[Research of Hg2+ sol-gel membrane made of organically modified silicates].
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.
Guo
Liang-Qia
LQ
Institute of Food Safety and Environmental Monitoring, Fuzhou University, Fuzhou 350002, China.
Zhang
Wei
W
Yan
Jian-Feng
JF
Lin
Xu-Cong
XC
Xie
Zeng-Hong
ZH
Chen
Guo-Nan
GN
D005782:Gels; D008628:Mercury / Q000032:analysis*; D011166:Porphyrins / Q000032:analysis; D012821:Silanes / Q000737:chemistry*; D017640:Silicates
D005782:Gels; D011166:Porphyrins; D012821:Silanes; D017640:Silicates; C509598:tetra(4-sulfonatophenyl)porphyrin; C061205:tetramethoxysilane; D008628:Mercury