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Sensors 2008, 8(8), 4995-5004; doi:10.3390/s8084995
Article

Free Base Porphyrins as Ionophores for Heavy Metal Sensors

1,* , 2
,
3
,
3
,
1
,
4
 and
4
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 / Revised: 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. Porphyrins; ionophores; sensors; heavy metals; PVC-matrix.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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