Poster presented at the 50. Jahrestreffen Deutscher Katalytike

Etzold, Bastian JM

Shen, Liu-Liu

Zhang, Gui-Rong

English

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Liu-Liu Shen, Gui-Rong Zhang, Wei Li, Markus Biesalski, Bastian J.M. Etzold50. Jahrestreffen Deutscher Katalytiker, 15th – 17th Mar. 2017, Weimar, GermanyReferences:[1] P. Lodeiro, J. Barriada, R. Herrero, M.S. De Vicente, Environ. Pollut. 2006, 142, 264.[2] P. Apostoli, J. Chromatogr. B 2002, 778, 63.[3] Table of regulated drinking water contaminants. https://www.epa.gov/[4] Guidelines for drinking water quality, 4th ed. World Health Organization: Geneva, 2011.[5] L. Shen, G. Zhang, W. Li, M. Biesalsiki, B. J. M. Etzold, ACS Omega in submission.Device fabrication:Modifier-Free Microfluidic Electrochemical Sensor for Heavy Metal DetectionHeavy metals are hazard pollutants to the environment and impose severe risks to human health. Therefore, heavymetal detection is playing important role in environmental and clinical analysis. In this work, a simple, cost-effective and portable miniaturized electrochemical carbon-based sensor (µCS) is designed and proved to behighly sensitive towards Cd2+ and Pb2+ detection in aqueous solution. The µCS possess a novel 3D structure withworking and reference electrodes directly facing each other but separated by the microfluidic paper channel. Theelectrodes in µCS are inexpensive graphite foil without any additional surface modifier such as mercury orbismuth. It is found that impressive low detection limits of 1.2 µg/L for Cd2+ and 1.8 µg/L for Pb2+ can be achievedon the µCS. The µCS also exhibits stable sensing performance up to 10 repetitive measurements, demonstratingthe robustness of a sensing device for heavy metal detections. We believe that a proper design in the deviceconfiguration can completely eliminate the necessity to modify the working electrode by using additional surfacemodifier, which could provide new ideas for portable electroanalytical/sensing systems.Electrolyte:0.1	M	acetate	buffer,	pH=4.6Individual detection of Cd2+ and Pb2+§ Deposition condition:Cd2+: -1.2 V, 60 sPb2+: -1.1 V, 180 s§ The limit of detection(LOD) are below theallowable limits in drinkingwater proposed by USEnvironmental ProtectionAgency (Cd: 5 µg/L, Pb:15 µg/L) and WorldHealth Organization (Cd:3 µg/L, Pb: 10 µg/L).Stability and reproducibility of the µCS§ The deposition condition for simultaneous detection is (-1.2 V, 180 s).§ The detection limit is 6 µg/L for both Cd2+ and Pb2+.Conclusions:§ A modifier-free, low cost, reusable, electrochemical microfluidic carbon-based sensor was developed for heavy metal detection.§ High sensitivity and low detection limit at short detection time are obtained on the sensor during individual detection for Cd2+ and Pb2+.§ The high sensitivity may originate from the combined microfluidic configuration and novel 3D electrode layout, which may provide some new ideas forother portable electroanalytical/sensing systems.Structure analysis of the graphite foilSimultaneous detection of Cd2+ and Pb2+§ Very good electrocatalytic stability was observed on µCS.Prof. Bastian J.M. Etzold (etzold@tc1.tu-darmstadt.de)Ernst-Berl-Institut für Technische und Makromolekulare ChemieTechnische Universität Darmstadt64287 DarmstadtCorrespondence:This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement n° 681719)Electrochemical measurements1.	Metal	deposition;	2.	Square	wave	voltammetryExperimental SectionCd2+Pb2+LOD = 1.2 µg/LLOD = 1.8 µg/L§ The electrodeposited Cd species are selectively located at the edgepositions of graphite flakes.WE,	CE	&	RE:graphite	foilPaper	channel:filter	paper,	pore	size	15	µm

Modifier-Free Microfluidic Electrochemical Sensor for Heavy Metal Detection

https://zenodo.org/record/1065433/files/Poster_Weimar-2017.pdf

Modifier-Free Microfluidic Electrochemical Sensor for Heavy Metal Detection

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