Free Base Porphyrins as Ionophores for Heavy Metal Sensors

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⁺, Pb and Cu . The membranes were prepared...

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Published inSensors (Basel, Switzerland) Vol. 8; no. 8; pp. 4995 - 5004
Main Authors Vlascici, Dana, Fagadar-Cosma, Eugenia, Pica, Elena Maria, Cosma, Viorica, Bizerea, Otilia, Mihailescu, Gheorghe, Olenic, Liliana
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 25.08.2008
Molecular Diversity Preservation International (MDPI)
Subjects
Copper
Electrodes
Heavy metals
ionophores
Membranes
Porphyrins
Potassium
PVC-matrix
Response time
Sensors
Silver
Romania
sensors
PVC-matrix
ionophores
heavy metals
Porphyrins
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Summary: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⁺, Pb and Cu . 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.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s8084995