期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 135, 期 2, 页码 618-624出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.09.022
关键词
Electrochemical sensor; Chronocoulometry; Nitrate sensor; Microfabrication
资金
- NSF [NSF CCR-0120778]
A simple, miniaturized, and yet sensitive electrochemical nitrate sensor has been designed, fabricated and tested. The thin-film silver sensing electrode, silver-oxide reference electrode, and platinum counter electrode are microfabricated on a silicon substrate. A polyimide insulation layer is also patterned to improve reliability of a sensor chip. The sensor chip incorporates microfluidic channels. A fixture is also created to integrate the sensor chip and fluidic connectors for on-line flow-through analysis. The electrolyte is 0.01 M sodium hydroxide. The nitrate concentration is determined by double-potential-step chronocoulometry (DPSC) because it improves signal-to-noise ratio compared to amperometry and minimizes oxygen background current. Interference analysis of DPSC with 10 ions commonly found in groundwater indicates that HPO(4)(2-)/PO(4)(3-), Ca(2+), and Sr(2+) cause significant interference (i.e., more than 20% signal distortion). Performance characterization of sensor chips indicates that the limit of detection (LOD) and the upper limit of the linear range have a chip-to-chip variation of 4-75 mu M and 500-2000 mu M, respectively. (c) 2008 Elsevier B.V. All rights reserved.
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