Photoelectrochemical determination of inorganic mercury in aqueous solutions |
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Authors: | Jessica Chamier Joy Leaner |
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Institution: | a Department of Chemistry and Polymer Science, University of Stellenbosch, Matieland X1, Stellenbosch 7602, South Africa b Council for Scientific and Industrial Research, Natural Resources and the Environment, P.O. Box 320, Stellenbosch 7599, South Africa c Department of Environmental Affairs and Development Planning, Private bag x 9086, Cape Town 8001, South Africa d Institute of Molecular Sciences, Faculty of Science, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa |
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Abstract: | An analytical method using an optical probe in a photoelectrochemical cell for the sensitive and selective determination of aqueous Hg2+ is presented. A previously synthesized Hg2+ selective chemosensor, proven to be Hg2+ sensitive up to 2 μg L−1, has been immobilized onto indium tin oxide (ITO) electrodes in a composite form with polyaniline. The coated ITO electrode was placed in a photoelectrochemical cell under closed circuit conditions in which the optical recognition of the chemosensor was converted to a measurable signal. A composite of the fluorescent chemosensor, Rhodamine 6G derivative (RS), and polyaniline (PANI) was immobilized on ITO glass plates and subjected to photovoltage measurements in the absence and presence of Hg2+. The optical responses of the coated electrode were used to determine the sensitivity and selectivity of the immobilized sensor to Hg2+ in the presence of background ions. The optical response of the PANI-dye coated electrode increased linearly with increasing Hg2+ concentration in the range 10-150 μg L−1, with a detection limit of 6 μg L−1. |
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Keywords: | Photoelectrochemical detection Inorganic mercury Chemosensor Polyaniline Rhodamine 6G |
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