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- Title
Application of 10<sup>13</sup> ohm Faraday cup current amplifiers for boron isotopic analyses by solution mode and laser ablation multicollector inductively coupled plasma mass spectrometry.
- Authors
Lloyd, Nicholas S.; Sadekov, Aleksey Yu.; Misra, Sambuddha
- Abstract
Rationale: Boron isotope ratios (δ11B values) are used as a proxy for seawater paleo-pH, amongst several other applications. The analytical precision can be limited by the detection of low intensity ion beams from limited sample amounts. High-gain amplifiers offer improvements in signal/noise ratio and can be used to increase measurement precision and reduce sample amounts. Methods: 1013 ohm amplifier technology has previously been applied to several radiogenic systems, but has thus far not been applied to non-traditional stable isotopes. Here we apply 1013 ohm amplifier technology for the measurement of boron isotope ratios using solution mode MC-ICP-MS and laser ablation mode (LA-)MC-ICP-MS techniques. Precision is shown for reference materials as well as for low-volume foraminifera samples. Results: The baseline uncertainty for a 0.1 pA 10B+ ion beam is reduced to <0.1‰for a typical measurement period. The external precision is better than 0.2 ‰ (2SD) for δ11 B measurements for solution samples containing as little as 0.8 ng total boron. For in situ microanalyses with LA-MC-ICP-MS, the external precision of 11B/10B from an in-house calcite standard was 1 ‰ (2SD) for individual spot analyses, and 0.3‰for the mean of ≥10 replicate spot analyses. Conclusions: 1013 ohm amplifier technology is demonstrated to offer advantages for the determination of δ11B values by both MC-ICP-MS and LA-MC-ICP-MS for small samples of biogenic carbonates, such as foraminifera shells. 1013 ohm amplifier technology will also be of benefit to other non-traditional stable isotope measurements.
- Subjects
FARADAY cup; ELECTRONIC amplifiers; BORON isotopes; SOLUTION (Chemistry); LASER ablation; INDUCTIVELY coupled plasma mass spectrometry
- Publication
Rapid Communications in Mass Spectrometry: RCM, 2018, Vol 32, Issue 1, p9
- ISSN
0951-4198
- Publication type
Article
- DOI
10.1002/rcm.8009