Microplastics are a type of plastic marine debris that are less than five millimeters in size. Research on this type of debris has become more widespread, but since there is no single agreed-upon method for separating, counting, and weighing microplastics in water samples, it is difficult to compare results across studies. Common approaches may be used, but most laboratories develop their own procedures based on factors such as budget, equipment availability, labor, and the specific research questions being asked.
Since so many different protocols are being used, the NOAA Marine Debris Program partnered with researchers at the University of Washington Tacoma to compare different methodologies.