Abstract
Phthalate esters (PEs) form a class of organic pollutants whose chemical and physical properties relevant to their environmental transport and distribution are not completely known. Three PEs encompassing a wide range of molecular weights were studied as model compounds. Soil-water partition coefficients and rates of migration through river sand in laboratory column experiments were determined. Diethyl phthalate (DEP) has a low Kp and is fairly mobile, while di-(2-ethylhexyl) phthalate (DEHP) is strongly adsorbed and relatively immobile. Di-n-butyl phthalate (DBP), with an intermediate Kp, has a moderate mobility and exhibits a distinct flow rate dependence related to the mechanism of the adsorption and/or desorption process.
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