Abstract
SummaryA new procedure is presented for the simultaneous determination of ultra trace amounts of vanadium and molybdenum based on adsorptive cathodic stripping voltammetry (AdCSV). Adsorptive accumulation of the V(V) and/or Mo(VI) with chromoxane cyanine R (CCR) onto a hanging mercury drop electrode, followed by reduction of the adsorbed species using differential pulse voltammetry method. Optimised conditions include a 60 s adsorption period at −0.10 V, 8.0 μm of CCR in 0.1 m acetate buffer, pH 3.6, and a voltammetric scan using differential pulse mode with 25 mV s−1 scan rate. Detection limits of 0.1 and 0.08 ng mL−1 were achieved for V(V) and Mo(VI), respectively, which can be lowered down to 0.06 and 0.04 ng mL−1 by extending the adsorption time to 180 s. The reduction currents are linear in the range of 0.3–24.0 ng mL−1 and 0.1–30.0 ng mL−1 for V(V) and Mo(VI), respectively. The relative standard deviation for ten replicates determination of 4.0 ng mL−1 V(V) and Mo(VI) were 1.8% and 1.1%, respectively. The proposed method applied for the determination of vanadium and molybdenum in river water, tap water, well water and plant foodstuff such as cucumber, tomato, carrot and tea.
Published Version
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