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Time variable model of the fate of DDE and lindane in a quarry
Author(s) -
Di Toro Dominic M.,
Paquin Paul R.
Publication year - 1984
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620030215
Subject(s) - water column , sediment , lindane , particulates , environmental science , environmental chemistry , hydrology (agriculture) , sorption , chemistry , geology , ecology , pesticide , geotechnical engineering , oceanography , biology , geomorphology , organic chemistry , adsorption
A time variable model has been used to analyze a field scale experiment in which a flooded limestone quarry was dosed with equal quantities of Lindane and DDE. The water column and sediment chemical concentrations were monitored for one year after the initial dosing. The markedly different physical‐chemical characteristics of the test chemicals provided an interesting contrast for model application. A simplified time variable model of partitioning chemicals is cast in the form of analytical solutions for the total, dissolved and particulate concentrations of chemical in completely mixed, interactive, water column and sediment compartments. The model formulation incorporates chemical decay and transport mechanisms of particulate and diffusive exchange between water column and sediment. The Lindane and DDE model calibrations based on data from the first year after dosing are presented. A preliminary verification of the model, obtained by projecting DDE levels in the water and sediment five years after initial dosing, when the quarry was revisited, is also shown. The model results underscore the significance of chemical partitioning on chemical fate and highlight the importance and utility of a modeling framework which incorporates realistic mechanisms of water column and sediment interaction.