A Chip-Based Capillary Electrophoresis-Contactless Conductivity Microsystem for Fast Measurements of Low-Explosive Ionic Components
NEW MEXICO STATE UNIV LAS CRUCES
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A miniaturized analytical system for separating and detecting inorganic explosive residues, based on the coupling of a micromachined capillary electrophoresis CE chip with a contactless conductivity detector is described. The low electroosmotic flow EOF of the polymethylmethacrylate PMMA chip material facilitates the rapid switching between analyses of cations and anions using the same microchannel and run buffer and without an EOF modifier, and hence offers rapid 1 min measurement of seven explosive-related cations and anions. Experimental parameters relevant to the separation and detection processes have been optimized. Addition of a l8-crown-6 ether modifier has been used for separating the peaks of co-migrating potassium and ammonium ions. The ionic-explosive microchip system combines the distinct advantages of contactless conductivity detection with the attractive features of plastic CE microchips. The new microsystem offers great promise for monitoring explosive-related ions at the sample source, with significant advantages of speedwarning, efficiency, cost, or sample size.
- Physical Chemistry
- Electrical and Electronic Equipment
- Ammunition and Explosives