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• Vlascici, D
• Fagadar-Cosma, E
• Pica, EMaria
• Cosma, V
• Bizerea, O
• Mihailescu, G
• Olenic, L
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• Bizerea, O
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Sensors 2008, 8(8), 4995-5004; doi:10.3390/s8084995

Article

Free Base Porphyrins as Ionophores for Heavy Metal Sensors

Dana Vlascici^1,* , Eugenia Fagadar-Cosma² , Elena Maria Pica³ , Viorica Cosma³ , Otilia Bizerea¹ , Gheorghe Mihailescu⁴  and Liliana Olenic⁴

¹ West University of Timisoara, 4 V. Parvan Ave, Timisoara 300223 Timis, Romania ² Institute of Chemistry –Timişoara of Romanian Academy, 24 M. Viteazul Ave, 300223-Timisoara, Romania ³ Technical University of Cluj-Napoca, Faculty of Science and Materials Engineering, 15 Constantin Daicoviciu Street, 400020 Cluj-Napoca, Romania ⁴ 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

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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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