Development of pressed sulfide powder tablets for in situ sulfur and lead isotope measurement using LA-MC-ICP-MS

被引:220
作者
Bao, Zhian [1 ]
Chen, Lu [1 ]
Zong, Chunlei [1 ]
Yuan, Honglin [1 ]
Chen, Kaiyun [1 ]
Dai, Mengning [1 ]
机构
[1] Northwest Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
LA-MC-ICP-MS; Lead isotope; Sulfur isotope; Homogeneity; Accuracy; PLASMA-MASS SPECTROMETRY; ABLATION MULTI-COLLECTOR; CONSTRAINTS; CALIBRATION; DELTA-S-34; MINERALS; SULFATE; GEOCHEMISTRY; STANDARDS; DEPOSIT;
D O I
10.1016/j.ijms.2017.07.015
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
Controlling the accuracy and precision of sulfur and lead isotopic compositions in natural sulfide minerals requires the use of well-characterized reference materials with matrices similar to those of the unknown samples being analyzed. However, it is often a challenge to prepare natural or synthetic reference materials with homogeneous isotope compositions on a micro-scale. Herein, we report a novel method to synthesize homogeneous sulfide reference materials in the form of nano-particulate pressed sulfide powder tablets (PSPTs). Non-matrix-matched external calibration was used to obtain accurate and precise lead isotopic ratios, while mass bias was corrected using a standard-sample bracketing method and a thallium standard solution doping process. In situ analysis of lead isotopic ratios of PSPTs using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) yielded good external precisions of <0.026% for Pb-207,Pb-208/Pb-206 and <0.057% for Pb-206,Pb-207,Pb-208/Pb-204 (2RSD). Meanwhile, the standard deviations of results afforded by LA-MC-ICP-MS were better than 0.41%. for S-34/S-32 (2SD). The in situ analytical results of PSPTs were consistent with the values obtained using solution nebulizer MC-ICP-MS, thus demonstrating the reliability and robustness of our analytical protocol. This method can also be used to synthesize different material matrices with homogeneous sulfur and lead isotopes to correct mass bias when using standard-sample bracketing for in situ analysis. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:255 / 262
页数:8
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