Abstract
Hemin was physically adsorbed onto porous carbon felt (CF), a microelectrode ensemble of micro-carbon fiber (ca. 7 μm in diameter) and possessing a three-dimensional random structure. The hemin-CF exhibited a well-defined redox wave that is due to Fe(III)/Fe(II) redox process in hemin, with a formal potential of −0.32 V (vs. Ag/AgCl) in deoxygenated buffer solution of pH 7.0. The surface coverage of the electroactive hemin molecules on the surface of the CF was calculated to be 5.0 × 10−11 mol cm−2, and the apparent heterogeneous electron transfer rate constant is 3.35 s−1. The hemin-CF electrode displays excellent electrocatalytic activity for the reduction of dissolved oxygen (DO), and the magnitude of the cathodic current increases with increasing concentrations of DO in the sample solution. The electrode was used as a flow-through detector for sensitive and rapid consecutive determination of DO. Deoxygenated pH 7.0 solutions were analyzed at a flow rate of 8.0 mL min−1 at an applied potential of −0.2 V, and highly reproducible cathodic peak current responses to DO were observed in the 0.72 to 13.3 mg L−1 concentration range. The maximum throughput is 170 samples h−1. The hemin-CF-based amperometric flow-sensor was applied to determine the concentration of DO in environmental water samples.
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This research was financially supported in part by the NEXT-supported Program (2011–2015) for Strategic Research Foundation at Private Universities from the Ministry of Education, Science and Culture of Japan.
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Wang, Y., Hosono, T. & Hasebe, Y. Hemin-adsorbed carbon felt for sensitive and rapid flow-amperometric detection of dissolved oxygen. Microchim Acta 180, 1295–1302 (2013). https://doi.org/10.1007/s00604-013-1057-9
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DOI: https://doi.org/10.1007/s00604-013-1057-9