Carbon paste electrodes modified with Bi(2)O(3) as sensors for the determination of Cd and Pb

Rasa Pauliukaite; Radovan Metelka; Ivan Svancara; Agnieszka Królicka; Andrzej Bobrowski; Karel Vytras; Eugenijus Norkus; Kurt Kalcher

doi:10.1007/s00216-002-1569-3

Carbon paste electrodes modified with Bi(2)O(3) as sensors for the determination of Cd and Pb

Anal Bioanal Chem. 2002 Nov;374(6):1155-8. doi: 10.1007/s00216-002-1569-3. Epub 2002 Oct 24.

Authors

Rasa Pauliukaite¹, Radovan Metelka, Ivan Svancara, Agnieszka Królicka, Andrzej Bobrowski, Karel Vytras, Eugenijus Norkus, Kurt Kalcher

Affiliation

¹ Institute of Chemistry, Department of Kinetics and Catalysis, 2600 Vilnius, Lithuania.

PMID: 12458435
DOI: 10.1007/s00216-002-1569-3

Abstract

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.