Determination of 32 Trace Elements in Granite Pegmatite by Inductively Coupled Plasma-Optical Emission Spectrometry and Mass Spectrometry with Closed Acid Dissolution

Accurate determination of large ion lithophile elements, high field strength elements and rare earth elements in granite pegmatite can be used to judge the source of ore-forming fluid materials and the diagenetic tectonic environment. There are some problems in the sample determination process, such as incomplete decomposition of insoluble minerals and low recovery of elements like Zr, Hf, Th, U and rare earth elements. This article compared the decomposition effects of three methods. The results indicate that the two open digestion methods can lead to lower test results for elements such as Zr, Hf, and W, etc. In the closed digestion method, aqua regia was used instead of HNO₃ for residual redissolution, which promotes the redissolution of elements such as Nb, Ta, Zr, Hf, rare earth elements, etc. ICP-OES and ICP-MS can accurately determine 32 trace elements in granite pegmatite. The detection limit of the method was between 0.004μg/g and 2.50μg/g, with a precision of 1.0%−8.3% (RSD, n=12). The method was applied to the determination of 8 types of granite, pegmatite, rare metal ore reference materials and 3 types of actual samples. The measured values of the reference materials were consistent with the standard values. The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202307310105.