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THE MEASUREMENT OF THE ISOTOPE RATIOS AND CONCENTRATIOS OF ZINC BY THERMAL IONIZATION MASS SPECTROMETRY USING DUOBLE ISOTOPE DILUTION

Zhengbin Deng, Dan Guo

Abstract

The isotope ratios and concentrations of zinc are measured by silicagel-thermal ionizationmass spectrometry using the double isotope spikers. The double isotope spikers (￣(70)Zn and ￣(67)Zn-enriched isotopes) are used to correct the isotope mass fractionation for the zinc isotope ratios,andto certifv the zinc concentrations in the unknown samples. The zinc concentrations of these doubleisotope spikers are surveyed by a spiker made of pure(99. 99%)natural zinc metal powder. Thecorrecting factors (f_a、f_tandf_n)of the zinc isotope ratios in the spiked mixture,spike and un-spiked samples for the isotope mass fractionation,and the spike-to-unspiked ratios(X_r) of thezinc isotope r in the spiked mixture samples can be obtained to solve the matrix equations by nu-merical approximation.The natural zinc isotope ratios are:￣(64)Zn/￣(67)Zn=11. 8498,￣(66)Zn/￣(67)Zn=6.7977,￣(68)Zn/￣(67)Zn=4.5730 and￣(70)Zn/￣(67)Zn=0.1520. The uncertainies determined of the iso-tope ratios and concentrations of zinc are ±0. 16%and ±0.31%,respectivlely.

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Key concepts: Chemistry, Zinc, Isotope, Isotope dilution, Mass spectrometry, Isotopes of zinc, Thermal ionization mass spectrometry, Stable isotope ratio