期刊
APPLIED SPECTROSCOPY
卷 68, 期 9, 页码 937-948出版社
SOC APPLIED SPECTROSCOPY
DOI: 10.1366/13-07390
关键词
Laser-induced breakdown spectroscopy; LIBS; Lanthanides; Lithium potassium chloride salt; Molten salt; Europium; Praseodymium
The versatility of laser-induced breakdown spectroscopy (LIBS) as an analytical method for high-temperature applications was demonstrated through measurement of the concentrations of the lanthanide elements europium (Eu) and praseodymium (Pr) in molten eutectic lithium chloride-potassium chloride (LiCI-KCI) salts at a temperature of 500 degrees C. Laser pulses (1064 nm, 7 ns, 120 mJ/pulse) were focused on the top surface of the molten salt samples in a laboratory furnace under an argon atmosphere, and the resulting LIBS signals were collected using a broadband Echelle-type spectrometer. Partial least squares (PLS) regression using leave-one-sample-out cross-validation was used to quantify the concentrations of Eu and Pr in the samples. The root mean square error of prediction (RMSEP) for Eu was 0.13% (absolute) over a concentration range of 0-3.01%, and for Pr was 0.13% (absolute) over a concentration range of 0-1.04%.
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