title: Highly selective and sensitive optical sensor for determination of Pb2+ and Hg2+ ions based on the covalent immobilization of dithizone on agarose membrane.
abstract: A highly sensitive and selective optical membrane for determination of Hg(2+) and Pb(2+) was prepared by covalent immobilization of dithizone on agarose membrane. In addition to its high stability, reproducibility and relatively long lifetime, the proposed optical sensor revealed good selectivity for target ions over a large number of alkali, alkaline earth, transition, and heavy metal ions. The proposed optical membrane displays linear responses from 1.1×10(-8) to 2.0×10(-6) mol L(-1) and 1.2×10(-8) to 2.4×10(-6) mol L(-1) for Hg(2+) and Pb(2+), respectively. The limits of detection (LOD) were 2.0×10(-9) mol L(-1) and 4.0×10(-9) mol L(-1) for Hg(2+) and Pb(2), respectively. The prepared optical membrane was successfully applied to the determination of Hg(2+) and Pb(2+) in industrial wastes, spiked tap water and natural waters without any preconcentration step.
authors.affiliation: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran. Electronic address: Kiomarszargoosh@cc.iut.ac.ir.
authors.forename: Kiomars
authors.initials: K
authors.lastname: Zargoosh
authors.affiliation: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: Fatemeh Farhadian
authors.initials: FF
authors.lastname: Babadi
mesh_terms: D002413:Cations, Divalent / Q000032:analysis; D004230:Dithizone / Q000737:chemistry*; D007854:Lead / Q000032:analysis*; D057230:Limit of Detection; D008567:Membranes, Artificial; D008628:Mercury / Q000032:analysis*; D012685:Sepharose / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods
chemical_list: D002413:Cations, Divalent; D008567:Membranes, Artificial; D007854:Lead; D004230:Dithizone; D012685:Sepharose; D008628:Mercury
keywords: Agarose membrane; Dithizone; Heavy metal; Lead; Mercury; Optical sensor