Zinc isotope tracing technology plays a significant role in the inversion of ore-forming processes,tracing of pollution sources and deep carbon cycles.However,the complex matrix composition and the varying levels of zinc content constrain the accurate determination of zinc isotopic compositions in rock samples.This study explored an analytical method for zinc isotope in rock samples of different matrix types based on the testing method of MC-ICP-MS,which mainly included the dissolution method of samples,the separation and purification of zinc,and the impact of interfering ions.The experiment used AGMP-1(38-75 μm)resin for separation and purification,and the analysis process employed the standard-sample bracketing method(SSB)to correct for mass bias produced by the instrument.The long-term stability of the instrument was monitored using the CAGS-Zn isotope standard solution.The zinc isotopic compositions of the GBW07105,BCR-2,and BIR-1a geological standard samples were measured to be:δ66ZnGBW07105-IRMM-3702=0.25 ‰±0.06 ‰,δ66ZnBCR-2-IRMM-3702=-0.07 ‰±0.06 ‰,δ66ZnBIR-1A-IRMM-3702=-0.09 ‰±0.01 ‰,respectively.The test results are consistent with the internationally reported values within the error range,verifying the accuracy and feasibility of this method.This study has developed an analytical method for zinc isotope analysis in rock samples,which is characterized by a low procedural blank,high interference removal efficiency,and strong applicability of the separation procedure.Using this method,we effectively analyzed the zinc isotope compositions of seven rock samples with different lithologies,and provided robust methodological support for accurately measuring zinc isotope compositions in complex matrix samples.
rock sampleszinc isotopic compositionsMC-ICP-MScomplex matrix
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