scholarly journals Boron isotope dilution in cellular fractions of coffee leaves Evaluated by Inductively Coupled Plasma Mass Spectrometry with direct injection nebulization (DIN-ICP-MS)

2003 ◽  
Vol 14 (2) ◽  
pp. 269-273 ◽  
Author(s):  
Ana Cláudia S. Bellato ◽  
Amauri A. Menegário ◽  
Maria Fernanda Giné
Keyword(s):  
Mass Spectrometry ◽  
Isotope Dilution ◽  
Inductively Coupled Plasma ◽  
Direct Injection ◽  
Boron Isotope ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

scholarly journals A simplified isotope dilution approach for the U-Pb dating of speleogenic and other low-<sup>232</sup>Th carbonates by multi-collector ICP-MS

2021 ◽  
Author(s):  
Andrew J. Mason ◽  
Anton Vaks ◽  
Sebastian F. M. Breitenbach ◽  
John N. Hooker ◽  
Gideon M. Henderson
Keyword(s):  
Mass Spectrometry ◽  
Isotope Dilution ◽  
Inductively Coupled Plasma ◽  
New Method ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Abstract. We describe a new method for the measurement of U/Pb ratios by isotope dilution multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) for the dating of geologically young clean carbonates, particularly speleothems. The method is intended for materials containing little or no initial 232Th. We illustrate and validate the method with four examples ranging from 0.57 Ma to 20 Ma old. The new method is capable of applying the 235U-207 and 238U-234U-206Pb chronometers, common Pb and quantifiable residual 234U/238U disequilibrium permitting. These provide an alternative to the more widely used 238U-206Pb chronometer, which can be highly inaccurate for samples a few million years old, owing to uncertainties in the excess initial 234U (hence, excess radiogenic 206Pb) commonly observed in speleothems.

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