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Free Base Porphyrins as Ionophores for Heavy Metal Sensors
West University of Timisoara, 4 V. Parvan Ave, Timisoara 300223 Timis, Romania
Institute of Chemistry –Timişoara of Romanian Academy, 24 M. Viteazul Ave, 300223-Timisoara, Romania
Technical University of Cluj-Napoca, Faculty of Science and Materials Engineering, 15 Constantin Daicoviciu Street, 400020 Cluj-Napoca, Romania
Nationale Institute of Research and Development for Isotopic and Molecular Technologies, 71-103 Donath Street 400293, Cluj-Napoca, Romania
* Author to whom correspondence should be addressed.
Received: 25 July 2008; in revised form: 13 August 2008 / Accepted: 21 August 2008 / Published: 25 August 2008
Abstract: Two functionalized porphyrins: 5,10,15,20-tetrakis(3,4-dimethoxyphenyl) porphyrin (A) and 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrin (B) obtained and characterized by us were used as ionophores (I) for preparing PVC-based membrane sensors selective to Ag+, Pb2+ and Cu2+. The membranes were prepared using three different plasticizers: (bis(2-ethylhexyl)sebacate (DOS), dioctylphtalate (DOP), o-nitrophenyl octyl ether (NPOE) and potassium tetrakis(4-chlorophenyl)borate (KTClPB) as additive. The functional parameters (linear concentration range, slope and selectivity) of the sensors with membrane composition: (I:PVC:KTClPB:Plasticizer) in different ratios were investigated. The best results were obtained for the membranes in the ratio I:PVC:KTClPB:Plasticizer 10:165:5:330. The influence of pH on the sensors response was studied. The sensors were used for a period of four months and their utility has been tested on synthetic and real samples.
Keywords: Porphyrins; ionophores; sensors; heavy metals; PVC-matrix.
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Vlascici, D.; Fagadar-Cosma, E.; Pica, E.M.; Cosma, V.; Bizerea, O.; Mihailescu, G.; Olenic, L. Free Base Porphyrins as Ionophores for Heavy Metal Sensors. Sensors 2008, 8, 4995-5004.
Vlascici D, Fagadar-Cosma E, Pica EM, Cosma V, Bizerea O, Mihailescu G, Olenic L. Free Base Porphyrins as Ionophores for Heavy Metal Sensors. Sensors. 2008; 8(8):4995-5004.
Vlascici, Dana; Fagadar-Cosma, Eugenia; Pica, Elena M.; Cosma, Viorica; Bizerea, Otilia; Mihailescu, Gheorghe; Olenic, Liliana. 2008. "Free Base Porphyrins as Ionophores for Heavy Metal Sensors." Sensors 8, no. 8: 4995-5004.