Archives of Environmental Contamination and Toxicology

, Volume 53, Issue 2, pp 151-158

First online:

Distribution of Selected Halogenated Organic Compounds Among Suspended Particulate, Colloid, and Aqueous Phases in the Mississippi River and Major Tributaries

  • C. E. RostadAffiliated withUnited States Geological Survey Email author 
  • , S. R. DanielAffiliated withDepartment of Chemistry and Geochemistry, Colorado School of Mines

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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.