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Tetraazacyclohexadeca Macrocyclic Ligand as a Neutral Carrier in a Cr Ion-selective Electrode
Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee - 247 667, India
* Author to whom correspondence should be addressed.
Received: 15 April 2004; Accepted: 2 November 2004 / Published: 22 December 2004
Abstract: A polystyrene-based membrane of 2,10-dimethyl-4,12-diphenyl-1,5,9,13-tetraazacyclohexadeca-1,4,9,12-tetraene macrocyclic ionophore was prepared and investigated as Cr(III)-selective electrode. The best performance was observed with the membrane having the polystyrene-ligand-dibutylphthalate-sodiumtetraphenyl borate composition 1:4:1:1 with a Nernstian slope of 19.0 mV per decade of concentration between pH 3.0 and 6.5. This electrode has been found to be chemically inert and of adequate stability with a response time of 20 s and was used over a period of 100 d with good reproducibility (S= 0.3 mV). The membrane works satisfactorily in a partially non-aqueous medium up to a maximum 30% (v/v) content of methanol and ethanol. The potentiometric selectivity coefficient values indicate that the membrane sensor is highly selective for Cr(III) ions over a number of monovalent, divalent and trivalent cations. The membrane electrode has also been successfully used to determine Cr3+ in various food materials.
Keywords: chromium-selective electrode; macrocyclic ionophore; potentiometric sensor
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Singh, A.K.; Singh, R.; Saxena, P. Tetraazacyclohexadeca Macrocyclic Ligand as a Neutral Carrier in a Cr Ion-selective Electrode. Sensors 2004, 4, 187-195.
Singh AK, Singh R, Saxena P. Tetraazacyclohexadeca Macrocyclic Ligand as a Neutral Carrier in a Cr Ion-selective Electrode. Sensors. 2004; 4(12):187-195.
Singh, Ashok K.; Singh, Rupam; Saxena, Puja. 2004. "Tetraazacyclohexadeca Macrocyclic Ligand as a Neutral Carrier in a Cr Ion-selective Electrode." Sensors 4, no. 12: 187-195.