Sensors 2012, 12(5), 6576-6586; doi:10.3390/s120506576
Review

A Critical Review of Published Data on the Gas Temperature and the Electron Density in the Electrolyte Cathode Atmospheric Glow Discharges

1 Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary 2 Aqua-Concorde Water Analysis R&D LLC, T. Meisel Laboratory, Budapest, Hungary
* Author to whom correspondence should be addressed.
Received: 24 April 2012; in revised form: 8 May 2012 / Accepted: 16 May 2012 / Published: 18 May 2012
(This article belongs to the Section Chemical Sensors)
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Abstract: Electrolyte Cathode Discharge (ELCAD) spectrometry, a novel sensitive multielement direct analytical method for metal traces in aqueous solutions, was introduced in 1993 as a new sensing principle. Since then several works have tried to develop an operational mechanism for this exotic atmospheric glow plasma technique, however these attempts cannot be combined into a valid model description. In this review we summarize the conceptual and technical problems we found in this upcoming research field of direct sensors. The TG gas temperature and the ne electron density values published up to now for ELCAD are very confusing. These data were evaluated by three conditions. The first is the gas composition of the ELCAD plasma, since TG was determined from the emitted intensity of the N2 and OH bands. Secondly, since the ELCAD is an atmospheric glow discharge, thus, the obtained TG has to be close to the Te electron temperature. This can be used for the mutual validation of the received temperature data. Thirdly, as a consequence of the second condition, the values of TG and ne have to agree with the Engel-Brown approximation of the Saha-equation related to weakly ionized glow discharge plasmas. Application of non-adequate experimental methods and theoretical treatment leads to unreliable descriptions which cannot be used to optimize the detector performance.
Keywords: direct multielement sensor; metals in water; atmospheric glow plasma

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MDPI and ACS Style

Mezei, P.; Cserfalvi, T. A Critical Review of Published Data on the Gas Temperature and the Electron Density in the Electrolyte Cathode Atmospheric Glow Discharges. Sensors 2012, 12, 6576-6586.

AMA Style

Mezei P, Cserfalvi T. A Critical Review of Published Data on the Gas Temperature and the Electron Density in the Electrolyte Cathode Atmospheric Glow Discharges. Sensors. 2012; 12(5):6576-6586.

Chicago/Turabian Style

Mezei, Pál; Cserfalvi, Tamás. 2012. "A Critical Review of Published Data on the Gas Temperature and the Electron Density in the Electrolyte Cathode Atmospheric Glow Discharges." Sensors 12, no. 5: 6576-6586.

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