Issue 9, 2020

Coupling the liquid sampling – atmospheric pressure glow discharge, a combined atomic and molecular (CAM) ionization source, to a reduced-format mass spectrometer for the analysis of diverse species

Abstract

The LS-APGD microplasma has shown potential as a combined atomic and molecular (CAM) ionization source, though to this point it has been solely interfaced with large, laboratory-scale instruments. There are many instances wherein reduced-format, lower operating overhead, analyzers are appropriate. To this end, the LS-APGD has been coupled with an Advion ExpressionL Compact Mass Spectrometry (CMS) for the analysis of diverse samples. This instrument has been previously travel hardened in accordance to MIL-SPEC-810, demonstrating its suitability for in-field analysis. The coupling of the LS-APGD to this instrument expands its capability for diverse analyses, with early-stage figures of merit presented here. With this new coupling, a thorough optimization of both the instrument ion optics and the LS-APGD operating parameters was necessary as this platform does not have a direct method for collisional dissociation of potentially-deleterious molecular species. Under the optimized conditions, analytical response curves were constructed for Na, Rb, Cs, and Tl, demonstrating detection limits between 17.6–146 ng mL−1 (single ng, absolute). Furthermore, CAM sampling capabilities can be realized upon changing from a 2% HNO3 to a 70 : 30 MeOH : H2O solvent system, providing molecular-level chemical information readily obtained from atomic ionization sources such as the inductively coupled plasma (ICP-MS). Here detection limits between 1–32 nM (single pg, absolute) were obtained for caffeine, acetaminophen, Δ9-tetrahydrocannabidiol, sulfadimethoxine, terfenadine, and reserpine. The unique features of the CAM ionization source on this flexible MS platform hold promise for many operation environments.

Graphical abstract: Coupling the liquid sampling – atmospheric pressure glow discharge, a combined atomic and molecular (CAM) ionization source, to a reduced-format mass spectrometer for the analysis of diverse species

Supplementary files

Article information

Article type
Paper
Submitted
06 Ube 2020
Accepted
20 Mot 2020
First published
28 Mot 2020

J. Anal. At. Spectrom., 2020,35, 1910-1921

Coupling the liquid sampling – atmospheric pressure glow discharge, a combined atomic and molecular (CAM) ionization source, to a reduced-format mass spectrometer for the analysis of diverse species

T. J. Williams and R. K. Marcus, J. Anal. At. Spectrom., 2020, 35, 1910 DOI: 10.1039/D0JA00094A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements