Sulfur determination by laser ablation high resolution magnetic sector ICP-MS applied to glasses, aphyric lavas,and micro-laminated sediments

作     者：Xu-Jie Shu Cin-Ty A.Lee 

作者机构：Department of Earth Science MS-126 Rice University State Key Laboratory for Mineral Deposits Research School of Earth Science and Engineering Nanjing University 

出 版 物：《Chinese Journal Of Geochemistry》 (中国地球化学学报)

年 卷 期：2015年第34卷第3期

页      面：273-288页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by NSF OCE1338842 

主　　题：激光烧蚀 质谱仪 沉积物 眼镜 高分辨率 磁场 扇形 熔岩 

摘      要：Sulfur(S) is an important element for understanding redox processes, ore formation, environmental chemistry, volcanism and climate. Here, we present a method for in situ S concentration measurement by LA-ICP-MS at the50–100 lm length scale using a 213 nm laser ablation set up coupled to a single-collector magnetic sector ICP-MS with high resolution capabilities. Analyses were performed in medium mass resolution(m/Dm = 3000) mode, which allows for the separation of32 S and34S from molecular interferences. S is simultaneously analyzed along with all major and minor elements so that a priori knowledge of an internal standard concentration is not necessary; this allows for in situ bulk analysis of aphyric groundmass in volcanic rocks or other fine-grained samples. The primary limitation in analyzing S by laser ablation was found to be long-term instrumental drift in fractionation of elemental S relative to other elements,presumably due to drift in laser dynamics. A method for correcting for such fractionation over time was *** correcting for such drift, measurements of homogeneous basaltic glasses are reproducible to within 10 % for high concentration samples([500 ppm) and to within 20 % for low concentration samples(\200 ppm). The applicability of the method was demonstrated using natural and synthetic glasses, aphyric lavas, and micro-laminated sediments.