Measurements of natural uranium concentration and isotopic composition with permil-level precision by inductively coupled plasma-quadrupole mass spectrometry

Chuan Chou Shen, Huei Ting Lin, Mei Fei Chu, Ein-Fen Yu, Xianfeng Wang, Jeffrey A. Dorale

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A new analytical technique using inductively coupled plasma-quadrupole mass spectrometry (ICPQMS) has been developed that produces permil-level precision in the measurement of uranium concentration ([U]) and isotopic composition (δ234U) in natural materials. A 233U-236U double spike method was used to correct for mass fractionation during analysis. To correct for ratio drifting, samples were bracketed by uranium standard measurements. A sensitivity of 6-7 × 108 cps/ppm was generated with a sample solution uptake rate of 30 mL/min. With a measurement time of 15-20 min, standards of 30-ng uranium produced a within-run precision better than 3%(±2 R.S.D.) for δ234U and better than 2%for [U]. Replicate measurements made on standards show that a between-run reproducibility of 3.5%for δ234U and 2% for [U] can be achieved. ICP-QMS data of δ234U and [U] in seawater, coral, and speleothem materials are consistent with the data measured by other ICP-MS and TIMS techniques. Advantages of the ICP-QMS method include low cost, easy maintenance, simple instrumental operation, and few sample preparation steps. Sample size requirements are small, such as 10-14 mg of coral material. The results demonstrate that this technique can be applied to natural samples with various matrices.

Original languageEnglish
Article numberQ09005
JournalGeochemistry, Geophysics, Geosystems
Volume7
Issue number9
DOIs
Publication statusPublished - 2006 Sep 1

Fingerprint

Uranium
Inductively coupled plasma
uranium
Mass spectrometry
isotopic composition
mass spectroscopy
mass spectrometry
quadrupoles
plasma
coral
Chemical analysis
speleothem
sample preparation
Fractionation
Time measurement
Seawater
analytical method
fractionation
inductively coupled plasma mass spectrometry
seawater

Keywords

  • ICP-QMS
  • Natural uranium
  • Permil-level precision
  • δU

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Measurements of natural uranium concentration and isotopic composition with permil-level precision by inductively coupled plasma-quadrupole mass spectrometry. / Shen, Chuan Chou; Lin, Huei Ting; Chu, Mei Fei; Yu, Ein-Fen; Wang, Xianfeng; Dorale, Jeffrey A.

In: Geochemistry, Geophysics, Geosystems, Vol. 7, No. 9, Q09005, 01.09.2006.

Research output: Contribution to journalArticle

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