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Abstract
A revised chemical purification procedure for Cu–Zn isotopes is proposed in this study. The handing time and amounts of chemicals, such as H2O2 and HCl are largely saved with this modification. The ionization efficiencies of Cu and Zn are investigated in detail in wet and dry plasma with two kinds of skimmer cones. The ionization efficiency of Zn is depressed by HNO3 in the matrix, while HCl affects Cu and Zn ionization efficiency similarly. Potential polyatomic interferences with 68Zn+ and 70Zn+ are 40Ar14N2+ and 40Ar14N16O+ respectively, which are highly dependent on the amount of N2 in dry plasma and on the HNO3 concentration in wet plasma. Use of the DNS sample introduction device without N2 gas provides the best conditions for Cu–Zn isotope measurement. A Cu/Zn mass bias decoupling effect has been revealed in this study, and this effect appears to be dependent on the presence of HNO3 and N2 in ionizing plasma.
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