title: Determination of subnanomolar concentrations of cobalt by adsorptive stripping voltammetry at a bismuth film electrode.
abstract: Procedures for trace cobalt determinations by adsorptive stripping voltammetry at in situ and ex situ plated bismuth film electrodes are presented. These exploit the enhancement of the cobalt peak obtained by using the Co(II)-dimethylglyoxime-cetyltrimethylammonium bromide-piperazine-N,N'-bis(2-ethanesulfonic acid) system. The calibration graph for an accumulation time of 120 s was linear from 2 x 10(-10) to 2 x 10(-8) mol L(-1). The relative standard deviation from five determinations of cobalt at a concentration of 5 x 10(-9) mol L(-1) was 5.2%. The detection limit for an accumulation time of 300 s was 1.8 x 10(-11) mol L(-1). The proposed procedure was applied to cobalt determination in certified reference materials and in tap and river water samples.
authors: Faculty of Chemistry, Maria Curie Sklodowska University, 20-031, Lublin, Poland. mkorolcz@hermes.umcs.lublin.pl
authors: Mieczyslaw
authors: M
authors: Korolczuk
authors: Aleksandra
authors: A
authors: Moroziewicz
authors: Malgorzata
authors: M
authors: Grabarczyk
mesh_terms: D000327:Adsorption; D001729:Bismuth / Q000737:chemistry*; D002138:Calibration; D003035:Cobalt / Q000032:analysis*; D004563:Electrochemistry; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D005618:Fresh Water / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004573:Electrolytes; D014874:Water Pollutants, Chemical; D003035:Cobalt; D001729:Bismuth