||Insecticide Adsorption by Lake Sediments as a Factor Controlling Insecticide Accumulation in Lakes.
Chester, Gordon ;
Le, Gerhard B. ;
||Wisconsin Univ., Madison. Water Resources Center.
||DI-14-01-0001-1567; OWRR-B-016-WIS; 04081,; AB-016-WIS(15)
( Pesticides ;
( Limnology ;
( Water pollution ;
Labeled substances ;
Phosphorus organic acid esters ;
Chlorine organic compounds ;
Tracer studies ;
Surface water runoff ;
Soil chemistry ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||The investigation was divided into three phases: development of methodology for determination of pesticides in aquatic systems, determination of the extent of pesticide adsorption on intact lake sediments and on isolated mineral and organo-clay fractions of lake sediments; and an evaluation of the rates and mechanisms of degradation of certain pesticides in the aquatic environment. Methods were developed for the unified determination of light organo chlorine and five organophosphorus insecticides at the 0.06 to 1.0 ug/liter level. Extent of adsorption of gamma-BHC, malathion, and parathion on sediments was determined. The most important factors governing adsorption were pesticide: sediment ratio, sediment concentration, pesticide concentration, and organic matter content. The rate and mechanism of degradation of parathion was determined. (Author)
|NTIS Title Notes
||Final technical completion rept.
|PUB Date Free Form
||8H; 6F; 64H; 68D; 57P
||PC A05/MF A01