Direct Fluorescence Quantification of Chromium(VI) in Wastewater with Organic Nanoparticles Sensor

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  • WANG Leyu
    College of Chemistry and Materials Science, Anhui Normal University
  • WANG Lun
    College of Chemistry and Materials Science, Anhui Normal University
  • XIA Tingting
    College of Chemistry and Materials Science, Anhui Normal University
  • DONG Ling
    College of Chemistry and Materials Science, Anhui Normal University
  • BIAN Guirong
    College of Chemistry and Materials Science, Anhui Normal University
  • CHEN Hongqi
    College of Chemistry and Materials Science, Anhui Normal University

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  • Direct Fluorescence Quantification of Chromium 6 in Wastewater with Organic Nanoparticles Sensor

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Abstract

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 (∼20%) and a long fluorescence lifetime (∼0.2 µs). 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 × 10-6 - 1.0 × 10-4 mol L-1. The detection limit was 2.8 × 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.

Journal

  • Analytical Sciences

    Analytical Sciences 20 (7), 1013-1017, 2004

    The Japan Society for Analytical Chemistry

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