High-precision determination of 234U/238U activity ratios in natural waters and carbonates by ICPMS

Michael E Ketterer, Christopher J. Khourey

Research output: Chapter in Book/Report/Conference proceedingChapter

7 Citations (Scopus)

Abstract

A method has been developed for precise measurement of 234U/238U activity ratios in natural waters and carbonates using quadrupole inductively coupled plasma mass spectrometry. A recovery of 80-85% of seawater U is achieved by Fe(III) coprecipitation followed by extraction chromatography with a supported dipentyl pentane phosphonate material; 90-95% of U is recovered from carbonates, which are are dissolved in HNO3 and subjected to the same extraction chromatographic preparation Isotopic measurements are made via recirculating pneumatic nebulization of small volumes of solutions containing 0.5-5 mg/L U. 234U/235U is measured as a proxy for determination of 234U/238U; iridium is added to sample solutions and the ion ratio 191Ir40Ar+Y193Ir40Ar + is measured for internal mass discrimination correction. 234U/238U activity ratios in the range 1.143-1.154 are observed for 13 seawater and contemporary corals, in agreement with the established marine 234U/238U activity ratio. For sample sizes of 5-25 μg U, ICPMS uncertainties of+/- 0.2-0.5 % relative, 2σ standard error, approach those obtained for < 0.1 μg U by thermal ionization mass spectrometry. Measurements of 234U/238U activity ratios in bottled waters, Lake Erie surface waters, mollusk fossils, and fertilizers are also demonstrated.

Original languageEnglish (US)
Title of host publicationASTM Special Technical Publication
PublisherAmerican Society for Testing and Materials
Pages120-136
Number of pages17
Volume1344
StatePublished - 1998
Externally publishedYes

Fingerprint

Carbonates
Seawater
Water
Inductively coupled plasma mass spectrometry
Iridium
Fertilizers
Coprecipitation
Chromatography
Surface waters
Pneumatics
Ionization
Mass spectrometry
Lakes
Recovery
Ions
Uncertainty
Hot Temperature

Keywords

  • Carbonates
  • Environmental
  • Extraction chromatography
  • ICPMS
  • Isotope ratio MS
  • Uranium
  • Water

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Ketterer, M. E., & Khourey, C. J. (1998). High-precision determination of 234U/238U activity ratios in natural waters and carbonates by ICPMS. In ASTM Special Technical Publication (Vol. 1344, pp. 120-136). American Society for Testing and Materials.

High-precision determination of 234U/238U activity ratios in natural waters and carbonates by ICPMS. / Ketterer, Michael E; Khourey, Christopher J.

ASTM Special Technical Publication. Vol. 1344 American Society for Testing and Materials, 1998. p. 120-136.

Research output: Chapter in Book/Report/Conference proceedingChapter

Ketterer, ME & Khourey, CJ 1998, High-precision determination of 234U/238U activity ratios in natural waters and carbonates by ICPMS. in ASTM Special Technical Publication. vol. 1344, American Society for Testing and Materials, pp. 120-136.
Ketterer ME, Khourey CJ. High-precision determination of 234U/238U activity ratios in natural waters and carbonates by ICPMS. In ASTM Special Technical Publication. Vol. 1344. American Society for Testing and Materials. 1998. p. 120-136
Ketterer, Michael E ; Khourey, Christopher J. / High-precision determination of 234U/238U activity ratios in natural waters and carbonates by ICPMS. ASTM Special Technical Publication. Vol. 1344 American Society for Testing and Materials, 1998. pp. 120-136
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