Analysis of car shredder polymer waste with Raman mapping and chemometrics

B. Vajna, B. Bodzay, A. Toldy, I. Farkas, T. Igricz, G. Marosi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A novel evaluation method was developed for Raman microscopic quantitative characterization of polymer waste. Car shredder polymer waste was divided into different density fractions by magnetic density separation (MDS) technique, and each fraction was investigated by Raman mapping, which is capable of detecting the components being present even in low concentration. The only method available for evaluation of the mapping results was earlier to assign each pixel to a component visually and to count the number of different polymers on the Raman map. An automated method is proposed here for pixel classification, which helps to detect the different polymers present and enables rapid assignment of each pixel to the appropriate polymer. Six chemometric methods were tested to provide a basis for the pixel classification, among which multivariate curve resolution-alternating least squares (MCR-ALS) provided the best results. The MCR-ALS based pixel identification method was then used for the quantitative characterization of each waste density fraction, where it was found that the automated method yields accurate results in a very short time, as opposed to manual pixel counting method which may take hours of human work per dataset.

Original languageEnglish
Pages (from-to)107-119
Number of pages13
JournalExpress Polymer Letters
Volume6
Issue number2
DOIs
Publication statusPublished - Feb 2012

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Polymers
Railroad cars
Pixels
pixels
polymers
evaluation
curves
low concentrations
counting

Keywords

  • Chemometrics
  • Hyperspectral imaging
  • Micro-Raman
  • Polymer waste
  • Recycling

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Chemical Engineering(all)
  • Organic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Analysis of car shredder polymer waste with Raman mapping and chemometrics. / Vajna, B.; Bodzay, B.; Toldy, A.; Farkas, I.; Igricz, T.; Marosi, G.

In: Express Polymer Letters, Vol. 6, No. 2, 02.2012, p. 107-119.

Research output: Contribution to journalArticle

Vajna, B. ; Bodzay, B. ; Toldy, A. ; Farkas, I. ; Igricz, T. ; Marosi, G. / Analysis of car shredder polymer waste with Raman mapping and chemometrics. In: Express Polymer Letters. 2012 ; Vol. 6, No. 2. pp. 107-119.
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