Abstract
Mesostructured silica nanoparticles functionalized with a 5-mercapto-1-methyltetrazole derivative (MTTZ-MSU-2) were employed to prepare a chemically modified carbon paste electrode for Hg(II) determination in aqueous media by square wave adsorptive anodic stripping voltammetry. Under optimized operating conditions, 60s of electrolysis time in HCl 0.1M, the voltammetric signal increased with increasing preconcentration time from 1 to 10min. The voltammetric responses measured (peak areas) were linear with respect to Hg(II) concentration in the range of 0.1–1μM with a detection limit of 0.099μM after 5min preconcentration time and in the range of 0.025–0.25μM with a detection limit of 0.023μM for 10min of preconcentration time. The chemically modified carbon paste electrode had good single and inter-electrode reproducibility (RSD of 2 and 12%, respectively). Applicability to spiked groundwater and river water was demonstrated without any sample pretreatment (recoveries of 99 and 92%, RSD 4–7%, respectively).
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