Determination of trace levels of Cd(II) in tap water samples by anodic stripping voltammetry with an electrografted boron-doped diamond electrode
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-01-01 |
| Journal | ScienceAsia |
| Authors | Chalermpol Innuphat, Pipat Chooto |
| Institutions | Prince of Songkla University |
| Citations | 13 |
Abstract
Section titled āAbstractāA boron-doped diamond electrode modified by 0.5 mM 4-aminomethyl benzoic acid was used for electrochemical determination of Cd 2+ in tap water samples by anodic stripping voltammetry.This method is based on the electrochemical reduction of 4-aminomethyl benzoic acid on the electrode followed by the determination of Cd 2+ with a single well-defined reduction peak at -0.72 V versus Ag/AgCl in acetate buffer solutions at pH 6.0.Optimal conditions were established with respect to electrode pretreatment, time accumulation, potential accumulation, scan rate, and pH.Accurate (r 2 = 0.9989, n = 6) calibration curves were obtained for Cd 2+ concentrations ranging between 2 ppb and 50 ppb.Other dissolved metals (Ca, Mg, Zn, Mn, Fe, Cu, Al, Co, Pb, and Ni) have no interference on the Cd 2+ calibration curves.The achieved detection limit was 0.2 ppb.High accuracy and reproducibility of the results as well as excellent stability of the electrode material proves superb capabilities of this Cd 2+ detection system.Recovery in the range of 97-102% further confirmed the usefulness of the proposed method to analyse Cd 2+ in tap water samples.The results with SRM1640 were in good agreement with those by inductively coupled plasma optical emission spectrometry.