Selective phosphate sensing using copper monoamino-phthalocyanine functionalized acrylate polymer-based solid-state electrode for FIA of environmental waters

• Published in: Journal of solid state electrochemistry Vol. 20; no. 6; pp. 1599 - 1612
• Main Authors: Abbas, Mohammad Nooredeen, Radwan, Abdel Latief A., Nooredeen, Naglaa M., El-Ghaffar, Mahmoud A. Abd
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2016
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemistry; Energy Storage; Original Paper; Physical Chemistry; Solid contact sensor; Environmental water; Mono-hydrogen phosphate; Copper monoamino-phthalocyanine; Flow injection
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-016-3165-z

A novel solid-state selective sensor for mono-hydrogen phosphate (HPO 4 ) −2 based on copper monoamino phthalocyanine (CuMAPc) ionophore covalently attached to poly (n-butyl acrylate) (PnBA) has been developed and potentiometrically evaluated. The all solid-state sensor was constructed by the application of a thin film of a polymer cocktail containing a CuMAPc–PBDA ionophore and benzyl-dimethylhexadecyl ammonium chloride (BDMHAC) as a lipophilic cationic additive onto a gold electrode pre-coated with the conducting polymer poly (3,4-ethylenedioxythiophene) (PEDOT) as an ion and electron transducer. The sensor with 14.31 % of CuMAPc-PnBA (ionophore II) exhibited a good selectivity for (HPO 4 ) −2 . The thus constructed sensor discriminated many anions, including F − , Cl − , Br − , I – , CH 3 COO − , NO 3 − , ClO 4 − , and SO 4 2− . The potentiometric response of the phosphate selective electrode was found to be independent of the pH of sample solution in the range 6–9. The sensor showed a Nernstian slope of −29.8 ± 0.3 mV conc. −1  decade −1 with linear range of 4.0 × 10 −9 –1.0 × 10 −2  mol L −1 and detection limit of 1.0 × 10 −9  mol L −1 at pH 8.0. The proposed phosphate sensor has been utilized as a detector for the flow injection potentiometric determination of phosphate in different water samples at the nanomolar concentration range.