Adsorptive stripping voltammetric determination of cobalt in the presence of dimethylglyoxime and cetyltrimethylammonium bromide.
A sensitive procedure for determination of micro-traces of Co(II) by adsorptive stripping voltammetry is proposed. The procedure exploits the enhancement of the cobalt peak obtained by use of the system Co(II)-dimethylglyoxime-piperazine-1,4-bis(2-ethanesulfonic acid)-cetyltrimethylammonium bromide. Using the optimized conditions, a detection limit (based on the 3 sigma criterion) for Co(II) of 1.2 x 10(-11) mol L(-1) (0.7 ng L(-1)) was achieved. The calibration plot for an accumulation time of 30 s was linear from 5 x 10(-11) to 4 x 10(-9) mol L(-1). The procedure was validated by analysis of certified reference materials and natural water samples.
Korolczuk
Mieczyslaw
M
Faculty of Chemistry, Maria Curie-Sklodowska University, 20-031 Lublin, Poland. mkorolcz@hermes.umcs.lublin.pl
Moroziewicz
Aleksandra
A
Grabarczyk
Malgorzata
M
Kutyła
Romualda
R
D000327:Adsorption; D002138:Calibration; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D003035:Cobalt / Q000032:analysis*; D004563:Electrochemistry; D004572:Electrolysis; D004784:Environmental Monitoring / Q000379:methods; D006863:Hydrogen-Ion Concentration; D010091:Oximes / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013997:Time Factors; D014873:Water Pollutants / Q000032:analysis*
D002593:Cetrimonium Compounds; D010091:Oximes; D014873:Water Pollutants; C013501:dimethylglyoxime; D003035:Cobalt; D000077286:Cetrimonium