title: [Research of Hg2+ sol-gel membrane made of organically modified silicates].
abstract: A photochemical sensor for the determination of Hg2+ consisting of organically modified silicates (ormosils) was developed. Hg(2+)-sensitive fluorescent sol-gel films were prepared by co-condensation of tetramethoxysilane (TMOS) and dimethyldimethoxysilane (DMOS), and the fluorescent indicator 5,10,15, 20-tetra (p-sulfonatophenyl) porphyrin sodium was embedded in sol-gel in the form of ion pairs with cetyltrimethyl ammonium bromide. The optimization condition of preparation and response performance of sol-gel membrane were investigated. The experimental results showed a linear range of Hg2+ concentrations from 1.0 x 10(-5) to 1.0 x 10(-4) mol x L(-1) in a Tris-HCl buffer at pH 8.0 with fast response and good repetition. The indicators in the sol-gel membrane did not leak out and the sensor showed good selectivity over other metal ions.
authors.affiliation: Institute of Food Safety and Environmental Monitoring, Fuzhou University, Fuzhou 350002, China.
authors.forename: Liang-Qia
authors.initials: LQ
authors.lastname: Guo
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Jian-Feng
authors.initials: JF
authors.lastname: Yan
authors.forename: Xu-Cong
authors.initials: XC
authors.lastname: Lin
authors.forename: Zeng-Hong
authors.initials: ZH
authors.lastname: Xie
authors.forename: Guo-Nan
authors.initials: GN
authors.lastname: Chen
mesh_terms: D005782:Gels; D008628:Mercury / Q000032:analysis*; D011166:Porphyrins / Q000032:analysis; D012821:Silanes / Q000737:chemistry*; D017640:Silicates
chemical_list: D005782:Gels; D011166:Porphyrins; D012821:Silanes; D017640:Silicates; C509598:tetra(4-sulfonatophenyl)porphyrin; C061205:tetramethoxysilane; D008628:Mercury