A Highly Selective Potentiometric Sensor of Molybdate Based on a μ-Oxo-bridged Manganeseporphyrin Dimer

FANG Zheng-Hui, HAN Zhi-Xiang, ZHANG Xiao-Bing, SHEN Guo-Li, YU Ru-Qin

doi:10.2116/analsci.22.949

A Highly Selective Potentiometric Sensor of Molybdate Based on a μ-Oxo-bridged Manganeseporphyrin Dimer

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FANG Zheng-Hui

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University Yueyang Vocational & Technical College
HAN Zhi-Xiang

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University
ZHANG Xiao-Bing

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University
SHEN Guo-Li

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University
YU Ru-Qin

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University

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A Highly Selective Potentiometric Sensor of Molybdate Based on a .MU.-Oxo-bridged Manganeseporphyrin Dimer
Highly Selective Potentiometric Sensor of Molybdate Based on a ミュー Oxo bridged Manganeseporphyrin Dimer
A Highly Selective Potentiometric Sensor of Molybdate Based on a m-Oxo-bridged Manganeseporphyrin Dimer

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A novel high-selective potentiometric sensor for molybdate was prepared with a PVC membrane combining μ-oxo-bis[5,10,15,20-tetra(p-methylphenyl)porphinatomanganese(III)] [[Mn(p-Me)TPP]₂O] as an electroactive material and 2-nitrophenyl octyl ether (o-NPOE) as a plasticizer in the percentage ratio of 3:65:32, [Mn(p-Me)TPP]₂O:o-NPOE:PVC (w:w). The sensor exhibited a linear response with a Nernstian slope of 30.5 mV per decade within a concentration range of 2.1 × 10^-6 to 1.0 × 10^-1 M MoO₄^2-, with a working pH range from 5.0 to 12.5, and a fast response time of less than 15 s. The electrode showed improved selectivity toward molybdate with respect to common coexisting anions compared to monometalloporphyrin counterparts. Several electroactive materials and solvent mediators were compared and the experimental conditions were optimized. The sensor is preliminary applied to the assay of MoO₄^2- in corrosion inhibitor samples with satisfactory results.