Determination of B/Ca of natural carbonates by HR-ICP-MS

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 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
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:	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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