Process analysis of recycled thermoplasts from consumer electronics by laser-induced plasma spectroscopy.
An experimental setup for direct elemental analysis of recycled thermoplasts from consumer electronics by laser-induced plasma spectroscopy (LIPS, or laser-induced breakdown spectroscopy, LIBS) was realized. The combination of a echelle spectrograph, featuring a high resolution with a broad spectral coverage, with multivariate methods, such as PLS, PCR, and variable subset selection via a genetic algorithm, resulted in considerable improvements in selectivity and sensitivity for this complex matrix. With a normalization to carbon as internal standard, the limits of detection were in the ppm range. A preliminary pattern recognition study points to the possibility of polymer recognition via the line-rich echelle spectra. Several experiments at an extruder within a recycling plant demonstrated successfully the capability of LIPS for different kinds of routine on-line process analysis.
Fink
Herbert
H
Institute of Hydrochemistry, Technical University of Munich, Germany.
Panne
Ulrich
U
Niessner
Reinhard
R
D004581:Electronics; D017743:Equipment Reuse; D007220:Industrial Waste / Q000032:analysis / Q000517:prevention & control*; D007834:Lasers; D010969:Plastics / Q000032:analysis*; D013057:Spectrum Analysis
D007220:Industrial Waste; D010969:Plastics