Determination of isotope fractionation of Cr(III) during oxidation by LC/low-resolution MC-ICPMS,Journal of Analytical Atomic Spectrometry

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Determination of isotope fractionation of Cr(III) during oxidation by LC/low-resolution MC-ICPMS
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020/02/03 , DOI: 10.1039/c9ja00388f
Jakub Karasiński _{1,

2,

3,

4,

5} , Cuc Thi Nguyen-Marcińczyk _{1,

2,

3,

4,

5} , Marcin Wojciechowski _{1,

2,

3,

4,

5} , Ewa Bulska _{1,

2,

3,

4,

5} , Ludwik Halicz _{1,

2,

3,

4,

5}

Affiliation

A robust and sensitive method for the precise isotopic analysis of ⁵³Cr/⁵⁰Cr during Cr(III) oxidation by coupling ion pair reversed-phase chromatography and Multicollector Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS) is presented. The effective separation of Cr(III) and Cr(VI) species from a sample matrix by HPLC enables on-line isotopic determination of the ⁵³Cr/⁵⁰Cr ratio in transient signals by MC-ICPMS, without the laborious off-line and time consuming sample preparation step associated with a high probability of speciation changes. Mass discrimination and instrument drift were corrected by the sample-standard bracketing method using the ⁵³Cr/⁵⁰Cr isotope ratio of SRM 979 as the standard. The obtained results show good precision but are still approximately two-three times worse than the high precision results achieved by TIMS and MC-ICPMS with off-line Cr separation. Robustness, acceptable precision and accuracy, as well as a minimum possibility of sample contamination, of the developed analytical method have been demonstrated in complex natural samples of natural water (IAPSO standard water) and a standard spiked with several metal ions.

中文翻译：

LC /低分辨率MC-ICPMS测定氧化过程中Cr（III）的同位素分馏

提出了一种健壮而灵敏的方法，该方法通过耦合离子对反相色谱和多收集器电感耦合等离子体质谱法（MC-ICPMS）对Cr（III）氧化过程中的⁵³ Cr / ⁵⁰ Cr同位素进行精确分析。通过HPLC有效地从样品基质中分离出Cr（III）和Cr（VI）物种，可通过MC-ICPMS在线测定瞬态信号中的⁵³ Cr / ⁵⁰ Cr比值，而无需费力的离线和时间样品制备步骤耗时，且物种形成的可能性很高。质量歧视和仪器漂移通过样品标准包围法使用标准SRM 979的⁵³ Cr /⁵⁰ Cr同位素比。所获得的结果显示出良好的精度，但仍比采用离线Cr分离的TIMS和MC-ICPMS所获得的高精度结果差大约三分之二。在复杂的天然水（IAPSO标准水）和掺有多种金属离子的标准天然样品中，已证明了所开发分析方法的坚固性，可接受的精度和准确性以及对样品污染的最小可能性。

更新日期：2020-03-12

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