Colorimetric detection of fluoride in an aqueous solution using Zr(IV)-EDTA complex and a novel hemicyanine dye.
Talanta
; 73(4): 770-5, 2007 Oct 15.
Article
en En
| MEDLINE
| ID: mdl-19073100
ABSTRACT
A new highly sensitive and selective colorimetric method for fluoride determination in water is described. The novel reagent used is a hemicyanine dye (HC), which forms a stable complex with Zr-EDTA, the fluoride-binding site, through the hydroxyl groups. The hemicyanine-chelating Zr-EDTA complex (HC-Zr-EDTA) is ready to react with fluoride ion to release HC. This result in remarkable color change of the sensing solutions from red (lambda(max)=513nm) to yellow (lambda(max)=427nm) at pH 4.40. When applied to the colorimetric determination of fluoride ions, a linear range from 3.0x10(-6) to 5.0x10(-5)mol/L and a detection limit of 2.8x10(-6)mol/L with a correlation coefficient of 0.9993 can be achieved under the optimized conditions. Because of the specific affinity of fluorides for the [Zr-EDTA], there is little interference by other ions. This method has been successfully applied to the determination of fluorides in toothpaste samples.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
Talanta
Año:
2007
Tipo del documento:
Article
País de afiliación:
China