Direct fluorescence quantification of chromium(VI) in wastewater with organic nanoparticles sensor.
Under ultrasonic irradiation, organic fluorescence nanoparticles have been prepared by a reprecipitation method. Compared with single organic fluorophores, these nanoparticles are brighter, more stable against photobleaching and more water-soluble. They also have high room-temperature fluorescence quantum yields (approximately 20%) and a long fluorescence lifetime (approximately 0.2 micros). Based on the fluorescence quenching of nanoparticles by chromium(VI), a method for the selective determination of chromium(VI) without the separation of chromium(III) in water was developed. Under the optimal conditions, the linear range of the calibration curve was 7.0 x 10(-6) - 1.0 x 10(-4) mol L(-1). The detection limit was 2.8 x 10(-6) mol L(-1). The method is characterized by a short reaction time, stable fluorescence signals, simplicity and high selectivity. The present assay has been applied to the selective quantification of Cr(VI) in wastewater with satisfactory results.
Wang
Leyu
L
College of Chemistry and Materials Science, Anhui Normal University, Wuhu, China. wangly73@yahoo.com
Wang
Lun
L
Xia
Tingting
T
Dong
Ling
L
Bian
Guirong
G
Chen
Hongqi
H
D002138:Calibration; D002857:Chromium / Q000032:analysis*; D007477:Ions; D008854:Microscopy, Electron; D036103:Nanotechnology / Q000379:methods*; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013464:Sulfuric Acids / Q000494:pharmacology; D013696:Temperature; D014131:Trace Elements; D014465:Ultrasonics; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical
D007477:Ions; D013464:Sulfuric Acids; D014131:Trace Elements; D014874:Water Pollutants, Chemical; D014867:Water; D002857:Chromium; C074702:chromium hexavalent ion; C033158:sulfuric acid