摘要
Abstract
Due to the limits of the conventional solution nebulization SN-ICP-MS method for trace element measurement such as relatively long data-return time,potential risk of contamination,and the difficulty of digesting refractory,this study developed a new method for the trace element measurement of XRF glass bead using a 193 nm ArF laser ablation(LA)system coupled with Q-ICP-MS.Based on the sample matrix of LiBrO3 glass,we optimized the laser parameters and systematically evaluated the effects of different internal and external standards for data normalization.Our experimental results revealed that the use of Ca as the internal standard and NIST612 as the external standard yielded the best trace element data for eight reference materials of different lithologies including granite,andesite,and basalt(relative deviation<10％,RSD<10％).Compared with the results using femtosecond laser systems,our experiments show similar precision and accuracy for REE data,however,limitations persisted for transitional metals(e.g.,Sc).We also presented a case study of mafic rocks in the Muzidian area of the South China Block,our data showed a≤12％relative deviation between LA-ICP-MS and SN-ICP-MS REE data,which confirmed the utility of this method.In summary,our proposed highly efficient trace element analytical protocol based on the XRF glass bead requires a relatively small amount of sample(approximately 0.6 g,depending on the size of the glass bead).Also avoids the risk of inter-sample contamination during conventional chemical procedures,which yielded comparable quality of whole-rock REE data with the conventional solution-based methods.关键词
原位微区/硅酸盐玻璃/LA-ICP-MS/微量元素/REEKey words
in situ microanalysis/Silicate glass/LA-ICP-MS/trace elements/REE分类
化学化工
