title: Electrochemical sensing of ammonium ion at the water/1,6-dichlorohexane interface.
abstract: In this work, ion transfer and facilitated ion transfer of ammonium ion by a lipophilic cyclodextrin is investigated at the water/1,6-dichlorohexane micro-interface, using electrochemical approaches (cyclic voltammetry, differential pulse voltammetry and square wave voltammetry). The association constant has been obtained for the complex between ammonium ion and the cyclodextrin. Experimental conditions for the analytical determination of ammonium ion were established and a detection limit of 0.12 μM was obtained. The amperometric sensor gave a current response proportional to the ammonium ion concentration in the range from 4.2 to 66 μM.
authors.affiliation: Faculdade de Ciências da Universidade do Porto, Departamento de Química e Bioquímica, Centro de Investigação em Química - Linha 4, Rua do Campo Alegre 687, 4169-007 Porto, Portugal.
authors.forename: José A
authors.initials: JA
authors.lastname: Ribeiro
authors.forename: F
authors.initials: F
authors.lastname: Silva
authors.forename: Carlos M
authors.initials: CM
authors.lastname: Pereira
mesh_terms: D002412:Cations; D003505:Cyclodextrins / Q000737:chemistry; D003510:Cyclohexanes / Q000737:chemistry*; D057230:Limit of Detection; D011199:Potentiometry / Q000379:methods*; D000644:Quaternary Ammonium Compounds / Q000032:analysis*; D014867:Water / Q000737:chemistry*
chemical_list: D002412:Cations; D003505:Cyclodextrins; D003510:Cyclohexanes; D000644:Quaternary Ammonium Compounds; D014867:Water; C518164:1,6-dichlorohexane