Optimizing MC-ICP-MS with SEM protocols for determination of U and Th isotope ratios and 230 Th ages in carbonates
作者: Hong-Wei ChiangYanbin LuXianfeng WangKe LinXiaokang Liu
作者单位: 1Earth Observatory of Singapore, Nanyang Technological University, Singapore 639798, Singapore
2Asian School of the Environment, Nanyang Technological University, Singapore 639798, Singapore
3College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
刊名: Quaternary Geochronology, 2019, Vol.50 , pp.75-90
来源数据库: Elsevier Journal
DOI: 10.1016/j.quageo.2018.10.003
关键词: U–Th datingMC-ICP-MSSEM protocols236 U– 233 U double spikingCarbonates
英文摘要: Abstract(#br)We have optimized techniques to measure uranium and thorium isotopic compositions using secondary electron multiplier (SEM) and peak-jumping protocols on a multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS, Thermo Scientific Neptune Plus). This instrument is equipped with an advanced interface pump, X-skimmer cone, Jet sample cone, and desolvating nebulizer system (CETAC Aridus II) that enables overall ionization and transmission efficiency up to 3% for both U and Th. Approximately 50 fg 234 U or 230 Th can routinely yield a precision of 1–2‰ (2σ) for abundance and isotopic measurements. Non-linear behavior was not observed in the MasCom SEM with a retarding potential quadrupole in our MC-ICP-MS system when the beam intensity was limited to <∼1 × 10 6...
全文获取路径: Elsevier  (合作)
影响因子:4.015 (2012)

  • determination 测定
  • ratios 遗传比率
  • isotope 同位素
  • SEM Sample Evaluation Method