Nghiên cứu xác định vết chì (Pb), indi (In) và cadimi (Cd) bằng phương pháp von-ampe hòa tan anot sử dụng điện cực paste ống nanocacbon biến tính bằng Bi2O3

Abstract

This paper reports the use of Bi₂O₃-modified carbon nanotubes paste electrode (Bi₂O₃-CNTPE) for trace lead (Pb), cadmium (Cd) and indium (In) determination by differential pulse anodic stripping voltammetry (DP-ASV). The stripping peak current (I_p)has a linear relationship with concentration in the range of Pb(II), In(III) and Cd(II) are 1.21×10^-8 M to 4.83×10^-8 M, 5.22×10^-8 M to 12.17×10^-8 M, 2.23×10^-8 M to 8.93×10^-8 M, respectively,  with a deposition time of 60 s at deposition potential of -1.2 V, in 0.1 M acetate buffer (pH = 4.5) and 0.1 M KBr. The 3σ detection limit (n = 10) of Pb, in and Cd is 0.83×10^-9 M, 6.47×10^-9 M, 1.38×10^-9 M, respectively. The electrode was applied to determination of Pb(II), In(III) and Cd(II) in water sample.

Keywords: Stripping Voltammetry, Bi₂O₃-CNTPE, lead, indium, cadmium.