![]() ![]() Microplastics in samples may also be dyed during sample processing (e.g. Hyperspectral imaging for microplastic analysis is an emerging field. The accuracy of visual identification alone has been shown to be variable and quite low in some cases, especially for small microplastics (i.e. 10%) should be analyzed using spectroscopic methods, such as FT-IR and Raman spectroscopy, which are non-destructive and can identify polymer composition. ![]() Most commonly, after isolation from a matrix, suspected microplastics are counted under magnification by an optical microscope using visual identification clues. There are several approaches that researchers take to identify suspected microplastics. ![]() fibers, fragments, foams, spheres, films) and compositions (polymers, additives) and have received a lot of attention since their relatively small size makes them available for long-range transport and exposure to a wide range of organisms. Microplastics, defined as synthetic polymer particles in the size range from 1 micron to 5 mm, are a diverse contaminant class, consisting of different types (e.g. Defining the levels and potential impacts of plastic debris from macro to micro to nano in diverse environments has also grown and taken considerable effort in method development among researchers (e.g. Plastic is a ubiquitous material in the built and natural environment and the levels of this pollution, which has resulted from the exponential rise in the production, use and disposal of plastics during the twentieth century, poses a threat to the earth system. It is recommended that researchers assess their hot needle test methods against known standards of both target microplastics and background materials like natural fibers, report the response criteria used in their studies and optimally include spectroscopic verification of results for higher confidence. While cotton and semi-synthetic fiber results were less consistently identified ( 90% of microplastics that we selected from environmental samples (water, sediment) were confirmed by Raman microscopy. Microplastics are small ( 70% of the time. ![]()
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