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Calibration-free analysis of immersed brass alloys using long-ns-duration pulse laser-induced breakdown spectroscopy with and without correction for nonstoichiometric ablation

Calibration-free analysis of immersed brass alloys using long-ns-duration pulse laser-induced breakdown spectroscopy with and without correction for nonstoichiometric ablation
Calibration-free analysis of immersed brass alloys using long-ns-duration pulse laser-induced breakdown spectroscopy with and without correction for nonstoichiometric ablation
Long-ns-duration, single pulse laser-induced breakdown spectroscopy (LIBS) is known to be an effective method to observe well resolved spectra from samples immersed in water at high hydrostatic pressures. The aim of this study is to investigate whether the signals obtained using this method are suitable for quantitative analysis of chemical composition. Six certified brass alloys consisting of copper (Cu), zinc (Zn) and lead (Pb) were measured underwater using a laser pulse of duration 250 ns, and their compositions were determined using calibration-free LIBS (CF-LIBS) and corrected CF-LIBS (CCF-LIBS) methods. The mass fractions of Cu and Zn calculated using CF-LIBS showed better agreement with the certified values than those determined using CCF-LIBS, with relative errors of Cu 4.2 ± 3.3 % and Zn 7.2 ± 6.4 %. From the results, it can be said that the difference of preferential evaporation and ablation among elements does not need to be considered for underwater measurements with the long-pulse LIBS setup used in this work. While the results indicate that the CF-LIBS method can be applied for in situ quantitative analysis of major elements with concentrations > ~ 10 %, the mass fractions determined for Pb, with concentrations < 5 % had large relative errors, suggesting that an alternative method is required to quantify minor elements.
0584-8547
8-14
Takahashi, Tomoko
3f3f98c5-993c-4e11-b5ec-0fa4dbdbced9
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Ohki, Koichi
0591f5f7-dcf3-45b0-a6ee-9b026b7b82a6
Sakka, Tetsuo
fd41ffee-1abd-46cb-99dc-94bb96aecc38
Takahashi, Tomoko
3f3f98c5-993c-4e11-b5ec-0fa4dbdbced9
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Ohki, Koichi
0591f5f7-dcf3-45b0-a6ee-9b026b7b82a6
Sakka, Tetsuo
fd41ffee-1abd-46cb-99dc-94bb96aecc38

Takahashi, Tomoko, Thornton, Blair, Ohki, Koichi and Sakka, Tetsuo (2015) Calibration-free analysis of immersed brass alloys using long-ns-duration pulse laser-induced breakdown spectroscopy with and without correction for nonstoichiometric ablation. Spectrochimica Acta Part B Atomic Spectroscopy, 111, 8-14. (doi:10.1016/j.sab.2015.06.009).

Record type: Article

Abstract

Long-ns-duration, single pulse laser-induced breakdown spectroscopy (LIBS) is known to be an effective method to observe well resolved spectra from samples immersed in water at high hydrostatic pressures. The aim of this study is to investigate whether the signals obtained using this method are suitable for quantitative analysis of chemical composition. Six certified brass alloys consisting of copper (Cu), zinc (Zn) and lead (Pb) were measured underwater using a laser pulse of duration 250 ns, and their compositions were determined using calibration-free LIBS (CF-LIBS) and corrected CF-LIBS (CCF-LIBS) methods. The mass fractions of Cu and Zn calculated using CF-LIBS showed better agreement with the certified values than those determined using CCF-LIBS, with relative errors of Cu 4.2 ± 3.3 % and Zn 7.2 ± 6.4 %. From the results, it can be said that the difference of preferential evaporation and ablation among elements does not need to be considered for underwater measurements with the long-pulse LIBS setup used in this work. While the results indicate that the CF-LIBS method can be applied for in situ quantitative analysis of major elements with concentrations > ~ 10 %, the mass fractions determined for Pb, with concentrations < 5 % had large relative errors, suggesting that an alternative method is required to quantify minor elements.

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Accepted/In Press date: 13 June 2015
e-pub ahead of print date: 20 June 2015
Published date: 1 September 2015
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 400008
URI: http://eprints.soton.ac.uk/id/eprint/400008
ISSN: 0584-8547
PURE UUID: c01b7f5a-3f21-4b8b-8499-8c9bcd616e24

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Date deposited: 06 Sep 2016 15:46
Last modified: 26 Apr 2022 19:24

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Contributors

Author: Tomoko Takahashi
Author: Blair Thornton
Author: Koichi Ohki
Author: Tetsuo Sakka

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