[Research of Hg2+ sol-gel membrane made of organically modified silicates].
Guang Pu Xue Yu Guang Pu Fen Xi
; 26(7): 1281-4, 2006 Jul.
Article
em Zh
| MEDLINE
| ID: mdl-17020040
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.
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Base de dados:
MEDLINE
Assunto principal:
Silanos
/
Mercúrio
Idioma:
Zh
Ano de publicação:
2006
Tipo de documento:
Article