Sensitive Voltammetric Determination of Titanium(IV) in Catalytic Adsorptive Mandelic Acid-Chlorate(V) System on Renewable Silver Amalgam Film Electrode

The renewable mercury film electrode, applied for the determination of titanium(IV) ultratraces using differential pulse catalytic adsorptive cathodic stripping voltammetry (DP CAdSV) in the presence of mandelic acid as a ligand and chlorate(V) as an oxidant is represented. The calibration graph obtained for Ti(IV) is linear from 0.05nM (2.39ngL1) to 95nM (4.55 mu gL1) for a preconcentration time of 30s, with correlation coefficient of 0.9995. For the renewable mercury electrode (Hg(Ag)FE) with a surface area of 8.6mm2 the detection limit for a preconcentration time of 180s is as low as 0.006nM (0.29ngL1). The repeatability of the method at a concentration level of the analyte as low as 23.9ngL1, expressed as RSD is 1.8% (n=5). The proposed method was successfully applied and validated by studying the certified reference material NWTM-26.3 and simultaneously recovery of Ti(IV) from spiked samples.