixed with Tl for mass bias corrections were conducted with a MC-ICP-MS (Nu Plasma) using a Nu Instruments desolvating nebulizer. During the initial experiments, Pb and Tl from single-element, concentrated stock solutions were mixed in 2% HNO3 prior to isotope ratio measurements. The results revealed relatively poor precision and accuracy of the Pb isotope measurements, large variations in ε205Tl in the same standard (ranging from −3.9 to +30.1), and large variations in the observed Pb/Tl intensity ratios. When analyses were restricted to freshly mixed (<1 hour) Pb–Tl solutions, however, highly precise isotopic ratios were obtained for lead (206Pb/204Pb = 16.9373 (±0.0011, 2σ), 207Pb/204Pb = 15.4907 (±0.0012, 2σ), and 208Pb/204Pb = 36.6935 (±0.0039, 2σ)) and for thallium (ε205Tl = 1.5 (±0.8, 2σ)). In addition, Pb/Tl intensity ratios were constant and corresponded to the mixing ratios of the prepared solutions. A series of experiments revealed that the poor precision and accuracy observed for the initial set of isotope ratio measurements resulted from variable photoxidation of Tl+ to Tl3+, which occurs in the presence of Pb and solar UV radiation. This reversible reaction generates Tl3+, which behaves distinctly from Tl+ during desolvation and leads to consistently higher measured Pb/Tl and 205Tl/203Tl ratios. The extent of the interaction between Pb and Tl and the subsequent effect on isotope ratio measurements is sensitive to a combination of factors, including differences in the acid matrix and molarity, desolvation conditions, and UV light exposure. It appears that the observed ε205Tl variations in the Pb–Tl3+-bearing solutions dominantly result from mass-dependant differential diffusion of Tl during desolvation. These experiments suggest that great care must be exercised during isotopic analyses of systems utilizing one element for mass-bias correction on another, such as Pb–Tl, Cu–Zn and Mo–Zr, which readily undergo redox reactions under laboratory conditions. |
| Starting Page | 1262 |
| Ending Page | 1267 |
| Page Count | 6 |
| File Format | HTM / HTML PDF |
| ISSN | 02679477 |
| Volume Number | 19 |
| Issue Number | 9 |
| Journal | Journal of Analytical Atomic Spectrometry |
| DOI | 10.1039/b403222e |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | SRM Nu Plasma Cu Mo Lead Isotope Nebulizer Diversification (finance) Nitric acid Thallium Reversible reaction Acid Diffusion Redox |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Analytical Chemistry |
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