Abstract
The development of a sensitive and selective electrochemical sensor for simultaneous quantification of manganese (Mn(II)) and chromium (Cr(VI)) using composite of graphene oxide (GO) and manganese oxide modified screen printed carbon electrode (GO-Mn2O3/SPCE) is reported for the first time. The good sensing performance is achieved by mixing GO prepared by modified Hummer’s method (GO-H) with proper particle size of Mn2O3 (241 nm). The mechanism of this sensor is based on the formation of Mn-O and Cr-O on the modified electrode with assistance of oxygen moieties provided by both Mn2O3 NPs and GO. The analytical performances were investigated by measuring electrochemical signal of Mn(II) and Cr(VI) by using square-wave cathodic stripping voltammetry (SWCSV). This sensor holds low electrode-to-electrode variation (relative standard deviation (RSD) < 4%) with a good limit of detection (LOD) at about 6.67 and 11.20 μg⋅L−1 for Mn(II) and Cr(VI), respectively. Applicability of this sensor was demonstrated by measuring Mn(II) and Cr(VI) in tap water samples with recovery of 90.77–103.45% and 82.34–103.73% for Mn(II) and Cr(VI) determinations, respectively. With the contribution of both GO and Mn2O3 as electrocatalysts, this developed sensor is capable to be used for water quality monitoring in real samples.
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Acknowledgements
We thank the Provincial Waterworks Authority, Sriracha Branch, Thailand, for providing tap water sample and venue for on-site detection.
Funding
This research was supported by the National Nanotechnology Center (NANOTEC, grant number P2150496 and P2051453) and National Science and Technology Development Agency (NSTDA), Thailand.
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Sangkaew, P., Ngamaroonchote, A. & Karn-orachai, K. Graphene oxide-manganese oxide composite as an electrocatalyst for simultaneous detection of manganese- and chromium-contaminated water. Microchim Acta 190, 386 (2023). https://doi.org/10.1007/s00604-023-05961-2
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DOI: https://doi.org/10.1007/s00604-023-05961-2