title: Distribution of selected halogenated organic compounds among suspended particulate, colloid, and aqueous phases in the Mississippi river and major tributaries.
abstract: Suspended particulate, colloid, and aqueous phases were separated and analyzed to determine spatial variation of specific organic compound transport associated with each phase in a dynamic river system. Sixteen sites along the Mississippi River and its major tributaries were sampled at low-flow conditions to maximize the possibility of equilibrium. Across the solubility range studied, the proportion transported by each phase depended on the compound solubility, with more water-soluble compounds (dacthal, trifluralin) transported predominantly in the aqueous phase and less-water soluble compounds (polychlorinated biphenyls, chlordane-related compounds) transported predominantly in the particulate and colloid phases.
authors.affiliation: United States Geological Survey, Building 95, Mail Stop 408, Denver Federal Center, Box 25046, Denver, CO 80225, USA. cerostad@usgs.gov
authors.forename: C E
authors.initials: CE
authors.lastname: Rostad
authors.forename: S R
authors.initials: SR
authors.lastname: Daniel
mesh_terms: D000840:Anisoles / Q000032:analysis; D003102:Colloids; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010795:Phthalic Acids / Q000032:analysis; D045483:Rivers / Q000737:chemistry*; D012995:Solubility; D014274:Trifluralin / Q000032:analysis; D014481:United States; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000840:Anisoles; D003102:Colloids; D006843:Hydrocarbons, Chlorinated; D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; C015421:pentachloroanisole; C007220:dimethyl 2,3,5,6-tetrachloroterephthalate; D014274:Trifluralin