Solid-Contact Perchlorate Sensor with Nanomolar Detection Limit Based on Cobalt Phthalocyanine Ionophores Covalently Attached to PolyacrylamideReport as inadecuate




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Novel solid-contact perchlorate sensors based on cobalt phthalocyanine-C-monocarboxylic acid I, and cobalt phthalocyanine-C,C,C,C-tetracarboxylic acid II as free ionophores and covalently attached to polyacryla- mide PAA—ionophores III and IV, respectively were prepared. The all solid-state sensors were constructed by the application of a thin film of a polymer cocktail containing a phthalocyanine ionophore and cetyltrimethylammonium bromide CTMAB as a lipophilic cationic additive onto a gold electrode precoated with the conducting polymer poly 3,4-ethylenedioxythiophene PEDOT as an ion and electron transducer. The sensor with 10.3% of ionophore III covalently attached to plasticizer-free poly butyl methacrylate-co-do- decyl methacrylate PBDA exhibited a good selectivity for perchlorate and discriminated many ions, in- cluding F–, Cl–, Br–, I–, SCN–, , S2– and . The covalent attachment of the ionophore to the polymer resulted in a near-Nernstian anionic slope of –62.3 mV-decade whereas a super-Nernstian slope of –79.9 mV- decade was obtained for the free ionophore. The sensor covered a linear concentration range of 5 × 10–9 - 1 × 10–2 mol?L–1 with a lower detection limit LDL of 1 × 10–9 mol?L–1 and gave a stable response over a pH range of 4 - 10.5. The all-solid state sensors were utilized for the selective flow injection potentiometric determination of perchlorate in natural water and human urine samples in the nanomolar concentration range.

KEYWORDS

Ion-Selective Electrode, Solid Contact, Covalent Ionophore Attachment, Perchlorate, Flow-Injection Analysis, Urine

Cite this paper

M. Abbas, A. Radwan, P. Bühlmann and M. Ghaffar -Solid-Contact Perchlorate Sensor with Nanomolar Detection Limit Based on Cobalt Phthalocyanine Ionophores Covalently Attached to Polyacrylamide,- American Journal of Analytical Chemistry, Vol. 2 No. 7, 2011, pp. 820-831. doi: 10.4236-ajac.2011.27094.





Author: Mohammad Nooredeen Abbas, Abdel Lattief A. Radwan, Philippe Bühlmann, Mahmud A. Abd El Ghaffar

Source: http://www.scirp.org/



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