期刊
ELECTROPHORESIS
卷 31, 期 17, 页码 2981-2988出版社
WILEY-BLACKWELL
DOI: 10.1002/elps.201000275
关键词
Amperometric detection; CE; Mesoporous carbon material; Nitroaromatic compounds
资金
- National Natural Science Foundation of China [20677016]
- Program for New Century Excellent Talents in University [NCET-07-0293]
- Scientific Research Foundation of State Education Ministry
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
In this article, a carbon disk electrode modified with mesoporous carbon material (CMK-3) was used in CE with amperometric detection system for the simultaneous determination of four types of important nitroaromatic compounds, including 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitrobenzene (TNB), 2,4-dinitrotoluene (DNT) and 1,3-dinitrobenzene (DNB). Compared with the bare carbon electrode, the CMK-3 modified electrode greatly improved the sensitivity at a relatively positive detection potential due to its excellent electrocatalytic activities, high conductivity and large effective surface area. The four analytes could be well separated and detected within 480 s. A good linear response was obtained for TNB, DNB, TNT and DNT from 8.4 to 5.0 x 10(3) mu g/L, with correlation coefficients higher than 0.9992. And the detection limits were established between 3.0 and 4.7 mu g/L for the four investigated nitroaromatic compounds (S/N = 3). The CMK-3-modified electrode was successfully employed to analyze coking wastewater, tap water and river samples with recoveries in the range of 94.8-109.0%, and RSDs less than 5.0%. The presented results demonstrated that the CMK-3-modified carbon electrode used in CE with amperometric detection was of convenient preparation, high sensitivity and good repeatability, which could be employed in the rapid determination of practical samples.
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