title: Optimization of separation of heavy metals by capillary electrophoresis with contactless conductivity detection.
abstract: The separation of four toxic metal ions (Cr(3+) , Pb(2+) , Hg(2+) , Ni(2+) ) was achieved by optimizing the composition of the histidine/tartaric acid background electrolyte. An on-column preconcentration technique, viz. field amplified sample injection, was performed to improve the sensitivity. This method afforded an enhancement factor of up to 91,800 fold with the LODs ranging from 0.005 to 2.32 μg/L, which were well below the maximum contaminant levels set by the United States Environmental Protection Agency. The robustness of this method was demonstrated with its application to the analysis of real samples including tap water, drain water, and reservoir water with recoveries between 90 and 120%.
authors.affiliation: Department of Chemistry, National University of Singapore, Republic of Singapore.
authors.forename: Hiu Fung
authors.initials: HF
authors.lastname: Lau
authors.forename: Ngee Mian
authors.initials: NM
authors.lastname: Quek
authors.forename: Wai Siang
authors.initials: WS
authors.lastname: Law
authors.forename: Jian Hong
authors.initials: JH
authors.lastname: Zhao
authors.forename: Peter C
authors.initials: PC
authors.lastname: Hauser
authors.forename: Sam Fong Yau
authors.initials: SF
authors.lastname: Li
mesh_terms: D000097:Acetonitriles; D004553:Electric Conductivity; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000032:analysis / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*; D014881:Water Supply / Q000032:analysis
chemical_list: D000097:Acetonitriles; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; C032159:acetonitrile