title: Microplastic pollution discovered in St. Lawrence River  sediments.
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis*; D010969:Plastics; D011792:Quebec; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D010969:Plastics; D014874:Water Pollutants, Chemical