title: Selective fluorescence determination of chromium (VI) in water samples with terbium composite nanoparticles.
abstract: The strong fluorescence Tb/acetyl acetone (acac)/Poly (Acrylamide) (PAM) composite nanoparticles have been prepared under ultrasonic radiation. The nanoparticles were water-soluble, stable and have extremely narrow emission bands and high internal quantum efficiencies. Based on the fluorescence quenching of Tb/acac/PAM by Cr (VI), a method for the selective determination of Cr (VI), without separation of Cr (III) in water, was developed. The reaction condition between Cr (VI) and Tb/acac/PAM were investigated in detail. Under optimal experimental conditions, the linear calibration curve was obtained over the concentration range of 5-600 ng mL(-1) with a correlation coefficient of 0.9939. The corresponding detection limit is 0.8 ng mL(-1) and the relative standard deviation is 1.5% for 0.05 microg mL(-1) (n=7). The proposed method has been applied to the selective quantification of Cr (VI) in synthetic samples and waste-water samples with the satisfactory results. The assay is characterized by short reaction time, very few interference, stable fluorescence signals, simple instrument and simplicity.
authors.affiliation: College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000, China. wanglun@mail.ahnu.edu.cn
authors.forename: Lun
authors.initials: L
authors.lastname: Wang
authors.forename: Guirong
authors.initials: G
authors.lastname: Bian
authors.forename: Ling
authors.initials: L
authors.lastname: Dong
authors.forename: Tingting
authors.initials: T
authors.lastname: Xia
authors.forename: Shi
authors.initials: S
authors.lastname: Hong
authors.forename: Hongqi
authors.initials: H
authors.lastname: Chen
mesh_terms: D002857:Chromium / Q000737:chemistry*; D005453:Fluorescence; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods* / Q000639:trends*; D013725:Terbium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D013725:Terbium; D002857:Chromium