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分析化学  2011 

激光剥蚀电感耦合等离子体质谱分析硅酸盐矿物基体效应的研究

, PP. 1582-1588

Keywords: 激光剥蚀-电感耦合等离子体质谱,硅酸盐矿物,玻璃标样,基体效应,相对灵敏度因子,元素分馏效应

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Abstract:

标样与样品之间基体效应的差异是影响LA-ICP-MS分析结果准确度的重要因素,而元素的相对灵敏度因子(RSF)是基体效应的重要表征。本研究考察了17个玻璃标样中49种常见元素及10个电子探针天然硅酸盐矿物标样中10种主、微量元素RSF的差异,比较了以Ca,Al,Si为内标对基体效应的补偿作用及元素分馏效应的影响。结果表明,各玻璃标样及各硅酸盐矿物标样之间基体效应差异都较小,由所有玻璃标样和矿物标样得到的各元素RSF的RSD都小于8%,具有天然地质基体及玄武岩基体的玻璃标样与矿物之间基体效应差异更小。Ca是定量分析硅酸盐矿物最合适的内标元素,Si因有轻微分馏效应,以Ca和Al为内标元素是更理想的选择。玻璃标样与矿物标样中相同元素具有相似且不严重的分馏行为。外标结合内标法分析了镁橄榄石中27种元素,主量元素与给定值的相对误差几乎都优于4%,微量及痕量元素分析结果令人满意。

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