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Spectral Detection of Metal Contaminants in Water Using an On-Chip Microglow Discharge.
- Source :
-
IEEE Transactions on Electron Devices . Dec2002, Vol. 49 Issue 12, p2317. 6p. 3 Black and White Photographs, 4 Diagrams, 13 Graphs. - Publication Year :
- 2002
-
Abstract
- This paper reports on the detection of trace contaminants in water by spectroscopy of micro glow discharges that operate in air or at moderate vacuum using liquid electrodes. A liquid electrode spectral emission chip (LEd-SpEC) has been developed to perform this function. The device is fabricated by a four mask process, and provides a reservoir and channels in a glass substrate, along with electrodes that bias the water sample. Liquid from the cathode is sputtered into the discharge, for spectroscopic detection of impurities. Using a commercial spectrometer, Na concentrations <10 ppm, and Pb concentrations of 5 ppm, and Al and Cr concentrations of 10 ppm have been measured. The ratio of Na spectral intensity to that of ambient N[sub 2] is shown to be a suitable measure of Na impurity concentration over several orders of magnitude. The addition of HNO[sub 3] to lower the pH of the liquid solution increases this ratio by almost an order of magnitude. By selectively doping the solution, the device can also he used as a customizable optical source for UV and visible wavelengths. [ABSTRACT FROM AUTHOR]
- Subjects :
- *TRACE metals
*WATER pollution
*SPECTRUM analysis
Subjects
Details
- Language :
- English
- ISSN :
- 00189383
- Volume :
- 49
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Electron Devices
- Publication Type :
- Academic Journal
- Accession number :
- 9202315
- Full Text :
- https://doi.org/10.1109/TED.2002.805608