The purpose of this paper is to present a study on miniaturized instruments for analytical chemistry with a microplasma as the excitation source.
The atmospheric pressure glow microdischarge could be ignited inside a ceramic structure between a solid anode and a liquid cathode. As a result of the cathode sputtering of the solution, it was possible to determine its chemical composition by analyzing the emission spectra of the discharge. Cathodes with microfluidic channels and two types of anodes were constructed. Both types were tested through experimentation. Impact of the electrodes geometry on the discharge was established. A cathode aperture of various sizes and anodes made from different materials were used.
The spectroscopic properties of the discharge and its usefulness in the analysis depended on the ceramic structure. The surface area of the cathode aperture and the flow rate of the solution influence on the detection limits (DLs) of Zn and Cd.
Constructed ceramic structures were able to excite elements and their laboratory-size systems. During the experiments, Zn and Cd were detected with DLs 0.024 and 0.053 mg/L, respectively.
The authors wish to thank the National Science Centre of the Republic of Poland (under grant no. 2016/21/N/ST7/01618) and Wroclaw University of Science and Technology (statutory activity) for financial support.
Matusiak, T., Swiderski, K., Macioszczyk, J., Jamroz, P., Pohl, P. and Golonka, L. (2020), "Element sensor based on microplasma generators", Sensor Review, Vol. 40 No. 4, pp. 437-444. https://doi.org/10.1108/SR-11-2019-0259Download as .RIS
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