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. 2019 Apr 18;19(8):1839. doi: 10.3390/s19081839

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Raman spectra of individual polyethylene (PE) microparticles in water with various contaminants streaming with 1 L/h through the flow cell as recorded. Integration time T_opt = T_eff = 33 ms (16 ms in case of humic acid contamination; beam width within the flow cell: 1 mm; laser power within the flow cell: 1.54 W/mm²).