Simultaneous determination of Pb(ii) and Cd(ii) using an electrode modified with electropolymerized thiadiazole film

Abstract

The present study reports a sensitive electro-analytical method for the simultaneous determination of trace lead (Pb(II)) and cadmium (Cd(II)) using a non-mercury electrode modified with the electropolymerized thiadiazole film. The electropolymerization of 2,5-dimercapto-1,3,4-thiadiazole on a glassy carbon electrode is carried out, and differential pulse anodic stripping voltammetry for the simultaneous determination of trace Pb(II) and Cd(II) is developed by using this modified electrode as the working electrode. In 0.1 mol L À1 acetate buffer solution at pH 5.5, the stripping peak currents after enrichment at À1.20 V for 300 s showed good linear relationships with Pb(II) and Cd(II) at concentration ranges of 1.00-200 and 0.50-200 mg L À1 , and the detection limits are 0.30 and 0.05 mg L À1 , respectively. The proposed method is applicable to the simultaneous determination of trace Pb(II) and Cd(II) in real water samples with the relative standard deviations of less than 5.7% and the recovery rates of 97.6-106%. The good response of the prepared electrode to Pb(II) and Cd(II) is attributed to the binding of thiol groups and the electrostatic interaction between the modified electrode with metal ions. The findings indicate that the proposed method is helpful in monitoring toxic elements in environmental waters.

Electrocatalytic Oxidation and Determination of Morin at a Poly(2,5-dimercapto-1,3,4-thiadiazole) Modified Carbon Fiber Paper Electrode

“…The film was unstable when the potential was scanned from −0.40 V owing to the cleavage of S-S bond (reduction peak appeared at −0.28 V). 48 However, it was stable in the potential window of −0.10 to +1.20 V, indicating the electropolymerization of DMTD is an irreversible process in the specified range (Fig. 1).…”

Potentiostatic Electrochemical Preparation of Bismuth Nanoribbons and its Application in Biologically Poisoning Lead and Cadmium Heavy Metal Ions Detection

“…In order to get maximum sensitivity for the detection of Pb(II) and Cd(II), the effect of accumulation potential and time were optimized as −1.2 V and 200 s respectively. Beyond these potential and time, the affective sites on the BiNRs/SPCE electrode surface reached saturation 16.…”

Fabrication and Application of a New Modified Electrochemical Sensor Using Newly Synthesized Calixarene-Grafted Mwcnts for Simultaneous Determination of Cu(II) and Pb(II)

“…In recent years, attention has been paid by scientists to the heavy metal ion discharge into the environment because of their highly toxic effects for the living organisms even at trace concentrations. 1,2 Exposure to the lead, which is known as one of the most toxic elements, may result in bioaccumulation processes in the hematopoietic, hepatic, renal, and gastrointestinal systems of humans; therefore, it can cause serious toxic effects on human health. 3 Anthropogenic activities are the main source of lead along with industrial emissions.…”