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Microfabricated Electrochemical Nitrate Sensor Using Double-potential-step Chronocoulometry

机译:双电位步进计时库仑法的微细电化学硝酸盐传感器

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摘要

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 μM and 500-2000 μM, respectively.
机译:已经设计,制造和测试了一种简单,小型但灵敏的电化学硝酸盐传感器。薄膜银感测电极,氧化银参比电极和铂对电极被微加工在硅基板上。聚酰亚胺绝缘层也被图案化以提高传感器芯片的可靠性。传感器芯片具有微流体通道。还创建了一个夹具,以集成传感器芯片和流体连接器以进行在线流通分析。电解质是0.01 M氢氧化钠。硝酸盐浓度由双电势计时库仑法(DPSC)确定,因为与安培法相比,它提高了信噪比,并使氧气本底电流最小。 DPSC对地下水中常见的10种离子的干扰分析表明,HPO_4〜(2-)/ PO_4〜(3-),Ca〜(2+)和Sr〜(2+)会引起显着干扰(即大于20 %信号失真)。传感器芯片的性能表征表明,检测极限(LOD)和线性范围的上限的芯片间差异分别为4-75μM和500-2000μM。

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