Polymethacrylate optodes: A potential for chemical digital color analysis |
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| Affiliation: | 1. LNE, 29 avenue Roger Hennequin, 78197 Trappes, France;2. TOTAL, 2 place Jean Millier – La Défense 6, 92078 Paris La Défense, France;3. TENESOL, 12 allée du Levant, 69890 La Tour-de-Salvagny, France;1. Universidade de Évora, Centro de Geofísica de Évora, Instituto de Telecomunicações, Évora, Portugal;2. Universidade de Évora, Centro de Geofísica de Évora, Évora, Portugal;3. Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, Darmstadt, Germany;4. Instituto Superior Técnico, Universidade de Lisboa, Instituto de Telecomunicações, Lisboa, Portugal;1. Institute of Process Measurement and Sensor Technology, Ilmenau University of Technology, 98693 Ilmenau, Germany;2. Sartorius Weighing Technology GmbH, Göttingen, Germany;1. Department of Engineering Mechanics, Kaunas University of Technology, K. Donelaicio 73, LT-44244 Kaunas, Lithuania;2. Department of Engineering Mechanics, Kaunas University of Technology, A. Mickeviciaus 37, LT-44244 Kaunas, Lithuania;3. Department of System Analysis, Kaunas University of Technology Studentu 50-407, LT-51368 Kaunas, Lithuania;4. Department of Machine Engineering, Vilnius Gediminas Technical University, J. Basanaviciaus g. 28, LT-03224 Vilnius, Lithuania;5. Precizika-Metrology, Zirmunu g. 139, LT-09120 Vilnius, Lithuania |
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| Abstract: | The paper describes results of implementing a new kind of optical analytical method, digital color analysis (DCA), in which colorimetric polymethacrylate sensors (optodes) are used. The optodes are made of optically transparent polymethacrylate matrix with physically immobilized analytical reagent which is responsible for the extraction of the analyte into the sensing material and changing its color. The developed optodes can be used in determination of various analytes using both solid-phase spectrophotometer and naked eye. In order to improve accuracy and sensitivity of the naked-eye determination, it is possible to measure visible color changes using digital imaging of the polymethacrylate optode. The digital images then can be represented as basic color (e.g. RGB) data. The DCA determinations of Cu (II), Ag (I) and Co (II) have indicated that the developed optodes are linear in concentration ranges 0.02–0.30; 0.02–0.20 and 0.05–0.25 mg L?1 appropriately with corresponding practical detection limits of 0.01; 0.02 and 0.07 mg L?1. |
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| Keywords: | Analytical method Colorimetric sensor Transparent polymeric matrix Immobilized reagents Digital color analysis |
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