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Microplastics in urban New Jersey freshwaters: distribution, chemical identification, and biological affects

1 Department of Environmental Sciences, School of Environmental and Biological Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ
2 Department of Biochemistry and Microbiology, School of Environmental and Biological Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ
3 Graduate Program in Biochemistry and Microbiology, Rutgers, The State University of New Jersey, New Brunswick, NJ
4 Environmental and Occupational Health Sciences Institute, Rutgers, The State University of New Jersey, Piscataway, NJ
5 NOAA Fisheries, James J. Howard Marine Sciences Laboratory, Sandy Hook, NJ
6 NY/NJ Baykeeper, 52 W. Front St., Keyport, NJ
7 Undergraduate Program in Environmental Sciences, School of Environmental and Biological Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ

This proof of concept study was undertaken to test methodologies to characterize potential environmental risk associated with the presence of microplastics in surface waters. The goals of the study were to determine whether urban New Jersey freshwaters contained microplastic pollutants, and if so, to test analytic techniques that could potentially identify chemical compounds associated with this pollution. A third objective was to test whether identified associated compounds might have physiological effects on an aquatic organism. Using field collected microplastic samples obtained from the heavily urbanized Raritan and Passaic Rivers in New Jersey, microplastic densities, types, and sizes at 15 sampling locations were determined. Three types of plastic polymers were identified using pyrolysis coupled with gas chromatography (Pyr-GC/MS). Samples were further characterized using solid phase micro extraction coupled with headspace gas chromatography/ion trap mass spectrometry (HS-SPME-GC/ITMS) to identify organic compounds associated with the: (i) solid microplastic fraction, and (ii) site water fraction. Identical retention times for GC peaks found in both fractions indicated compounds can move between the two phases, potentially available for uptake by aquatic biota in the dissolved phase. Patterns of tentatively identified compounds were similar to patterns obtained in Pyr-GC/MS. Embryonic zebrafish exposed to PyCG/MS- identified pure polymers in the 1–10 ppm range exhibited altered growth and heart defects. Using two analytic methods (SPME GC/MS and Pyr-GC/MS) allows unambiguous identification of compounds associated with microplastic debris and characterization of the major plastic type(s). Specific “fingerprint” patterns can categorize the class of plastics present in a waterbody and identify compounds associated with the particles. This technique can also be used to identify compounds detected in biota that may be the result of ingesting plastics or plastic-associated compounds.
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Copyright Info: © 2017, B. Ravit, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0))

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