Determination of explosives in soil and ground water by liquid chromatography-amperometric detection

被引:58
作者
Hilmi, A [1 ]
Luong, JHT [1 ]
Nguyen, AL [1 ]
机构
[1] Natl Res Council Canada, Biotechnol Res Inst, Montreal, PQ H4P 2R2, Canada
关键词
explosives; soil; water analysis; environmental analysis; nitrotoluenes; nitrobenzenes;
D O I
10.1016/S0021-9673(99)00392-1
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Electrochemical reduction of trinitrotoluene (TNT) and several nitroaromatics has been exploited toward the development of an amperometric detector for liquid chromatography (LC). Up to a ten-fold increase in sensitivity was accomplished for the explosives using amperometric detection instead of conventional UV measurement. A working glassy carbon electrode (poised at -0.80 V vs. Ag/AgCl) offered a detection limit of 9, 44 and 550 nM for trinitrobenzene, TNT and 1,4-dinitrobenzene, respectively. Separation of eleven TNT-related compounds in a mixture was achieved within 15 min using a C(18) column and a mobile phase consisting of acetonitrile-50 mM phosphate buffer pH 5 (1:2, v/v) and 18 mM sodium dodecylsulfate. The LC-amperometric detection system was applicable for analyzing soil extracts and ground water and the results obtained agreed well with that of the US Environmental Protection Agency recommended procedure. Extension to analysis of HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) and RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) was accomplished with a silver working electrode instead of a glassy carbon electrode installed in a thin channel cell. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:97 / 110
页数:14
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