An improved protocol for 87Sr/86Sr by laser ablation multi-collector inductively coupled plasma mass spectrometry using oxide reduction and a customised plasma interface
An improved protocol for 87Sr/86Sr by laser ablation multi-collector inductively coupled plasma mass spectrometry using oxide reduction and a customised plasma interface
Strontium isotope analysis has become one of the most effective means to characterise mobility and migration of humans and animals in the past. Analysis of strontium isotopes in bulk dental enamel by dissolution and chemical separation is precise, reliable and accurate. Laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) offer high spatial, and therefore temporal, resolution sampling. However, the application of LA-MC-ICP-MS to strontium isotopes in bioapatites has been limited due to the presence of isobaric interferences. In particular, 40Ca31P16O+ (CaPO+) on 87Sr+ has been identified as causing a consistent positive offset in 87Sr/86Sr by LA-MC-ICP-MS, relative to dissolution methods, of approximately 500 to 1500 ppm.
It has been demonstrated that tuning the mass spectrometer for reduced oxide production can reduce the size of this effect but not eliminate it completely. Here we present a revised protocol using a customised plasma interface through which helium gas is introduced. We find that using the oxide reduction and the customised plasma interface protocols can further reduce the offset such that we can achieve accuracy to within typical analytical precisions (± 50 ppm, 2?) without any need for further mathematical corrections. We test the methodology by ‘blind’ comparisons between LA-MC-ICP-MS and micro-drill/dissolution thermal ionisation mass spectrometry on two archaeological teeth. Both techniques are in excellent agreement
173-181
Lewis, J.
b044562a-3f09-4fcf-8730-9bd21f63d1ad
Coath, C.D.
2d172e1a-6db3-438f-b294-00a722e1e1dc
Pike, A.W.G.
e8603e20-0a89-4d57-a294-247b983fc857
18 December 2014
Lewis, J.
b044562a-3f09-4fcf-8730-9bd21f63d1ad
Coath, C.D.
2d172e1a-6db3-438f-b294-00a722e1e1dc
Pike, A.W.G.
e8603e20-0a89-4d57-a294-247b983fc857
Lewis, J., Coath, C.D. and Pike, A.W.G.
(2014)
An improved protocol for 87Sr/86Sr by laser ablation multi-collector inductively coupled plasma mass spectrometry using oxide reduction and a customised plasma interface.
Chemical Geology, 390, .
(doi:10.1016/j.chemgeo.2014.10.021).
Abstract
Strontium isotope analysis has become one of the most effective means to characterise mobility and migration of humans and animals in the past. Analysis of strontium isotopes in bulk dental enamel by dissolution and chemical separation is precise, reliable and accurate. Laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) offer high spatial, and therefore temporal, resolution sampling. However, the application of LA-MC-ICP-MS to strontium isotopes in bioapatites has been limited due to the presence of isobaric interferences. In particular, 40Ca31P16O+ (CaPO+) on 87Sr+ has been identified as causing a consistent positive offset in 87Sr/86Sr by LA-MC-ICP-MS, relative to dissolution methods, of approximately 500 to 1500 ppm.
It has been demonstrated that tuning the mass spectrometer for reduced oxide production can reduce the size of this effect but not eliminate it completely. Here we present a revised protocol using a customised plasma interface through which helium gas is introduced. We find that using the oxide reduction and the customised plasma interface protocols can further reduce the offset such that we can achieve accuracy to within typical analytical precisions (± 50 ppm, 2?) without any need for further mathematical corrections. We test the methodology by ‘blind’ comparisons between LA-MC-ICP-MS and micro-drill/dissolution thermal ionisation mass spectrometry on two archaeological teeth. Both techniques are in excellent agreement
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More information
Accepted/In Press date: 21 October 2014
e-pub ahead of print date: 29 October 2014
Published date: 18 December 2014
Additional Information:
laser ablation, strontium isotopes, methods
Organisations:
Archaeology
Identifiers
Local EPrints ID: 372374
URI: http://eprints.soton.ac.uk/id/eprint/372374
ISSN: 0009-2541
PURE UUID: 41691a45-031a-48ab-a392-abd600c45cda
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Date deposited: 05 Dec 2014 10:25
Last modified: 15 Mar 2024 03:44
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Author:
J. Lewis
Author:
C.D. Coath
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