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Open AccessArticle

Identification of Plastic Type and Surface Roughness of Film-Type Plastics in Water Using Kramers–Kronig Analysis

1
Department of Physics and Mathematics, University of Eastern Finland, FI-80100 Joensuu, Finland
2
Department of Electronics and Telecommunication Engineering, Dar Es Salaam Institute of Technology, 2958 Dar Es Salaam, Tanzania
3
MITY, University of Oulu, Technology Park, FI-87400 Kajaani, Finland
*
Authors to whom correspondence should be addressed.
Chemosensors 2020, 8(4), 88; https://doi.org/10.3390/chemosensors8040088
Received: 29 August 2020 / Revised: 16 September 2020 / Accepted: 21 September 2020 / Published: 23 September 2020
(This article belongs to the Section Optical Chemical Sensors)
The knowledge of the plastic type, thickness, and the nature of the surface is important towards the monitoring of microplastic pollution in water bodies, especially when vis-NIR spectroscopy is utilized. Factors such as complex environment and surface roughness induced-light scattering of the probing light limit the optical detection of these parameters in in-situ measurements, however. In this paper, a novel application of Kramers–Kronig analysis was exploited to identify both smooth and rough film-type macroplastics with unknown thickness. This method is particularly useful in the in-situ identification of unknown film-like macroplastics; although the sample is large, the ratio function is detected from an area that corresponds to the size of a MP. Therefore, it can be applied for the case of large size MPs. The validity of the method was demonstrated using transmittance data for smooth and roughened plastics given in Kanyathare et al., 2020. View Full-Text
Keywords: microplastic; Kramers–Kronig relation; surface roughness; transmittance; vis-NIR spectroscopy microplastic; Kramers–Kronig relation; surface roughness; transmittance; vis-NIR spectroscopy
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MDPI and ACS Style

Kanyathare, B.E.; Asamoah, B.; Ishaq, M.U.; Amoani, J.; Räty, J.; Peiponen, K.-E. Identification of Plastic Type and Surface Roughness of Film-Type Plastics in Water Using Kramers–Kronig Analysis. Chemosensors 2020, 8, 88.

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