2024-03-29T11:25:12Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/839682022-11-17T02:08:08Zhdl_2115_20039hdl_2115_116Coral Ba/Ca Analysis Using ICP-OES With an Ultrasonic NebulizerWatanabe, Takaaki K.Watanabe, TsuyoshiOhmori, KazutoYamazaki, AtsukoBaCacoralICP-OESlimnologyoceanographyultrasonic nebulizer450The 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 mu mol/mol) using ICP-OES.American Geophysical UnionJournal Articleapplication/pdfhttp://hdl.handle.net/2115/83968https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/83968/1/Geochem.%20Geophys.%20Geosyst.22-8_e2021GC009646.pdfGeochemistry geophysics geosystems228e20212021-08-01enginfo:doi/10.1029/2021GC009646An edited version of this paper was published by AGU. Copyright 2021 American Geophysical Union.publisher