Issue 4, 2017

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

Abstract

40Ar+ 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 40Ar+. Isotope enriched oxygen gas (18O2) was used as the reaction gas in order to separate the spectra of O3+ and Ar2O2+. The intensities of the ions produced in the ORC were measured by the second QMS. As the products of the reactions among 40Ar+ ions and 18O2 molecules in the ORC, the following ions were observed: 18O+, 18O2+, 18O3+, 18O4+, 40Ar18O+, 40Ar18O2+, 40Ar218O2+, and 40Ar18O22+. At a reaction gas flow rate of 0.3 mL min−1, the ionic species with the highest signal intensity was 18O2+, followed by 40Ar+ and 18O+. 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 40Ar18O+ and 18O3+, while a higher flow rate of the reaction gas benefited the production of 40Ar18O2+ and 40Ar218O2+. The maximum transfer efficiency from 40Ar+ to the resulting ionic species was 91%, 2.0%, and 0.12% for 18O2+, 18O+, and 40Ar18O+, respectively. The maximum transfer efficiency to the other investigated ionic species was less than 0.023%. By using 18O2 as the reaction gas, the mechanisms of 40Ar+ resulted ionic species interfering with the measurement of 32S16O+ were confirmed. The results showed that the contributions of 16O3+ and 40Ar2O2+ were almost equivalent to each other.

Graphical abstract: 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

Article information

Article type
Technical Note
Submitted
21 des 2016
Accepted
23 jan 2017
First published
24 jan 2017

J. Anal. At. Spectrom., 2017,32, 816-821

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

Y. Zhu, K. Nakano and Y. Shikamori, J. Anal. At. Spectrom., 2017, 32, 816 DOI: 10.1039/C6JA00453A

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