Enhancing selectivity in stripping voltammetry by different adsorption behaviors: the use of nanostructured Mg-Al-layered double hydroxides to detect Cd(II).
We report the use of nanostructured layered double hydroxides (LDHs) for the highly selective and sensitive detection of Cd(2+) using anodic stripping voltammetry (ASV). In particular, the modification of a glassy carbon electrode promotes the sensitivity and selectivity towards Cd(2+) in the presence of Pb(2+), Hg(2+), Cu(2+) and Zn(2+). The electrochemical characterization and anodic stripping voltammetric performance of Cd(2+) were evaluated using cyclic voltammetry (CV) and square wave anodic stripping voltammetry (SWASV) analysis. Operational parameters, including supporting electrolytes, pH value, deposition potential and deposition time were optimized. In addition, the selectivity, interference and stability were also investigated under the optimized conditions. The results showed that the fabricated electrode possessed good selectivity, stability and reproducibility. The proposed electrochemical sensing strategy is thus expected to open new opportunities to broaden the use of ASV in analysis for detecting heavy metal ions in the environment.
Department of Chemistry, University of Science and Technology of China, Hefei, 230026, PR China.
Ren-Xia
RX
Xu
Xin-Yao
XY
Yu
Chao
C
Gao
Jin-Huai
JH
Liu
Richard G
RG
Compton
Xing-Jiu
XJ
Huang
D000536:Aluminum Hydroxide / Q000737:chemistry*; D002104:Cadmium / Q000032:analysis*; D002413:Cations, Divalent / Q000032:analysis; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D008276:Magnesium Hydroxide / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D012680:Sensitivity and Specificity; D014867:Water / Q000032:analysis
D002413:Cations, Divalent; D002104:Cadmium; D014867:Water; D000536:Aluminum Hydroxide; D008276:Magnesium Hydroxide