Laser-excited ionic fluorescence spectrometry of rare earth elements in the inductively coupled plasma
ABSTRACT A pulsed tunable dye laser pumped with an excimer laser is used to excite ionic fluorescence of the rare earth elements in the inductively-coupled plasma. Because several fluorescence lines were observed after laser excitation, it was possible to draw partial energy-level diagrams for most of the rare earths. Non-resonance fluorescence lines were used for all measurements in order to minimize spectral interferences. Detection limits at given excitation wavelengths are reported for each element. Laser-excited ionic fluorescence eliminates the problem of spectral interferences which has been associated with determination of the rare earths by atomic emission spectrometry in the inductively-coupled plasma.
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ABSTRACT: A diode laser based system for the detection of Li in an inductively coupled plasma (ICP) by diode laser induced fluorescence (DLIF-ICP) has been developed and successfully applied to the determination of lithium in several mineral waters and a thermal salt. The experimental setup is based on an unmodulated, continuous wave diode laser, emitting light at around 670 nm and exciting neutral Li atoms on their 2s 2S–2p 2P° transition, which was coupled to a commercial ICP atomic emission spectrometer. The spectrometer's monochromator, photomultiplier detector and built-in data acquisition software were utilized to collect background corrected fluorescence and emission signals. A simple, three-step measurement procedure was devised that corrected for the contribution of lithium thermal emission and scattered laser light in the analytical signals. Despite the facts that lithium was detected on its neutral atom, which accounts for less than 1% of the total concentration of Li in the ICP, and that only about 1–2% of all atoms could be excited by the laser light at any given time, the limit of detection (LOD) was still found to be as good as 8 μg/L. The LODs of the DLIF-ICP technique are therefore expected to be in the low ng/L range for elements that can be detected under more advantageous conditions. The linear dynamic range was found to be around three orders of magnitude.Spectrochimica Acta Part B Atomic Spectroscopy 03/2005; DOI:10.1016/j.sab.2004.12.005 · 3.15 Impact Factor
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ABSTRACT: A comprehensive table of atomic fluorescence spectrometry results has been compiled and arranged by element. Data tabulated include excitation and fluorescence wavelengths, atom reservoir, excitation source, limits of detection, and comments concerning experimental peculiarities and types of samples analyzed.Applied Spectroscopy 03/1989; 43(3):376-414. DOI:10.1366/0003702894202896 · 2.01 Impact Factor
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ABSTRACT: Laser-induced fluorescence measurements of five lanthanide rare earth elements (Ce, Dy, Er, Gd and Sm) have been performed in the inductively coupled plasma. Analytical limits of detection are reported for comparison with other standard methods of elemental analysis. In addition, a preliminary study of a typical spectral interference of two rare earth elements (Dy and Gd) indicates that the usually high spectral selectivity of one-step laser-induced fluorescence can be degraded at high laser intensities.Analytica Chimica Acta 03/1992; 258(1):73-81. DOI:10.1016/0003-2670(92)85199-G · 4.52 Impact Factor