Trace determination of uranyl ion using a blue LED as excitation source in phase-resolved luminescence spectroscopy

MASSAD, WALTER A; ARGUELLO, GERARDO A; BADINI, RAÚL G

INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY

Año: 2000 vol. 77 p. 159 - 159

0306-7319

p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">A phase-resolved luminescence system based on the use of a light emitting diode (LED) is applied to the trace determination of uranyl ion ( UO22+). The system performance is evaluated, phase resolved spectra of  UO22+ are shown as well as its lifetime determination using multifrequency phase resolved measurements. Analytical figures of merit are also presented for this system. A limit of detection (LOD) of 10 ug/L is obtained at the blue LED excitation wavelength of 460 nm and its results compare well with a  conventional system. Also, a linear dynamic range of ca. 5 orders of magnitude is observed. In situ quenching correction of the analytical signal was evaluated and was applied to a real sample for uranyl dete