Anodic stripping voltammetric determination of Hg(II) using poly xylenol orange film modified electrode

Abstract

A sensitive determination of Hg(II) in different water samples has been carried out using stripping voltammetric technique based on poly xylenol orange film modified electrode. The modified poly xylenol orange (PXO) film was fabricated on the paraffin-impregnated graphite electrode (PIGE) using electro polymerization method by applying the potential between − 0.4 V to 0.8 V at a scan rate of 50 mV/s for 30 segments in 0.1 M phosphate buffer solution (pH 7.0) containing 5 × 10−4 M of xylenol orange. The PXO film modified electrode was characterized by DRS-UV, SEM, and differential pulse voltammetry techniques. The xylenol orange film electrode was used to preconcentrate Hg(II) ions through complexation; the complexed metal ions were then reduced electrochemically followed by stripping anodically from the surface of the modified electrode. The obtained linear concentration range for Hg(II) was from 0.13 to 20.5 μg/L with a limit of detection is 0.043 μg/L.