Coral Ba/Ca Analysis Using ICP-OES With an Ultrasonic Nebulizer

Takaaki K. Watanabe, Tsuyoshi Watanabe, Kazuto Ohmori, Atsuko Yamazaki

Research output: Contribution to journalArticlepeer-review


The barium/calcium ratio (Ba/Ca) in coral skeletons has been used as a proxy to understand river floods and oceanic upwelling in the tropics and subtropics for the past centuries. Here, we establish a new method for Ba/Ca analysis using inductively coupled plasma optical emission spectrometry (ICP-OES), which has been widely used for coral proxy analyses and can save analysis time compared to other methods. We analyze Ba/Ca by combining an ultrasonic nebulizer with the intensity ratio calibration method to improve the signal intensity of Ba. Our method can determine Ba/Ca in samples with a Ca concentration of 9 mg/L with excellent analytical precision (<0.17 μmol/mol) using ICP-OES.

Original languageEnglish
Article numbere2021GC009646
JournalGeochemistry, Geophysics, Geosystems
Issue number8
Publication statusPublished - Aug 2021

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology


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