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Updated: Jun 28, 2026

Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
Published on: May 26, 2019
Catalytic adsorptive stripping determination of trace chromium (VI) at the bismuth film electrode
Lin Lin1, Nathan S Lawrence, Sompong Thongngamdee
1Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA.
Abstract:
A sensitive adsorptive stripping voltammetric protocol at a bismuth-coated glassy-carbon electrode for trace measurements of chromium (VI) in the presence of diethylenetriammine pentaacetic acid (DTPA) is described. The new protocol is based on accumulation of the Cr-DTPA complex at a preplated bismuth film electrode held at -0.80V, followed by a negatively-going square-wave voltammetric waveform. Factors influencing the stripping performance including the film preparation, solution pH, DTPA and nitrate concentrations, deposition potential and deposition time, have been optimized. The resulting performance compares well with that observed for analogous measurements at mercury film electrodes. A preconcentration time of 7min results in a detection limit of 0.3nM Cr(VI) and after 2min a relative standard deviation at 20nM of 5.1% (n = 25). Applicability to river water samples is demonstrated. The attractive behavior of the new "mercury-free" chromium sensor holds great promise for on-site environmental and industrial monitoring of chromium (VI). Preliminary data in this direction using bismuth-coated screen-printed electrodes are encouraging.
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