Simultaneous determination of trace levels of Cd(II) and Pb(II) in tap water samples by anodic stripping voltammetry with 2-mercaptobenzothiazole modified electrode

Abstract

<span lang="EN-US">Glassy carbon electrode (GCE) modified by 2-mercaptobenzothiazole (MBT), mesoporous silica (Meso) and bismuth was developed to determine Cd(II) and Pb(II) simultaneously by square wave anodic stripping voltammetry (SWASV). In-situ preparation was found to work best in optimum conditions of acetate buffer pH 6, accumulation potential of <br /> -1.1 V, deposition time of 300 s and scan rate of 200 mV/s. SW peaks revealed the linear range of 5-50 µg/L Cd(II) and 5-50 µg/L Pb(II). LOD and LOQ for Cd(II) and Pb(II) were determined as 0.56, 0.80, 1.87 and 2.66 µg/L, respectively. The interaction of metals with bismuth and MBT, as well as higher surface area due to mesoporous silica, support beneficial performance of the modified electrode. Insignificant interferences from other regularly present metal ions were found. With SRM1640 standard, the SWASV results are found comparable to those obtained by inductive coupled plasma optical emission spectrometry (ICP-OES). The method was used to analyze the metals in tap water by standard addition method with the satisfactory recovery of 100.7 % for Cd(II) and 100.8 % for Pb(II).</span>

Voltammetry for Onsite Simultaneous Metal Analysis

“…In our case, we have shown that Bi/chitosan/mesoporous silica can be used in the determination of Cd (II) and Pb (II) in water lily in polluted water resources [9]. Our work might also prove that certain compounds can be used in-situ for simultaneous ASV analysis of various metals in addition to Cd (II) and Pb (II) [10]. However, the fact that Boron doped diamond (BDD) works well with Pb (II) [11] might turn out that BDD alone can be applied here for simultaneous analysis which would make it easier for onsite applications.…”

A sensitive sensor based on graphitic carbon nitride/1-butyl-3-methylimidazolium hexafluorophosphate ionic liquids modified carbon paste electrode for sensing of carmoisine dye in food samples

“…Electrochemical sensors showed many advantages for the analysis of food compounds due to their fast response. High oxidation/reduction over-potential and low sensitivity of electroactive compounds at the surface of unmodified electrodes are major problems for trace level analysis [13][14][15][16][17][18][19][20]. Therefore, modified electrodes were suggested as highly powerful tools for trace-level analysis of electroactive compounds.…”