Parametric optimization and spectral line selection for liquid sampling-atmospheric pressure glow discharge – optical emission spectroscopy

Literature Information

Publication Date 2019-11-07
DOI 10.1039/C9JA00325H
Impact Factor 4.023
Authors

Katja A. Hall, R. Kenneth Marcus


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Abstract

A design-of-experiment (DOE) parameterization was performed with the liquid sampling-atmospheric pressure glow discharge (LS-APGD) optical emission spectroscopy (OES) system to establish the optimal powering mode and operating conditions that allow for maximum signal intensity, signal-to-background (S/B) ratio, and signal-to-noise (S/N) ratio. Different from other APGD sources, the operation principles of the LS-APGD provide alternative means of applying the discharge potential. As a result of this parameterization, the sensitivity of the LS-APGD was dramatically improved, as noted by the ∼30× improvement in limit of detection (LOD), now 0.8 μg mL−1 for 20 μL injections, versus earlier reports, with the solution-grounded cathode (SGC) found to be the preferred powering mode. Using the parameters from the DOE analysis, a line selection evaluation was performed for Ag, Ca, Cr, Cu, K, Mg, Na, and Zn as test elements. The best emission lines for analytical performance determination and future works were determined by measuring the stability and signal intensity for all observed lines. The chosen lines were probed for sensitivity by acquiring calibration curves for each of the analytes' transitions. When single-element solutions were used, the LODs acquired for many of the analytes were superior to previously reported LS-APGD results. While the sensitivity of the LS-APGD-OES is lower than that of an ICP-OES, the LODs for the LS-APGD are likely acceptable for those applications where portability and low-cost instrumentation are desired.

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Journal of Analytical Atomic Spectrometry

Journal of Analytical Atomic Spectrometry
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The Journal of Analytical Atomic Spectrometry (JAAS) is the central journal for publishing innovative research on fundamentals, instrumentation, and methods in the determination, speciation and isotopic analysis of (trace) elements within all fields of application. This includes, but is not restricted to, the most recent progress, developments and achievements in all forms of atomic and elemental detection, isotope ratio determination, molecular analysis, plasma-based analysis and X-ray techniques. The journal welcomes full papers, communications, technical notes, critical and tutorial review articles, editorials, and comments, in addition to the Atomic Spectrometry Updates (ASU) literature reviews that are prepared by an expert panel. Submissions are welcome in the following areas, but note this list reflects the current scope and authors are strongly encouraged to contact the Editorial team if they believe that their work offers potentially new and emerging research relevant to the journal remit: Fundamental studies in the following. New and existing sources for atomic emission, absorption, fluorescence and mass spectrometry and those that provide both atomic and molecular information Sample introduction techniques for solids, liquids, gases Improvements in sensitivity, selectivity, precision, accuracy and/or robustness Isotope ratio measurements, including techniques for improving precision and mass bias correction Single channel and multichannel simultaneous detection systems Chemometrics, statistics, calibration techniques and internal standardisation Theoretical and numerical modelling of fundamental processes related to all of the above methodologies Novel or improved methodologies in areas of application including, but not limited to the following. Biosciences, including elemental, speciation and isotopic analysis in biological systems, immunoassays based on metal-labeled antibodies, bio-imaging, and nanoparticle toxicology Geochemistry Environmental science Materials science, including engineered nanoparticles and quantum dots Metrology, including reference materials Forensic analysis Food and agricultural sciences Energy Archaeometry Molecular analysis. Molecular sources for elemental and isotopic analysis Atomic sources for molecular analysis Atomic and molecular techniques simultaneously used for complementary chemical information All contributions are judged on originality and quality of scientific content, and appropriateness of length to content of new science.

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