Confirmation of 40Ar+ related product ions in the octopole reaction cell of an ICP-QMS/QMS with 18O2 enriched oxygen as the reaction cell gas. Issue 4 (10th February 2017)

• Record Type: Journal Article
• Authors: Zhu, Yanbei; Nakano, Kazumi; Shikamori, Yasuyuki
• Is Part Of: Journal of analytical atomic spectrometry. Volume 32:Issue 4(2017)
• Page Start: 816
• Page End: 821
• Publication Date: 2017-02-10
• Subjects: Atomic spectra -- Periodicals; Atomic absorption spectroscopy -- Periodicals; 543.0858
• DOI: 10.1039/c6ja00453a
• Languages: English
• ISSNs: 0267-9477

Abstract

Abstract : 18 O2 gas was applied to investigate the product ions in a reaction cell with 40 Ar + as a starting ion. Abstract : 40 Ar + related product ions in an octopole reaction cell (ORC) were observed with an inductively coupled plasma tandem quadrupole mass spectrometer (ICP-QMS/QMS). In order to simplify the ion composition of the plasma, the carrier gas was directly connected to the torch injector, i.e. without introduction of the sample solution. The m / z of the first QMS was set to 40 permitting the passage of 40 Ar + . Isotope enriched oxygen gas ( 18 O2 ) was used as the reaction gas in order to separate the spectra of O3 + and Ar2 O 2+ . The intensities of the ions produced in the ORC were measured by the second QMS. As the products of the reactions among 40 Ar + ions and 18 O2 molecules in the ORC, the following ions were observed: 18 O +, 18 O2 +, 18 O3 +, 18 O4 +, 40 Ar 18 O +, 40 Ar 18 O 2+, 40 Ar2 18 O 2+, and 40 Ar 18 O2 2+ . At a reaction gas flow rate of 0.3 mL min −1, the ionic species with the highest signal intensity was 18 O2 +, followed by 40 Ar + and 18 O + . The maximum signal intensities of different product ions were obtained at different flow rates of the reaction gas. A lower flow rate of the reaction gas benefited the production of 40 Ar 18 O + and 18 O3 +, while a higher flow rate of the reaction gas benefited the production of 40 Ar 18 O 2+ and 40 Ar2 18 O 2+ . The maximum transfer efficiency from 40 Ar + to the resulting ionic species was 91%, 2.0%, and 0.12% for 18 O2 +, 18 O +, and 40 Ar 18 O +, respectively. The maximum transfer efficiency to the other investigated ionic species was less than 0.023%. By using 18 O2 as the reaction gas, the mechanisms of 40 Ar + resulted ionic species interfering with the measurement of 32 S 16 O + were confirmed. The results showed that the contributions of 16 O3 + and 40 Ar2 O 2+ were almost equivalent to each other.