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Effects of cone combinations on the signal enhancement by nitrogen in LA-ICP-MS†
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-04-20 00:00:00 , DOI: 10.1039/c7ja00376e Tao He 1, 2, 3, 4 , Qian Ni 1, 2, 3, 4, 5 , Qi Miao 1, 2, 3, 4 , Ming Li 1, 2, 3, 4
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-04-20 00:00:00 , DOI: 10.1039/c7ja00376e Tao He 1, 2, 3, 4 , Qian Ni 1, 2, 3, 4, 5 , Qi Miao 1, 2, 3, 4 , Ming Li 1, 2, 3, 4
Affiliation
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The effects of assorted cone combinations on the signal enhancement of nitrogen in LA-ICP-MS are presented. In Ar plasma, the standard sample cone + X skimmer cone (S + X cone) increases the sensitivity for most of the investigated elements by a factor of 1.5–9.7 compared to the standard sample cone + H skimmer cone (S + H cone). The effect of the addition of nitrogen on the sensitivities of elements obtained by LA-ICP-MS was minimal for the S + H cone but significant for the S + X cone. The degree of the signal enhancement by the addition of nitrogen is positively correlated with the oxide bond dissociation energy of the element. Compared to Ar plasma, the oxide ratio in Ar–N2 mixed plasma (N2 = 4 ml min−1) is reduced from 31.5% to 1.8% in the S + H cone and from 88.7% to 12.6% in the S + X cone. The hydride yield is also reduced by a factor of 10 and 46 in the S + H cone and S + X cone by the addition of nitrogen (4 ml min−1), respectively. Our results indicate that the geometry of the skimmer cone is an important factor for signal enhancement and the reduction of oxide and hydride yields by the addition of nitrogen. In addition, the increased Zr/Rb ratio by the addition of nitrogen indicated the reduction of ICP-related elemental fractionation. We successfully apply the S + X cone with Ar–N2 mixed plasma to the analysis of low content REEs in four geological reference materials at a 16 μm single-hole ablation mode by LA-ICP-MS.
中文翻译：
视锥组合对LA-ICP-MS中氮对信号增强的影响†
提出了各种锥形组合对LA-ICP-MS中氮信号增强的影响。在Ar等离子体中，与标准样品锥+ H分离锥（S + H锥）相比，标准样品锥+ X分离锥（S + X锥）对大多数被研究元素的灵敏度提高了1.5-9.7倍。 。对于S + H锥，添加氮对通过LA-ICP-MS获得的元素的敏感性的影响最小，但对于S + X锥则显着。通过添加氮使信号增强的程度与元素的氧化物键解离能成正相关。与Ar等离子体相比，Ar–N 2混合等离子体中的氧化物比率（N 2 = 4 ml min -1）在S + H锥中从31.5％降低到1.8％，在S + X锥中从88.7％降低到12.6％。通过分别添加氮气（4 ml min -1），在S + H锥和S + X锥中，氢化物产率也分别降低了10倍和46倍。我们的结果表明，撇渣锥的几何形状是信号增强以及通过添加氮降低氧化物和氢化物产率的重要因素。另外，通过添加氮增加的Zr / Rb比表明ICP相关元素的分馏减少。我们成功地将带有Ar–N 2混合等离子体的S + X锥应用于通过LA-ICP-MS在16μm单孔烧蚀模式下分析四种地质参考材料中的低含量REE。
更新日期：2018-04-20
中文翻译：
视锥组合对LA-ICP-MS中氮对信号增强的影响†
提出了各种锥形组合对LA-ICP-MS中氮信号增强的影响。在Ar等离子体中，与标准样品锥+ H分离锥（S + H锥）相比，标准样品锥+ X分离锥（S + X锥）对大多数被研究元素的灵敏度提高了1.5-9.7倍。 。对于S + H锥，添加氮对通过LA-ICP-MS获得的元素的敏感性的影响最小，但对于S + X锥则显着。通过添加氮使信号增强的程度与元素的氧化物键解离能成正相关。与Ar等离子体相比，Ar–N 2混合等离子体中的氧化物比率（N 2 = 4 ml min -1）在S + H锥中从31.5％降低到1.8％，在S + X锥中从88.7％降低到12.6％。通过分别添加氮气（4 ml min -1），在S + H锥和S + X锥中，氢化物产率也分别降低了10倍和46倍。我们的结果表明，撇渣锥的几何形状是信号增强以及通过添加氮降低氧化物和氢化物产率的重要因素。另外，通过添加氮增加的Zr / Rb比表明ICP相关元素的分馏减少。我们成功地将带有Ar–N 2混合等离子体的S + X锥应用于通过LA-ICP-MS在16μm单孔烧蚀模式下分析四种地质参考材料中的低含量REE。
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