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Göteborgs universitets publikationer

Hyperspectral imaging and data analysis for detecting and determining plastic contamination in seawater filtrates

Författare och institution:
Therese Karlsson (Institutionen för marina vetenskaper); Hans Grahn (-); Bert van Bavel (-); Paul Geladi (-)
Publicerad i:
Journal of Near Infrared Spectroscopy, 24 ( 2 ) s. 141-149
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
One possible way of monitoring plastic particles in sea water is by imaging spectroscopic measurements on filtrates. The idea is that filters from seawater sampling can be imaged in many wavelengths and that a multivariate data analysis can give information on (1) spatial location of plastic material on the filter and (2) composition of the plastic materials. This paper reports on simulated samples with spiked reference plastic particles, and real seawater filtrates containing microplastic pollutants. These real samples were previously identified through visual examination in a microscope. The samples were imaged using three different imaging systems. The different wavelength ranges were 375–970nm, 960–1662nm and 1000–2500nm. Data files from all three imaging systems were analysed by hyperspectral image analysis. The method using the wavelength span 1000–2500nm was shown to be the most applicable to this specific type of samples and gave a 100% particle recognition on reference plastic, above 300 µm and an 84% pixel recognition on household polyethylene plastic. When applied to environmental samples the technique showed an increase in identified particles compared with visual investigations. These initial tests indicate a potential underestimation of microplastics in environmental samples. This is the first study to demonstrate that hyperspectral imaging techniques can be used to study microplastics down to 300µm, which is a common size limit used in microplastic surveys.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Kemi ->
Analytisk kemi ->
Kemi ->
Geovetenskap och miljövetenskap ->
Miljövetenskap ->
Miljökemi ->
visualisation of multivariate results, interactive visual data handling, plastic identification, visual spectroscopy, near infrared spectroscopy, microplastics
Ytterligare information:
Affiliations: University of Örebro, MTM, School of Science and Technology, SE 701 82 Örebro, Sweden University of Gothenburg, Department of Marine Sciences, Sven Loven Research Centre, Kristineberg 566, 45178 Fiskebäckskil, Sweden Corpus Data & Image Analysis AB, Rålambsvägen 66 B, suite 1408, SE 112 56 Stockholm, Sweden Norwegian Institute for Water Resaerch, Gaustadalléen 21, NO-0349 Oslo, Norway Forest Biomaterials and Technology, Swedish University of Agricultural Sciences, SE 90183 Umea, Sweden
Postens nummer:
Posten skapad:
2016-05-11 15:54
Posten ändrad:
2016-07-05 14:19

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