SERDP Project Final Report: Integrated Automated Analyzer for Monitoring of Explosives in Groundwater

Lin, Yuehe ; Collins, Greg ; Wang, Joseph

Pacific Northwest National Laboratory (U.S.)

关键词: Microanalysis Electrochemical Sensor;    Monitoring;    Chemical Explosives;    Ground Water;    Remedial Action;   

DOI  :  10.2172/15010545
RP-ID  :  PNNL-14463
RP-ID  :  AC05-76RL01830
RP-ID  :  15010545

美国|英语

来源: UNT Digital Library

【 摘 要 】

The objective of this project is to develop a portable analytical system based on the on-line/on-chip coupling of a miniaturized sample processing system with a microfabricated capillary electrophoresis/electrochemical detector for fast separation/detection of explosives and their degradation products in groundwater. Such a system has the potential to provide reliable, cost-effective characterization of groundwater contamination at DoD sites that are undergoing closure and remediation. A capillary electrophoresis (CE) microdevice, based on the combination of microfabricated separation chips and thick-film electrochemical detector strips, was developed. The microdevice consists of a planar screen-printed carbon line electrode mounted perpendicular to the now direction. Such coupling obviates the need for permanent attachment of the detector, to allow easy and fast replacement of the working electrode. Variables influencing the separation efficiency and amperometric response, including the channel-electrode spacing, separation voltage, or detection potential, are assessed and optimized. The versatility, simplicity, and low-cost advantages of the design are coupled to an attractive performance, with submicromolar detection limits, and good precision. Applicability for assays of mixtures of nitroaromatic explosives has been demonstrated. On-line coupling of preconcentration/microchip separation for explosives will also be presented.