title: A highly selective optode for determination of Hg (II) by a modified immobilization of indigo carmine on a triacetylcellulose membrane.
abstract: A new mercury optical sensor was designed with indigo carmine (IC) as a dye indicator. The water-soluble indicator was lipophilized in the form of an ion-pair with N-cetyl pyridinium chloride (CPC) and dissolved in methanol (70 °C), then immobilized on a triacetylcellulose membrane. This optode exhibits a linear range of 24.0-468.0 μM of the Hg (II) ion concentration with detection limit of 7.2 μM at 669.5 nm. Response time was within 8-10 min, depending on the Hg (II) ion concentration. The sensor could readily be regenerated with a hydrochloric acid solution (0.01 M) in a reversible manner and its response was reproducible (RSD=3.2%). The method was applied to the determination of mercury content of a variety of samples which gave satisfactory results.
authors.affiliation: Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran. Tavallali@pnu.ac.ir
authors.forename: Hossein
authors.initials: H
authors.lastname: Tavallali
authors.forename: Elham
authors.initials: E
authors.lastname: Shaabanpur
authors.forename: Parvin
authors.initials: P
authors.lastname: Vahdati
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D002594:Cetylpyridinium / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D007203:Indigo Carmine / Q000737:chemistry*; D057230:Limit of Detection; D008567:Membranes, Artificial; D008628:Mercury / Q000032:analysis*; D013053:Spectrophotometry / Q000379:methods*
chemical_list: D004396:Coloring Agents; D008567:Membranes, Artificial; D002482:Cellulose; C024671:cellulose triacetate; D002594:Cetylpyridinium; D007203:Indigo Carmine; D008628:Mercury