Synthesis of multi-element fluid inclusion standards suitable for the LA-ICP-MS analysis and establishment of the femtosecond laser analytical method
In-situ elemental analysis of individual fluid inclusions by using the laser ablation-inductively coupled plasma mass spectrometry(LA-ICP-MS)has unique advantages in tracing the sources of ore-forming materials and specifically characterizing mineralization processes.However,the lack of reliable fluid inclusion standards limits its development and application.In this study,by using the heating-quenching method,combined with the diamond grinding and HF etching methods,a large number of multi-elements-bearing(B,Na,K,Mn,Co,Rb,Sr,Mo,Cs and W)fluid inclusions with regular/elliptical shapes and relatively large sizes have been synthesized in quartz.They are suitable for the LA-ICP-MS analysis and can be used as its analytical standards.Microthermometric results show that freezing temperatures of the synthesized fluid inclusions are varied within a relative standard deviation(RSD)of less than 2%,indicating the excellent homogeneity of those synthesized fluid inclusions.Comparative analyses of those synthesized fluid inclusions have been conducted by using the 193 nm excimer laser ablation and femtosecond laser ablation methods.The results show that their elemental contents obtained by using the 193 nm laser ablation ICP-MS method have mostly relative analytical errors(>85%)within±20%,with RSD values varying from 5%to 17%.The analytical accuracy and precision of this method are comparable to those of the method undertaken in the international peer laboratories.Their elemental contents obtained by using the femtosecond laser ablation ICP-MS method have mostly(>80%)relative analytical errors within±30%,with RSD values varying from 11%to 25%.Although the accuracy and precision of analytical data obtained by using the femtosecond laser ablation ICP-MS method are slightly lower than those of data gained by using the 193 nm laser ablation ICP-MS method,they are comparable or even superior relative to those of the same method undertaken in the international laboratories,demonstrating the feasibility of this newly established femtosecond laser ablation ICP-MS analytical method in our lab.Because the success rate and efficiency for analyzing individual fluid inclusions can be significantly improved by using the femtosecond laser ablation ICP-MS method,this method has a wide application prospect and is worthy of further study.
NETL
NSTL
万方数据
