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- W411460916 abstract "Concentrations and mass transport of pesticides and organic contaminants in the Mississippi River and some of its tributaries are reported for 1987-89 and 1991-92. Water samples collected during 1987-89 from the Lower Mississippi River and some of its tributaries were analyzed for (a) triazine herbicides and their degradation products (atrazine, desethylatrazine, desisopropyl-atrazine, cyanazine, and simazine); (b) chloroacetanilide herbicides and their degradation products (alachlor, 2-chloro-2',6'diethylacetanilide, 2-hydroxy-2',6'-diethylacetanilide, and metolachlor); (c) organic contaminants (2,6diethylaniline, l,3,5-trimethyl-2,4,6-triazinetrione, tris-2-chloroethylphosphate, tris-2chloropropylphosphate isomer A, and tris-2-chloropropylphosphate isomer B). Samples collected during 1991-92 from the entire navigable reach of the Mississippi River and some of its tributaries were analyzed for (a) triazine herbicides and their degradation products (ametryn, atrazine, desethylatrazine, desisopropylatrazine, cyanazine, cyanazineamide, hexazinone, metribuzin, prometon, prome'ryn, and simazine); (b) chloroacetanilide herbicides and their degradation products (alachlor, 2-chloro-2',6'diethylacetanilide, 2-hydroxy-2',6'-diethylacetanilide, and metolachlor); (c) miscellaneous pesticides and their transformation products (deet, diazinon, fluometuron, molinate, 4-ketomolinate, norflurazon, desmethylnorflurazon, and thiobencarb); (d) miscellaneous organic contaminants (2,6-diethylaniline, caffeine, 1,3,5-trimethyl-2,4,6-triazinetrione, tris-2-chloroethylphosphate, tris-2-chloropropylphosphate isomer A, and tris-2-chloropropylphosphate isomer B). Concentration and precision and recovery data for the analytes of interest are reported in tables. Determined concentrations are presented in tables. The transport of these compounds in kilograms per day was determined and is presented in graph? The maximum measured concentration of a triazine herbicides was 4,700 nanograms per liter (ng/L) of atrazine in a water sample collected near the mouth of the Kaskaskia River on July 28, 1991. This concentration equals a mass transport into the Mississippi River of about 3 kilograms per day (kjr/d). The maximum mass transport, however, was about 2,900 kg/d for the Mississippi River below Vicksburg, Mississippi, where the average concentration of atrazine was 1,550 ng/L on May 6,1992. The maximum measured concentration of a chloroacetanilide herbicide was 900 ng/L of alachlor in a water sample collected from the Mississippi River at Thebes, Illinois, on May 22,1988, when the water discharge of the Mississippi River was near record low levels this corresponds to a mass transport of about 280 kg/d. The maximum mass transport for alachlor was 660 kg/d for the Mississippi River at Helena, Arkansas, where the concentration was 450 ng/L on June 17,1989. The maximum measured concentration of an organic contaminant in the Mississippi River was an average of 853 ng/L of 2,6-diethylaniline in a water sample collected from the Mississippi River at St. Louis, Missouri, on May 20, 1988; the corresponding mass transport was 250 kg/d. The maximum mass transport was 300 kg/d for the Mississippi River at St. Louis, Missouri, on December 3,1987." @default.
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- W411460916 date "1995-01-01" @default.
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- W411460916 title "Concentrations and mass transport of pesticides and organic contaminants in the Mississippi River and some of its tributaries, 1987-89 and 1991-92" @default.
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- W411460916 doi "https://doi.org/10.3133/ofr94376" @default.
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