Misra, Sambuddha and Greaves, Mervyn and Owen, Robert and Kerr, Joanna and Elmore, Aurora C. and Elderfield, Henry (2014) Determination of B/Ca of natural carbonates by HR-ICP-MS. Geochemistry, Geophysics, Geosystems, 15 (4). pp. 1617-1628. ISSN 15252027 DOI https://doi.org/10.1002/2013GC005049
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Abstract
We report a new method for HR-ICP-MS based accurate and precise B/Ca determination from low mass natural carbonates (<=5 µg CaCO3), utilizing a mixed acid matrix (0.1 M HNO3 and 0.3 M HF) and accurate matrix matching technique. Our procedural B/Ca blank of 2.0 ± 1.0 µmol/mol, internal precision <=1.0%, average within run external precision <=4.0% (2σ), and rapid sample analysis (60 samples/day) make the method well suited for routine measurements. Established methods of B/Ca determination require >=65 µg CaCO3 to achieve a comparable external precision of 3.5% (2σ). We report a B/Ca detection limit of 2 µmol/mol compared to >=10 µmol/mol for previous methods, a fivefold improvement. The method presented here can determine a wide range of B/Ca (9.0–250 µmol/mol) in mass limited samples with considerable tolerance for matrix matching efficiency (<=±30%). The long-term reproducibility of B/Ca measured on Cambridge in-house consistency standards containing \textless20, \~85, and \~200 µmol/mol of B/Ca are ±3.7% (2σ, n = 100), ±3.9% (2σ, n = 150), and ±3.2% (2 s, n =180), respectively. A host of other trace element to Ca ratios can also be determined at comparable external precision from samples containing <=5 µg CaCO3. This method is suitable for trace element analysis of single foraminifera shell
Item Type: | Article |
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Additional Information: | © 2014. American Geophysical Union. All Rights Reserved. |
Uncontrolled Keywords: | 2014AREP; IA67; |
Subjects: | 01 - Climate Change and Earth-Ocean Atmosphere Systems |
Divisions: | 01 - Climate Change and Earth-Ocean Atmosphere Systems 06 - Part-III Projects 08 - Green Open Access |
Journal or Publication Title: | Geochemistry, Geophysics, Geosystems |
Volume: | 15 |
Page Range: | pp. 1617-1628 |
Identification Number: | https://doi.org/10.1002/2013GC005049 |
Depositing User: | Sarah Humbert |
Date Deposited: | 27 Jun 2014 16:56 |
Last Modified: | 18 Dec 2014 18:31 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/3071 |
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