Testing a new small-volume technique for determining 234Th in seawater

C. R. Benitez-Nelson; K. O. Buesseler; M. Rutgers Van Der Loeff; J. Andrews; L. Ball; G. Crossin; M. A. Charette

doi:10.1023/A:1010621618652

Testing a new small-volume technique for determining ²³⁴Th in seawater

C. R. Benitez-Nelson, K. O. Buesseler, M. Rutgers Van Der Loeff, J. Andrews, L. Ball, G. Crossin, M. A. Charette

Research output: Contribution to journal › Article › peer-review

101 Citations (Scopus)

Abstract

Thorium-234 is a naturally occurring radionuclide that has been widely studied in ocean sciences. These studies use the disequilibrium between the soluble parent uranium-238 (T_1/2 = 4.5·10⁹ y), and its particle reactive daughter, ²³⁴Th (T_1/2 = 24.1 d), to quantify the in-situ removal rates of ²³⁴Th on sinking particles. Here, we present additional experiments that test a new 2-1 procedure in which ²³⁴Th is co-scavenged with a MnO₂ precipitate. Unlike other techniques, this method can be easily applied at-sea with an overall precision and accuracy of ≤5%. Our experiments have sought to elucidate the effects of delaying reagent addition and precipitate filtration, differences in sample bottle types, and issues related to sample backgrounds and ²³⁴Th particulate sampling. Most of these experiments were conducted using water collected on repeated occupations of station ALOHA (22°45.0'N, 158°00.0'W), 100 km North of Oahu, Hawaii.

Original language	English
Pages (from-to)	795-799
Number of pages	5
Journal	Journal of Radioanalytical and Nuclear Chemistry
Volume	248
Issue number	3
DOIs	https://doi.org/10.1023/A:1010621618652
Publication status	Published - 2001
Externally published	Yes

Bibliographical note

Funding Information:
We would like to thank Dr. DANIELS at NELHA and Dr. KARL at the University of Hawaii for allowing us to participate in the HOT program. Support for this research was from the National Science Foundation Division of Ocean Sciences and Office of Polar Programs. Additional funds were provided to MAC as part of the WHOI Postdoctoral Fellowship Program and to CRB-N, as part of the University of Hawaii SOEST Young Investigator Program and NOAA/UCAR Postdoctoral Fellowship in Global Change. This is SOEST Contribution Number 5277 and WHOI Contribution Number 10333.

ASJC Scopus Subject Areas

Analytical Chemistry
Nuclear Energy and Engineering
Radiology Nuclear Medicine and imaging
Pollution
Spectroscopy
Public Health, Environmental and Occupational Health
Health, Toxicology and Mutagenesis

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1023/A:1010621618652

Cite this

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abstract = "Thorium-234 is a naturally occurring radionuclide that has been widely studied in ocean sciences. These studies use the disequilibrium between the soluble parent uranium-238 (T1/2 = 4.5·109 y), and its particle reactive daughter, 234Th (T1/2 = 24.1 d), to quantify the in-situ removal rates of 234Th on sinking particles. Here, we present additional experiments that test a new 2-1 procedure in which 234Th is co-scavenged with a MnO2 precipitate. Unlike other techniques, this method can be easily applied at-sea with an overall precision and accuracy of ≤5%. Our experiments have sought to elucidate the effects of delaying reagent addition and precipitate filtration, differences in sample bottle types, and issues related to sample backgrounds and 234Th particulate sampling. Most of these experiments were conducted using water collected on repeated occupations of station ALOHA (22°45.0'N, 158°00.0'W), 100 km North of Oahu, Hawaii.",

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note = "Funding Information: We would like to thank Dr. DANIELS at NELHA and Dr. KARL at the University of Hawaii for allowing us to participate in the HOT program. Support for this research was from the National Science Foundation Division of Ocean Sciences and Office of Polar Programs. Additional funds were provided to MAC as part of the WHOI Postdoctoral Fellowship Program and to CRB-N, as part of the University of Hawaii SOEST Young Investigator Program and NOAA/UCAR Postdoctoral Fellowship in Global Change. This is SOEST Contribution Number 5277 and WHOI Contribution Number 10333.",

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AU - Benitez-Nelson, C. R.

AU - Buesseler, K. O.

AU - Van Der Loeff, M. Rutgers

AU - Andrews, J.

AU - Ball, L.

AU - Crossin, G.

AU - Charette, M. A.

N1 - Funding Information: We would like to thank Dr. DANIELS at NELHA and Dr. KARL at the University of Hawaii for allowing us to participate in the HOT program. Support for this research was from the National Science Foundation Division of Ocean Sciences and Office of Polar Programs. Additional funds were provided to MAC as part of the WHOI Postdoctoral Fellowship Program and to CRB-N, as part of the University of Hawaii SOEST Young Investigator Program and NOAA/UCAR Postdoctoral Fellowship in Global Change. This is SOEST Contribution Number 5277 and WHOI Contribution Number 10333.

PY - 2001

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N2 - Thorium-234 is a naturally occurring radionuclide that has been widely studied in ocean sciences. These studies use the disequilibrium between the soluble parent uranium-238 (T1/2 = 4.5·109 y), and its particle reactive daughter, 234Th (T1/2 = 24.1 d), to quantify the in-situ removal rates of 234Th on sinking particles. Here, we present additional experiments that test a new 2-1 procedure in which 234Th is co-scavenged with a MnO2 precipitate. Unlike other techniques, this method can be easily applied at-sea with an overall precision and accuracy of ≤5%. Our experiments have sought to elucidate the effects of delaying reagent addition and precipitate filtration, differences in sample bottle types, and issues related to sample backgrounds and 234Th particulate sampling. Most of these experiments were conducted using water collected on repeated occupations of station ALOHA (22°45.0'N, 158°00.0'W), 100 km North of Oahu, Hawaii.

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