Application of Iolite in Data Reduction of Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry Line-scan Analysis
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摘要: LA-ICP-MS分析技术是获取矿物/岩石内部的元素和同位素成分变化的重要手段。在利用该技术对地质样品进行线/面扫描时，仪器输出的初始数据量远远大于点分析，数据的处理和计算是一个关键问题。本文以磷质结核样品为例，阐述了利用Iolite软件进行元素线扫描数据计算的主要过程，包括背景信号的扣除、标准物质信号的拟合、线分析数据的导出等。借助软件自带的分段导出功能，对不同时间和空间分辨率下采集数据得到的结果进行了比较。研究表明Iolite能有效处理线分析数据，分析结果与前人用传统化学全岩法测定得到的元素含量范围相当。对比不同空间分辨率下（10 μm、50 μm、100 μm）获取的数据发现：相对于选用的束斑直径（40 μm），在分辨率过小（10 μm）或过大（100 μm）的条件下获得的数据存在数据波动大以及细节不足等缺陷；而当分辨率（50 μm）与选用的束斑直径接近时，数据质量得到最大优化。本研究展示了Iolite软件在处理线扫描数据方面具有很好的应用前景，通过分辨率的选取可实现数据的优化。Abstract: Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) serves as an important tool for assessing variations in elemental/isotopic compositions of rocks and minerals. During LA-ICP-MS analysis, as spectrometric data acquired via mapping/line analysis are much more than those by single spot analysis, reduction and processing of the obtained data are critical. In this study, Iolite was used to handle LA-ICP-MS data acquired by line analysis on a phosphate nodule. The reduction processes include baseline subtraction, data correction using the interpolation method, and data output. The results obtained using different temporal (spatial) resolution were compared by the section output function of the software. Data reduction of line analysis using Iolite yields results similar to those obtained using wet-chemical analysis. Comparison of different temporal (spatial) resolution (10 μm, 50 μm, 100 μm) for data processing indicates that the results are best optimized when the chosen resolution (50 μm) approximates the spot size (40 μm) during analysis (in Fig.3 and Fig.4). By contrast, results obtained using lower (10 μm) or higher (100 μm) spatial resolution are either fluctuate more or lack detail. These observations indicate that Iolite is a promising tool for LA-ICP-MS data reduction. The results also emphasis the importance of using appropriate temporal (spatial) resolution for data reduction.
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Key words:
- LA-ICP-MS /
- Iolite software /
- line analysis /
- phosphate nodule /
- spatial resolution
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图 1 (a) 磷质结核剖面照片，红框处为线扫描区域；(b) 磷质结核线扫描区域显微照片，图中中间黑线为线扫描痕迹，绿色箭头指示扫描方向；(c) 为 (b) 中绿色框内区域放大
Figure 1.
表 1 仪器分析参数
Table 1. Working parameters of instrument measurement
电感耦合等离子体质谱 激光剥蚀系统 工作参数 设定值 工作参数 设定值 RF功率 1350 W 能量密度 22 J/cm2 冷却气流量 15.00 L/min 输出比例 90% 辅助气流量 1.00 L/min 束斑大小 40 μm 载气流量 1.02 L/min He气流量 0.85 L/min 数据模式 TRA 检测器模式 双重模式 测试元素 27Al, 29Si, 43Ca, 51V, 55Mn, 57Fe,
88Sr, 89Y, 95Mo, REEs (139La~175Lu),
208Pb, 238U积分时间 Al、Si、P、Fe、Mn、Sr均为1 ms；
其他元素为1.5 ms
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