Adsorptive stripping voltammetric determination of vanadium(V) witch chloranilic acid using cyclic renewable mercury film silver based electrode

The cyclic renewable mercury film silver based electrode (Hg(Ag)FE), applied for the determination of vanadium(V) traces using differential pulse adsorptive cathodic stripping voltammetry (DP AdCSV) with presence of chloranilic acid as a ligand is presented. The calibration graph obtained for V(V) is linear from 0.25 nM (12.7 ng L-1) to 150 nM (7.6 mu g L-1) for a preconcentration time of 20 s, with correlation coefficient of 0.9992. For a Hg(Ag)FE with a surface area of 6.6 mm(2) the detection limit for a preconcentration time of 90 s is as low as 0.5 ng L-1. The repeatability of the method at a concentration level of the analyte as low as 1.3 mu g L-1, expressed as RSD is 2.1% (n = 5). The proposed method was successfully applied and validated by studying the certified reference materials TMRAIN-95, SPS-SW1, SPS-SW2 and simultaneously recovery of V(V) from spiked water samples. (C) 2009 Elsevier B.V. All rights reserved.