title: Simultaneous determination of nitroaromatic compounds in water using capillary electrophoresis with amperometric detection on an electrode modified with a mesoporous nano-structured carbon material.
abstract: 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) μg/L, with correlation coefficients higher than 0.9992. And the detection limits were established between 3.0 and 4.7 μg/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.
authors.affiliation: Department of Chemistry and Shanghai Key Laboratory of Green Chemistry and Chemical Process, East China Normal University, 3663 Zhongshan Road N., Shanghai, P. R. China.
authors.forename: Dongxia
authors.initials: D
authors.lastname: Nie
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Dan
authors.initials: D
authors.lastname: Zhang
authors.forename: Tianshu
authors.initials: T
authors.lastname: Zhou
authors.forename: Ying
authors.initials: Y
authors.lastname: Liang
authors.forename: Guoyue
authors.initials: G
authors.lastname: Shi
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004566:Electrodes; D019075:Electrophoresis, Capillary / Q000379:methods*; D004784:Environmental Monitoring / Q000379:methods; D016014:Linear Models; D053758:Nanoparticles; D009578:Nitrobenzenes / Q000032:analysis*; D016062:Porosity; D045483:Rivers / Q000737:chemistry; D012680:Sensitivity and Specificity; D012722:Sewage / Q000737:chemistry; D014303:Trinitrotoluene / Q000032:analysis*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009578:Nitrobenzenes; D012722:Sewage; D014874:Water Pollutants, Chemical; D014867:Water; D014303:Trinitrotoluene; D002244:Carbon