title: Improvements on high-precision measurement of bromine isotope ratios by multicollector inductively coupled plasma mass spectrometry.
abstract: A new, feasible procedure for high-precision bromine isotope analysis using multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) is described. With a combination of HR mass resolution mode and accurate optimization of the Zoom Optics parameters (Focus Quad: -1.30; Zoom Quad: 0.00), the challenging problem of the isobaric interferences ((40)Ar(38)ArH(+) and (40)Ar(40)ArH(+)) in the measurement of bromine isotopes ((79)Br(+), (81)Br(+)) has been effectively solved. The external reproducibility of the measured (81)Br/(79)Br ratios in the selected standard reference materials ranged from ±0.03‰ to ±0.14‰, which is superior to or equivalent to the best results from previous contributions. The effect of counter cations on the Br(+) signal intensity and the instrumental-induced mass bias was evaluated as the loss of HBr aerosol in nebulizer and potential diffusive isotope fractionations.
authors.affiliation: State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China. Electronic address: haizhenwei@nju.edu.cn.
authors.forename: Hai-Zhen
authors.initials: HZ
authors.lastname: Wei
authors.affiliation: State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China; State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, PR China. Electronic address: shyjiang@nju.edu.cn.
authors.forename: Shao-Yong
authors.initials: SY
authors.lastname: Jiang
authors.affiliation: State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China.
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Zhu
authors.affiliation: State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China.
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.affiliation: State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China.
authors.forename: Jing-Hong
authors.initials: JH
authors.lastname: Yang
authors.affiliation: State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China.
authors.forename: Xiong
authors.initials: X
authors.lastname: Yan
authors.affiliation: State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China.
authors.forename: He-Pin
authors.initials: HP
authors.lastname: Wu
authors.affiliation: State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China.
authors.forename: Tang-Li
authors.initials: TL
authors.lastname: Yang
keywords: Bromine isotope analysis; Counter ions effect; Instrument-induced mass bias; Isobaric interference; Multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS)