title: A dual colorimetric and fluorescent sensor for lead ion based on naphthalene hydrazone derivative.
abstract: A new compound, 2-boronobenzaldehyde-(2'-hydroxyl-4'-sulfonic acid) naphthalene hydrazone (1), was synthesized and its structure was characterized by proton nuclear magnetic resonance, mass and element analyses. The presence of Pb(2+) led 1 to undergo colorimetric and fluorescent changes, which were detectable with the naked eye. Thus, a dual spectral response for Pb(2+) detection was introduced. In KH2PO4-NaOH buffer aqueous solution (pH 6.0), 1 exhibited fluorescence enhancement at 568 nm and hyperchromicity at 595 nm upon the addition of Pb(2+). The fluorescent intensity change was proportionate to the concentration of Pb(2+) with a dynamic working range of 5.0×10(-7) mol L(-1) to 1.0×10(-4) mol L(-1) and a detection limit of 3.7×10(-8) mol L(-1). The fluorometric method was successfully applied for the detection of Pb(2+) water of Qianhu Lake and soil in Nanchang university campus. The recoveries were 111-116% for water and 97.6% for soil respectively, determined via the standard addition method.
authors.affiliation: Department of Chemistry, Nanchang University, Nanchang 330031, China. fywu@ncu.edu.cn
authors.forename: Fang-Ying
authors.initials: FY
authors.lastname: Wu
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Ming
authors.initials: M
authors.lastname: Xiao
authors.forename: Bing-Xin
authors.initials: BX
authors.lastname: Han
mesh_terms: D002413:Cations, Divalent / Q000032:analysis; D003124:Colorimetry / Q000379:methods; D005456:Fluorescent Dyes / Q000737:chemistry*; D006835:Hydrazones / Q000737:chemistry*; D007854:Lead / Q000032:analysis*; D057230:Limit of Detection; D009281:Naphthalenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D002413:Cations, Divalent; D005456:Fluorescent Dyes; D006835:Hydrazones; D009281:Naphthalenes; C031721:naphthalene; D007854:Lead