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Simultaneous lead isotope ratio and gold-lead-bismuth concentration analysis of silver by laser ablation MC-ICP-MS

Simultaneous lead isotope ratio and gold-lead-bismuth concentration analysis of silver by laser ablation MC-ICP-MS
Simultaneous lead isotope ratio and gold-lead-bismuth concentration analysis of silver by laser ablation MC-ICP-MS

A new approach is presented for the simultaneous analysis of lead isotope ratios and gold, lead, and bismuth concentrations in metallic silver using nanosecond laser ablation multi-collector inductively-coupled plasma mass spectrometry (LA-MC-ICP-MS). Corrections for both isotope and concentration analyses are performed using an in-house matrix matched silver reference material RM3834. Accuracy and external reproducibility are demonstrated by repeat analyses of a further seven silver reference materials all characterised by solution (MC)-ICP-MS approaches. Typical internal precisions, expressed as two relative standard errors (S.E.) of the mean of the cycles comprising one analysis, are <0.5% for 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb, and <0.03% for 207Pb/ 206Pb and 208Pb/ 206Pb. External reproducibilities, based on repeat analyses over a 10 month period and expressed as two relative standard deviations (S.D.) of the mean, are <0.4% for 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb and <0.2% for 207Pb/ 206Pb and 208Pb/ 206Pb. Internal precisions and external reproducibilities of gold, lead and bismuth concentration analyses are typically <25%. Data are consistent with solution-based approaches. Methods are further demonstrated through analyses of a set of Islamic silver dirhams from the mint of al-Muhammadiyya, highlighting their applicability to geochemical studies of archaeological artefacts.

Dirhams, Laser ablation, Lead isotopes, MC-ICP-MS, Silver
0305-4403
Standish, Christopher
0b996271-da5d-4c4f-9e05-a2ec90e8561d
Merkel, Stephen
9283f23c-de94-4c2e-8e80-748a0c0bc82b
Hsieh, Yu-Te
e0d5c707-4d2f-42b9-8e1b-7592856c8af6
Kershaw, Jane
a3e5043e-9236-45be-a23e-3d00eaa3a66e
Standish, Christopher
0b996271-da5d-4c4f-9e05-a2ec90e8561d
Merkel, Stephen
9283f23c-de94-4c2e-8e80-748a0c0bc82b
Hsieh, Yu-Te
e0d5c707-4d2f-42b9-8e1b-7592856c8af6
Kershaw, Jane
a3e5043e-9236-45be-a23e-3d00eaa3a66e

Standish, Christopher, Merkel, Stephen, Hsieh, Yu-Te and Kershaw, Jane (2021) Simultaneous lead isotope ratio and gold-lead-bismuth concentration analysis of silver by laser ablation MC-ICP-MS. Journal of Archaeological Science, 125, [105299]. (doi:10.1016/j.jas.2020.105299).

Record type: Article

Abstract

A new approach is presented for the simultaneous analysis of lead isotope ratios and gold, lead, and bismuth concentrations in metallic silver using nanosecond laser ablation multi-collector inductively-coupled plasma mass spectrometry (LA-MC-ICP-MS). Corrections for both isotope and concentration analyses are performed using an in-house matrix matched silver reference material RM3834. Accuracy and external reproducibility are demonstrated by repeat analyses of a further seven silver reference materials all characterised by solution (MC)-ICP-MS approaches. Typical internal precisions, expressed as two relative standard errors (S.E.) of the mean of the cycles comprising one analysis, are <0.5% for 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb, and <0.03% for 207Pb/ 206Pb and 208Pb/ 206Pb. External reproducibilities, based on repeat analyses over a 10 month period and expressed as two relative standard deviations (S.D.) of the mean, are <0.4% for 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb and <0.2% for 207Pb/ 206Pb and 208Pb/ 206Pb. Internal precisions and external reproducibilities of gold, lead and bismuth concentration analyses are typically <25%. Data are consistent with solution-based approaches. Methods are further demonstrated through analyses of a set of Islamic silver dirhams from the mint of al-Muhammadiyya, highlighting their applicability to geochemical studies of archaeological artefacts.

Text
Standish et al 2021 Silver LA-MC-ICP-MS - Version of Record
Available under License Creative Commons Attribution.
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More information

Accepted/In Press date: 19 November 2020
e-pub ahead of print date: 3 December 2020
Published date: January 2021
Keywords: Dirhams, Laser ablation, Lead isotopes, MC-ICP-MS, Silver

Identifiers

Local EPrints ID: 445637
URI: http://eprints.soton.ac.uk/id/eprint/445637
ISSN: 0305-4403
PURE UUID: aaec4804-f469-4f82-ab98-1a434f8c0959
ORCID for Christopher Standish: ORCID iD orcid.org/0000-0002-9726-295X

Catalogue record

Date deposited: 05 Jan 2021 17:30
Last modified: 28 Apr 2022 02:11

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Contributors

Author: Stephen Merkel
Author: Yu-Te Hsieh
Author: Jane Kershaw

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