DISTRIBUTION AND TRANSPORT OF SELECTED ANTHROPOGENIC ORGANIC-COMPOUNDS ON MISSISSIPPI RIVER SUSPENDED SEDIMENT (USA), MAY JUNE 1988

The distribution and transport of selected hydrophobic halogenated org anic compounds on suspended sediment from the lower Mississippi River were determined using discharge-weighted sampling with concurrent disc harge measurements. Trends in compound concentration from upstream to downstream and the effects of selected tributaries were determined. Th e compounds identified on the suspended sediment include pentachlorobe nzene, hexachlorobenzene, pentachloroanisole, dacthal, chlordane (tran s-), nonachlor (trans-), chlorthalonil, and penta-, hexa-, hepta- and octachlorobiphenyls. Loads of most of the compounds increased from ups tream to downstream on the main stem of the Mississippi River. Of the tributaries studied, the Ohio River had the most significant effect on the loads.