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用于在地质样本中测定Se和Te的感应合等离子体质谱法采样模式的比较

Yonghai Yuan^1,2, Feng Yang^1,2, Qiu Zhang¹

¹College of Earth Sciences, Guilin University of Technology, Guilin, China.

Analytical methods : advancing methods and applications

|June 6, 2025

概括

这项研究比较了使用ICP-MS在地质样本中分析 (Se) 和 (Te) 的气动雾化 (PN),化物生成 (HG) 和光化学蒸汽生成 (PVG).PVG提供了效率和可重复性的最佳平衡,而PN对于更高度更方便.

科学领域:

分析化学分析化学
地质化学地质化学
环境科学环境科学

背景情况:

在地质矩阵中精确确定 (Se) 和 (Te) 对于环境和地球化学研究至关重要.
感应合等离子体质谱法 (ICP-MS) 是一个强大的元素分析技术,但样品引入方法显著影响性能.
气动雾化 (PN),化物生成 (HG) 和光化学蒸汽生成 (PVG) 是不同的采样模式,具有不同的效率和可重复性.

研究的目的:

为了比较PN,HG和PVG采样模式的分析性能,加上ICP-MS用于在地质样本中测定Se和Te.
为每个采样模式优化ICP-MS操作参数,以获得最佳的分析结果.
根据分析剂度和所需的精度,为选择最合适的采样模式提供指导.

主要方法:

为PN,HG和PVG优化ICP-MS参数 (射频功率,碰撞气体流量,采样深度).
在每个采样模式中对Se和Te的引入效率和可重复性进行评估.
对14种地质认证参考材料 (CRM) 的分析,以验证不同度水平的方法性能.

主要成果:

PN模式显示出良好的可重现性,引入效率为Se的4.7%,Te的4.6%.
HG模式实现了最高的引入效率 (~57%的Se,~53%的Te),但表现出最差的可重现性.
PVG模式提供了平衡的性能,介绍效率为~45%的Se和~39%的Te,以及低的检测极限 (0.001μg L-1).

结论:

对于高Se (>0.1μg g−1) 和Te (>0.05 μg g−1) 的地质样本,PN和PVG都提供了令人满意的结果,PN更方便.
对于含有低Se (≤0.1 μg g-1) 和Te (≤0.05 μg g-1) 的样品,建议使用HG或PVG,特别是在缩预处理后.
这项比较研究为在不同度的地质样本中进行Se和Te分析选择最佳ICP-MS采样模式提供了可靠的基础.

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