Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 31, Issue 10, Pages 2037-2044Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ja00213g
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Funding
- National Nature Science Foundation of China [61205149]
- Science Research Funds of Chongqing Municipal Education Commission [KJ1500436]
- Scientific and Technological Talents Training Project of Chongqing [CSTC2013kjrc-qnrc40002]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry)
- State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University) [2007DA10512714409]
- Key Project of Foundation and Advanced Technology Research Project of CQ CSTC [cstc2015jcyjB0358]
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A novel atmospheric-pressure plasma source has been developed for the detection of metal ions in aqueous solution by optical emission spectrometry. In contrast to the common solution cathode glow discharge, this source is sustained by using an alternating-current power supply coupled with a high voltage diode. The electrical characteristics and spectral characteristics of this plasma source are discussed. The effects of operating parameters, including the acid anion, electrolyte pH, discharge voltage, discharge frequency, inter-electrode distance, sample flow rate and vertical distributions of spectral signals, are investigated. The spectral intensities and standard deviations (SDs) of background signals of this source are much lower than those of other electrolyte-electrode devices. In addition, metal element emissions have the same optimum spectral emission positions in the plasma. The detection limits of Li, Na, K, Rb, Cs, Sr and Mg are determined to be 0.0054, 0.0011, 0.0029, 0.04, 0.054, 2.5 and 0.26 mg L-1, respectively. The proposed excitation source provides a promising technique for the detection of metal ions in aqueous solution samples.
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