Simultaneous determination of copper, lead, and cadmium at hexagonal mesoporous silica immobilized quercetin modified carbon paste electrode.
A new method was developed for simultaneous determination of copper, lead, and cadmium, based on their voltammetric response at a carbon paste electrode modified with hexagonal mesoporous silica (HMS) immobilized quercetin (HMS-Qu/CPE). Compared with quercetin modified carbon paste electrode (Qu/CPE) and quercetin ionic liquid modified carbon paste electrode (Qu-IL/CPE), the HMS-Qu/CPE exhibited improved selectivity and high sensitivity toward the detection of copper, lead, and cadmium. The properties of the HMS-Qu/CPE in 0.1 M HCOONa-HCl buffer solution (pH 4.7) were investigated by adsorptive stripping voltammetry (ASV) and electrochemical impedance spectroscopy (EIS). The electrochemical behavior of copper, lead, and cadmium at the modified electrodes and factors affecting the preconcentration procedures were also investigated. Detection limits of 5.0, 0.8, 1.0 nM for copper, lead, and cadmium were obtained, respectively. The method is simple, fast, sensitive, and selective, and is successfully applied to soil sample.
Xia
Fangquan
F
School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022 Shandong, China. chm_xiafq@ujn.edu.cn
Zhang
Xin
X
Zhou
Changli
C
Sun
Danzi
D
Dong
Yanmin
Y
Liu
Zhen
Z
Nat Mater. 2007 Aug;6(8):602-8
17589513
Biosens Bioelectron. 2007 Aug 30;23(1):35-41
17459687
Biosens Bioelectron. 2007 Dec 15;23(5):695-700
17875390
Chem Rev. 2007 Jul;107(7):2821-60
17580976
Talanta. 2005 Dec 15;68(2):256-61
18970314
J Nanosci Nanotechnol. 2005 Sep;5(9):1537-40
16193970
Science. 1995 Feb 10;267(5199):865-7
17813916
Anal Chem. 2004 Aug 1;76(15):4583-8
15283606
Analyst. 2003 May;128(5):467-72
12790199
Chemphyschem. 2004 Aug 20;5(8):1106-20
15446732