High-voltage contactless conductivity detection of metal ions in capillary electrophoresis.
The detection of alkali, alkaline earth and heavy metal ions with a high-voltage capacitively coupled contactless conductivity detector (HV-C(4)D) was investigated. Eight alkali, alkaline earth metal ions and ammonium could be separated in less than 4 min with detection limits in the order of 5 x 10(-8) M. The heavy metals Mn2+, Pb2+, Cd2+ Fe2+, Zn2+, Co2+, Cu2+ and Ni2+ could also be successfully resolved with a 10 mM 2-(N-morpholino)ethanesulfonic acid/DL-histidine (MES/His)-buffer. Zn2+, Co2+, Cu2+ and Ni2+ showed an indirect response. The detection limits for the heavy metals were determined to range from about 1 to 5 microM.
Tanyanyiwa
Jatisai
J
The University of Basel, Department of Chemistry, Basel, Switzerland.
Hauser
Peter C
PC
D002412:Cations / Q000032:analysis; D003217:Conductometry; D019075:Electrophoresis, Capillary / Q000295:instrumentation* / Q000379:methods / Q000592:standards; D004867:Equipment Design; D008672:Metals, Alkali / Q000032:analysis; D008673:Metals, Alkaline Earth / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D012680:Sensitivity and Specificity
D002412:Cations; D008672:Metals, Alkali; D008673:Metals, Alkaline Earth; D019216:Metals, Heavy