Carbon paste electrodes modified with Bi(2)O(3) as sensors for the determination of Cd and Pb.
Carbon paste electrodes bulk-modified with Bi(2)O(3)were used for the determination of Cd(II) and Pb(II). The best composition was 1% (wt%) Bi(2)O(3) in the paste. The measurements were made by differential pulse voltammetry in the potential range from -1.2 V to -0.3 V. The peak potential of the reoxidation of Cd is -0.85 V, and of Pb -0.60 V vs. SCE. The lowest concentration that could be determined was 5 microg L(-1) of both metals (preconcentration time 240 s), the relative standard deviation was 3.5%-5.0% (four determinations). The correlation coefficient ( r(2)) of the calibration curves was 0.9966 (for Cd) and 0.9971 (for Pb). The Bi(2)O(3)-modified electrode could be used for the analysis of drinking water, mineral water and urine.
Pauliukaite
Rasa
R
Institute of Chemistry, Department of Kinetics and Catalysis, 2600 Vilnius, Lithuania.
Metelka
Radovan
R
Svancara
Ivan
I
Królicka
Agnieszka
A
Bobrowski
Andrzej
A
Vytras
Karel
K
Norkus
Eugenijus
E
Kalcher
Kurt
K