多种矿物流体包裹体中液相阴阳离子的同时测定

地质流体研究是地球科学领域的研究热点，矿物流体包裹体中成分是认识地质流体的关键。群体包裹体液相成分分析的传统方法大多采用单通道离子色谱分析阴离子，原子吸收光谱或电感耦合等离子体原子发射光谱分析阳离子，分析方法适用矿物种类少，单矿物需要量大（3g以上）。本文使用双通道离子色谱仪，经过大量条件实验，优化了样品爆裂、提取等前处理分析条件，确认了不同矿物可检测的离子，并采用富集方法将样品需要量由常规的3.00g减少到300mg，实现了石英、方解石、萤石、闪锌矿、石榴子石、磁铁矿和黄铁矿等多种矿物流体包裹体液相成分中Li⁺、Na⁺、K⁺、Mg²⁺、Ca²⁺、F^-、Cl^-、Br^-、NO₂^-、NO₃^-、SO₄^2-等阴阳离子的同时分析。所建立的离子色谱同时分析矿物流体包裹体液相微量成分分析方法简便、快速，成本低，用样量少，扩大了矿物种类的分析范围，为成矿流体研究提供了更加直接、有效的信息。

Ion chromatogram method for the determination of liquid composition of fluid inclusions in several common minerals by using a trace amount of sample

The study of geological fluids is a focus of earth science. The compositions of fluid inclusions are the key to understanding the geological fluids. In traditional methods, the anions of liquid ingredients are detected by single-channel ion chromatography, and the cations of liquid ingredients are detected by AAS or ICP-AES. The traditional methods can only analyze a few mineral species and requires a larger amount of mineral (over 3 g). The dual-channel ion chromatography was used in this study. After a number of condition experiments, the authors optimized the pre-treatment analysis method (such as burst and extraction), and identified the detectable ions in different minerals. The weight of the sample was reduced from 3 g to 300 mg by using the concentration method. Quartz, calcite, fluorite, sphalerite, garnet, magnetite and pyrite were analyzed for their liquid phase compositions (Li⁺, Na⁺, K⁺, Mg²⁺, Ca²⁺, F^-, Cl^-, Br^-, NO₂^-, NO₃^- and SO₄^2-). The new ion chromatographic analysis method established by the authors is characterized by such advantages as simple operation, rapidness, low cost, and requirement of only a small weight of sample, thus expanding the scope of analysis of mineral species. In addition, this method can provide more direct and effective information for the study of ore-forming fluids.