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A new method to extract ²³²Th, ²³⁰Th and ²³¹Pa from seawater using a bulk-extraction technique with Nobias PA-1 chelating resin

Pinedo-González, Paulina and Anderson, Robert F. and Vivancos, Sebastián M. and Pavia, Frank J. and Fleisher, Martin Q. (2021) A new method to extract ²³²Th, ²³⁰Th and ²³¹Pa from seawater using a bulk-extraction technique with Nobias PA-1 chelating resin. Talanta, 223 (Pt 2). Art. No. 121734. ISSN 0039-9140. https://resolver.caltech.edu/CaltechAUTHORS:20201217-143607967

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Abstract

The long-lived radioisotopes of Th and Pa are unique tracers for quantifying rates of biogeochemical processes in the ocean. However, their generally low concentrations (sub-fg/kg for ²³²Th and ²³¹Pa and pg/kg for ²³⁰Th) in seawater make them difficult to measure. Here, we present a new approach to determine ²³²Th and ²³⁰Th using Nobias PA-1 chelating resin following a bulk-extraction technique, and report for the first time the use of this resin to measure ²³¹Pa concentrations. This method has high extraction efficiency (>80%) at pH of 4.4 ± 0.2 and the lowest procedural blanks reported in the literature: 1.0 ± 0.2 pg, 0.10 ± 0.03 fg, and 0.02 ± 0.01 fg for ²³²Th, ²³⁰Th, and ²³¹Pa, respectively, representing 3%, 0.02%, and 0.01% of the total dissolved ²³²Th, ²³⁰Th, and ²³¹Pa found in 5 L of a typical low-concentration surface seawater sample from the subtropical Pacific Ocean. The procedure yields data with high precision for all three isotopes (0.76% for ²³²Th, 0.89% for ²³⁰Th, and 0.96% for ²³¹Pa, 2σ), allowing us to reliably measure Th and Pa in the oceans even at concentrations as low as those found in surface waters of the South Pacific Ocean. The accuracy of this method was confirmed by the analysis of well-characterized standard solutions (SW STD 2010-1 and SW STD 2015-1) and seawater samples collected aboard the FS Sonne (cruise SO245) during the UltraPac cruise in the South Pacific Ocean. Simultaneous and rapid extraction of ²³²Th, ²³⁰Th and ²³¹Pa from seawater, as well as the high precision and accuracy of this method makes it ideal for both spatially and temporally high-resolution studies.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.talanta.2020.121734DOIArticle
ORCID:
AuthorORCID
Pinedo-González, Paulina0000-0003-4613-1113
Anderson, Robert F.0000-0002-8472-2494
Vivancos, Sebastián M.0000-0002-8057-5685
Pavia, Frank J.0000-0003-3627-0179
Fleisher, Martin Q.0000-0002-1141-8723
Alternate Title:A new method to extract 232Th, 230Th and 231Pa from seawater using a bulk-extraction technique with Nobias PA-1 chelating resin
Additional Information:© 2020 Elsevier. Received 8 June 2020, Revised 29 September 2020, Accepted 2 October 2020, Available online 11 October 2020. We are grateful for the valuable comments and suggestions provided by three anonymous reviewers. This work was supported by the U.S. National Science Foundation (OCE-1434479 to R.F.A. and OCE-1555726 to R.F.A.) and by the LDEO Climate Center Award to P.P.-G. CRediT authorship contribution statement. Paulina Pinedo-González: Conceptualization, Methodology, Investigation, Writing - original draft. Robert F. Anderson: Conceptualization, Funding acquisition. Sebastián M. Vivancos: Investigation, Writing - review & editing. Frank J. Pavia: Writing - review & editing. Martin Q. Fleisher: Resources. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funders:
Funding AgencyGrant Number
NSFOCE-1434479
NSFOCE-1555726
Lamont-Doherty Earth ObservatoryUNSPECIFIED
Subject Keywords:Nobias resin; Thorium; Protactinium; Seawater; Bulk extraction; GEOTRACES
Issue or Number:Pt 2
Record Number:CaltechAUTHORS:20201217-143607967
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201217-143607967
Official Citation:Paulina Pinedo-González, Robert F. Anderson, Sebastián M. Vivancos, Frank J. Pavia, Martin Q. Fleisher, A new method to extract 232Th, 230Th and 231Pa from seawater using a bulk-extraction technique with Nobias PA-1 chelating resin, Talanta, Volume 223, Part 2, 2021, 121734, ISSN 0039-9140, https://doi.org/10.1016/j.talanta.2020.121734.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107177
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:17 Dec 2020 23:01
Last Modified:17 Dec 2020 23:01

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