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Sensors 2012, 12(6), 8193-8203; doi:10.3390/s120608193

A Novel Sensor for Monitoring of Iron(III) Ions Based on Porphyrins

2,* , 3
1 and 4
1 Faculty of Chemistry-Biology-Geography, West University of Timisoara, Pestalozzi Street 16, 300115-Timisoara, Romania 2 Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave. 24, 300223-Timisoara, Romania 3 National Institute of Research for Electrochemistry and Condensed Matter, Timisoara, Aurel Paunescu Podeanu Street 144, 300860-Timisoara, Romania 4 Instituto Tecnológico de la Energía (ITE), Avenida Juan de la Cierva 24, 46980 Paterna, Valencia, Spain
* Author to whom correspondence should be addressed.
Received: 9 April 2012 / Revised: 27 May 2012 / Accepted: 8 June 2012 / Published: 13 June 2012
(This article belongs to the Section Chemical Sensors)
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Three A3B porphyrins with mixed carboxy-, phenoxy-, pyridyl- and dimethoxy-substituent functionalization on the meso-phenyl groups were obtained by multicomponent synthesis, fully characterized and used as ionophores for preparing PVC-based membrane sensors selective to iron(III). The membranes have an ionophore:PVC:plasticizer composition ratio of 1:33:66. Sodium tetraphenylborate was used as additive (20 mol% relative to ionophore). The performance characteristics (linear concentration range, slope and selectivity) of the sensors were investigated. The best results were obtained for the membrane based on 5-(4-carboxyphenyl)-10,15,20-tris(4-phenoxyphenyl)-porphyrin plasticized with bis(2-ethylhexyl)sebacate, in a linear range from 1 × 10−7–1 × 10−1 M with a slope of 21.6 mV/decade. The electrode showed high selectivity with respect to alkaline and heavy metal ions and a response time of 20 s. The influence of pH on the sensor response was studied. The sensor was used for a period of six weeks and the utility has been tested for the quantitative determination of Fe(III) in recovered solutions from spent lithium ion batteries and for the quantitative determination of Fe(III) in tap water samples.
Keywords: porphyrins; ion-selective electrode; potentiometry; lithium ion batteries; iron(III); PVC membrane porphyrins; ion-selective electrode; potentiometry; lithium ion batteries; iron(III); PVC membrane
This is an open access article distributed under the Creative Commons Attribution License (CC BY) 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.; Popa, I.; Chiriac, V.; Gil-Agusti, M. A Novel Sensor for Monitoring of Iron(III) Ions Based on Porphyrins. Sensors 2012, 12, 8193-8203.

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