提高六极碰撞池 MC-ICP-MS（Nu Sapphire）钾同位素分析中浓度不匹配耐受性的实验研究,Journal of Analytical Atomic Spectrometry

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提高六极碰撞池 MC-ICP-MS（Nu Sapphire）钾同位素分析中浓度不匹配耐受性的实验研究
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2023-01-23 , DOI: 10.1039/d3ja00022b
Wenjun Li ₁ , Ye Zhao ₂ , Benxun Su _{1,

3} , Bingyu Gao ₁ , Jing Wang ₁ , Shanke Liu ₁

Affiliation

碰撞池多接收电感耦合等离子体质谱 (CC-MC-ICP-MS) 使使用样品标准包围法进行常规高精度钾 (K) 同位素分析成为可能。然而，正如之前的研究所报道的那样，通常需要样品和标准之间的严格浓度匹配（全球大多数实验室报告的公差 <2%）以避免分析偏差。这种对浓度不匹配的小容忍度自然会导致分析效率低下。为了更好地表征并可能改进这一点，我们对 Nu Sapphire CC-MC-ICP-MS 的六极杆参数进行了一系列实验。结果显示 RF Ref. （施加到六极杆的射频交流电的电压）是控制浓度失配效应的主要参数。对于一组 RF 偏置参考。−0.8 V 的值（六极杆的电位），最佳 RF Ref. 1.05 V 的值由最平坦的部分确定⁴¹ K/³⁹ K 比率与RF Ref. 图已将 K 浓度不匹配的容差从 RF Ref 的 4% 增加到 30%。1.5 V。池气体流速是另一个重要参数，建议 He 和 H₂的最佳值分别为 2 sccm 和 5 sccm 。使用优化参数对浓度不匹配的更高容忍度大大提高了使用 CC-MC-ICP-MS 进行高精度 K 同位素分析的效率，并将开启原位K 同位素测量的可能性。

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Experimental investigation of improved tolerance for concentration mismatch in potassium isotope analysis on a hexapole collision cell MC-ICP-MS (Nu Sapphire)

Collision cell multi-collector inductively coupled plasma mass spectrometry (CC-MC-ICP-MS) has made routine high precision potassium (K) isotope analysis possible using sample-standard bracketing. However, as reported in previous studies, strict concentration match between a sample and bracketing standard (<2% tolerance reported from most labs worldwide) is often required to avoid analytical bias. This small tolerance for concentration mismatch would naturally lead to low analytical efficiency. To better characterize and potentially improve this, we conducted a series of experiments on the hexapole parameters of the Nu Sapphire CC-MC-ICP-MS. The results reveal that RF Ref. (the voltage of the RF alternating current applied to the hexapole rods) is the primary parameter that controls the concentration mismatch effect. For a set RF Bias Ref. value (the potential for the hexapole) of −0.8 V, the optimal RF Ref. value of 1.05 V identified by the flattest part in the ⁴¹K/³⁹K ratio versus RF Ref. plot has increased the tolerance for K concentration mismatch to 30% from 4% at a RF Ref. of 1.5 V. The cell gas flow rate is another important parameter and optimal values of 2 sccm and 5 sccm are recommended for He and H₂, respectively. A much higher tolerance for concentration mismatch using optimized parameters has greatly improved the efficiency of high precision K isotope analyses using CC-MC-ICP-MS and will open the possibility for in situ K isotopic measurements.

更新日期：2023-01-23

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