title: Simultaneous determination of low-molecular-weight organic acids and chlorinated acid herbicides in environmental water by a portable CE system with contactless conductivity detection.
abstract: This report describes a method to simultaneously determine 11 low-molecular-weight (LMW) organic acids and 16 chlorinated acid herbicides within a single run by a portable CE system with contactless conductivity detection (CCD) in a poly(vinyl alcohol) (PVA)-coated capillary. Under the optimized condition, the LODs of CE-CCD ranged from 0.056 to 0.270 ppm, which were better than for indirect UV (IUV) detection of the 11 LMW organic acids or UV detection of the 16 chlorinated acid herbicides. Combined with an on-line field-amplified sample stacking (FASS) procedure, sensitivity enhancement of 632- to 1078-fold was achieved, with satisfactory reproducibility (RSDs of migration times less than 2.2%, and RSDs of peak areas less than 5.1%). The FASS-CE-CCD method was successfully applied to determine the two groups of acidic pollutants in two kinds of environmental water samples. The portable CE-CCD system shows advantages such as simplicity, cost effectiveness, and miniaturization. Therefore, the method presented in this report has great potential for onsite analysis of various pollutants at the trace level.
authors.affiliation: Department of Chemistry, National University of Singapore, Singapore, Republic of Singapore.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.forename: Weilong
authors.initials: W
authors.lastname: Wang
authors.forename: Sam Fong Yau
authors.initials: SF
authors.lastname: Li
mesh_terms: D019075:Electrophoresis, Capillary / Q000295:instrumentation* / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D039703:Logical Observation Identifiers Names and Codes; D008970:Molecular Weight; D009930:Organic Chemicals / Q000032:analysis; D011142:Polyvinyl Alcohol; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006540:Herbicides; D006843:Hydrocarbons, Chlorinated; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D011142:Polyvinyl Alcohol