Laser-induced fluorescence detection of lead atoms in a laser-induced plasma: an experimental analytical optimization study

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DOIResolve DOI: http://doi.org/10.1016/j.sab.2009.03.021
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TypeArticle
Journal titleSpectrochimica Acta Part B: Atomic Spectroscopy
Volume64
Issue4
Pages347353; # of pages: 7
SubjectLaser-induced fluorescence detection; lead atoms; laser-induced plasma; laser-induced breakdown spectroscopy (LIBS); laser-induced fluorescence (LIF); Enhanced sensibility; Limit of detection
AbstractThe combination of the laser-induced breakdown spectroscopy (LIBS) and laser-induced fluorescence (LIF) techniques was investigated to improve the limit of detection (LOD) of trace elements in solid matrices. The influence of the main experimental parameters on the LIF signal, namely the ablation fluence, the excitation energy, and the inter-pulse delay, was studied experimentally and a discussion of the results was presented. For illustrative purpose we considered detection of lead in brass samples. The plasma was produced by a Q-switched Nd:YAG laser and then re-excited by a nanosecond Optical Parametric Oscillator (OPO) laser. The experiments were performed in air at atmospheric pressure. We found out that the optimal conditions were obtained for our experimental set-up using relatively weak ablation fluence of 2-3 J/cm² and an inter-pulse delay of abuot 5-10 µs. Also, a few tens of microjoules was typically required to maximize the LIF signal. Using the LIBS-LIFS technique, a single-shot LOD for lead of about 1.5 part per million (ppm) was obtained while a value of 0.2 ppm was obtained after accumulating over 100 shots. These values represent an improvement of about two orders of magnitude with respect to LIBS.
Publication date
PublisherElsevier
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LanguageEnglish
AffiliationNRC Industrial Materials Institute (IMI-IMI); National Research Council Canada
Access conditionavailable
unlimited
public
Peer reviewedYes
NRC number52335
NPARC number10976302
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Record identifierb8644ae3-af30-4472-a86b-7e696c99f441
Record created2009-10-03
Record modified2016-05-09
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