title: Simultaneous determination of organic and cationic species in explosives residues with column-switching liquid chromatography-ion chromatography system.
abstract: A new column-switching method has been proposed for the determination of 14 organic explosives (1,3,5,7-tetranitro-N-methylaniline, 1,3,5-trinitro-1,3,5-triazacyclohexane, 1,3,5-trinitrobenzene, 1,3-dinitrobenzene, nitrobenzene, 2,4,6-N-tetranitro-N-methylaniline, Trinitrotoluene, 4-amino-2,6-dinitrotoluene, 2-amino-4,6-dinitrotoluene, 2,6-dinitrotoluene, 2,4-dinitrotoluene, 2-nitrotoluene, 4-nitrotoluene, and 3-nitrotoluene) and/or five inorganic cations (Na(+), NH(4)(+), K(+), Mg(2+), and Ca(2+)) using liquid chromatography linked to ion chromatography by a switching valve. The mobile phase was methanol-water (40/60, v/v) for a C18 reversed-phase column and 3 mM of methanesulfonic acid (pH 2.5) for a cation-exchange column, respectively. Under the optimal conditions, the 14 organic explosives and the five inorganic cations were separated and detected simultaneously within 45 min. The limits of detection (S/N = 3) of the 14 organic explosives and the five inorganic cations were in the range of 0.0048-0.0333 mg/L and 0.0116-0.1851 mg/L, respectively. The linear correlation coefficients were 0.9971-0.9999, and the relative standard deviation of the retention time and the peak area were 0.02-0.31% and 0.51-3.64%, respectively. The method was successfully applied to the determination of organic explosives and inorganic cations in dust samples.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310028, P.R. China.
authors.forename: Peijin
authors.initials: P
authors.lastname: Xie
authors.forename: Jingang
authors.initials: J
authors.lastname: Xu
authors.forename: Zhenzhen
authors.initials: Z
authors.lastname: Hu
authors.forename: Fawzi
authors.initials: F
authors.lastname: El-Sepai
authors.forename: Zhang
authors.initials: Z
authors.lastname: Peimin
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhu
mesh_terms: D000814:Aniline Compounds / Q000032:analysis*; D001555:Benzene Derivatives / Q000032:analysis*; D002412:Cations / Q000032:analysis; D002852:Chromatography, Ion Exchange / Q000295:instrumentation / Q000379:methods*; D004391:Dust; D004867:Equipment Design; D053834:Explosive Agents / Q000032:analysis*; D008698:Mesylates; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013997:Time Factors; D014227:Triazines / Q000032:analysis
chemical_list: D000814:Aniline Compounds; D001555:Benzene Derivatives; D002412:Cations; D004391:Dust; D053834:Explosive Agents; D008698:Mesylates; D014227:Triazines; C045880:methanesulfonic acid; C009160:cyclonite