title: Colorimetric detection of fluoride in an aqueous solution using Zr(IV)-EDTA complex and a novel hemicyanine dye.
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.
authors.affiliation: Key Laboratory of Analytical Sciences, Ministry of Education, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Gao
authors.forename: Hong
authors.initials: H
authors.lastname: Zheng
authors.forename: Gui-Qin
authors.initials: GQ
authors.lastname: Shang
authors.forename: Jin-Gou
authors.initials: JG
authors.lastname: Xu