Towards the reduction of matrix effects in inductively coupled plasma optical emission spectrometry: an argon–nitrogen–hydrogen mixed-gas plasma for the analysis of geological and environmental samples†,Journal of Analytical Atomic Spectrometry

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Towards the reduction of matrix effects in inductively coupled plasma optical emission spectrometry: an argon–nitrogen–hydrogen mixed-gas plasma for the analysis of geological and environmental samples†
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2017-05-15 00:00:00 , DOI: 10.1039/c7ja00112f
Yoseif Makonnen _{1,

2,

3,

4} , William R. MacFarlane _{4,

5,

6} , Majdi L. Geagea _{4,

6,

7} , Diane Beauchemin _{1,

2,

3,

4}

Affiliation

An argon–nitrogen–hydrogen mixed-gas plasma was optimized towards the minimization of matrix effects in inductively coupled plasma optical emission spectrometry. Analyte sensitivity was enhanced by a factor of 1 to 4 (n = 26 elements) upon adding 3.7% v/v N₂ to the plasma gas and 1.1% v/v H₂ as a sheath around the Ar nebulizer gas flow in the central channel. However, detection limits were on average similar when using the mixed-gas plasma versus the Ar plasma, although at least 2-fold improvements resulted for Al and Ca in presence of 5% m/v Na. The 8.9 ± 1.7% (n = 26 elements) analyte signal suppression with an Ar plasma in a 0.23% m/v (or 0.1 M) Na matrix was reduced to 5.6 ± 2.3% with the mixed-gas plasma. The mixed-gas plasma was significantly more robust, with a Mg II/Mg I ratio of 13.3 ± 0.1 (n = 5 replicates), compared to 9.87 ± 0.16 for an Ar plasma optimized for robustness. The plasma excitation temperature also increased by 717 K for the mixed-gas plasma, confirming the improved excitation conditions. The superior analytical performance of the robust mixed-gas plasma for complex sample matrices was demonstrated through the direct quantitative multi-elemental analysis of a variety of certified reference materials (i.e., lake sediment, till, stream sediment, and natural ore digests), without internal standardization or matrix-matched calibration.

中文翻译：

为了减少电感耦合等离子体发射光谱法中的基体效应：用于分析地质和环境样品的氩气-氮-氢混合气体等离子体†

优化了氩-氮-氢混合气体等离子体，以使感应耦合等离子体光发射光谱法中的基体效应最小化。在向等离子体气体中添加3.7％v / v N ₂和作为围绕Ar雾化器气流的鞘层的1.1％v / v H _2时，分析物灵敏度提高了1-4倍（n = 26个元素）渠道。但是，使用混合气体等离子体与Ar等离子体时，检测限平均相似，尽管在存在5％m / v Na的情况下，Al和Ca至少提高了2倍。8.9±1.7％（n在混合气体等离子体中，在0.23％m / v（或0.1 M）的Na基体中使用Ar等离子体抑制了26种元素的分析物信号抑制，降低到5.6±2.3％。混合气体等离子体具有更强的鲁棒性，Mg II / Mg I比为13.3±0.1（n = 5次重复），而针对鲁棒性进行了优化的Ar等离子体则为9.87±0.16。对于混合气体等离子体，等离子体激发温度也增加了717 K，从而确认了改善的激发条件。通过对多种认证参考物质（即，即标准品）进行直接定量多元素分析，证明了鲁棒混合气体等离子体对复杂样品基质的出色分析性能。，湖泊沉积物，耕作，河流沉积物和天然矿石消化物），而无需内部标准化或基质匹配的校准。

更新日期：2017-05-15

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