Due to the advantages of multi-collector inductively coupled plasma mass spectrometry(MC-ICP-MS)such as strong matrix tolerance,high precision,and rapid instrumental measurement,the application of MC-ICP-MS for analyzing uranium isotope abundance has become increasingly widespread.However,in the analysis of uranium isotope abundance using MC-ICP-MS,aqueous solution samples injection can lead to the generation of hydride interference(UH/U).The extremely small amount of 235 UH+produced alongside 235 U+results in a molecular interference at m/Z 236 with 236 U+,which interferes with accurate measurements of low-abundance 236 U and impacts the accuracy of its abundance determination.In this study,a UH correction method was developed specifically for accurately determining low-abundance 236 U.The estimated methodological detection limit of n(236U)/n(235 U)abundance ratio was estimated to be 4×10－6.When measuring a sample with an n(236U)/n(235 U)abundance ratio of 2.20×10－5,the relative error compared to traditional thermal ionization mass spectrometry(TIMS)was less than 3×10－6,and the relative standard deviation was less than 4%.
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