Catalytic Adsorptive Stripping Voltammetric Measurements of Trace Vanadium at Bismuth Film Electrodes
Bismuth-coated glassy-carbon electrodes have been successfully applied for catalytic adsorptive-stripping voltammetric measurements of low levels of vanadium(V) in the presence of chloranilic acid (CAA) and bromate ion. The new protocol is based on the accumulation of the vanadium-chloranilic acid complex from an acetate-buffer (pH 5.5) solution at a preplated bismuth film electrode held at -0.35 V (vs. Ag/AgCl), followed by a square-wave voltammetric scan. Factors influencing the adsorptive stripping performance, including the CAA and bromate concentrations, solution pH, and accumulation potential or time have been optimized. The response compares favorably with that observed at mercury film electrodes. A linear response is observed over the 5 - 25 ug/L concentration range (two min accumulation), along with a detection limit of 0.20 ug/L vanadium (10 min accumulation). High stability is indicated from the reproducible response of a 50 ug/L vanadium solution (n=25; RSD = 3.1%). Applicability to a groundwater sample is illustrated.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 887363
- Report Number(s):
- PNNL-SA-47950; 6899; KP1302000; TRN: US200621%%788
- Journal Information:
- Talanta, 69(4):914-917, Journal Name: Talanta, 69(4):914-917
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalytic Adsorptive Stripping Determination of Trace Chromium (VI) at Bismuth Film Electrodes
Nanostructured Electrochemical Sensors Based on Functionalized Nanoporous Silica for Voltammetric Analysis of Lead, Mercury and Copper