Record Display for the EPA National Library Catalog


Main Title Effect of pH Concentration on the Transport of Naphthalene in Saturated Aquifer Media.
Author Kan, A. T. ; Tomson., M. B. ;
CORP Author National Center for Ground Water Research, Houston, TX.;Robert S. Kerr Environmental Research Lab., Ada, OK. Ground Water Research Branch.
Publisher c1990
Year Published 1990
Report Number EPA-R-812808; EPA/600/J-90/157;
Stock Number PB91-109959
Additional Subjects Water pollution ; pH ; Mathematical models ; Aquifers ; Naphthalene ; Kinetics ; Sorption ; Organic compounds ; Isotherms ; Ground water ; Reprints ; Environmental transport ; Soil contamination
Library Call Number Additional Info Location Last
NTIS  PB91-109959 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 19p
Sorption is one of the primary mechanisms for retarding the movement of organic contaminants in groundwater. Sorption of hydrophobic compounds such as toluene, naphthalene, and DDT is generally assumed to be linearly proportional to solution phase concentration. In the present research naphthalene was chosen as a model compound. Batch adsorption was studied from 0.01 to 1.00 mg/L. Transport of naphthalene through a specially designed soil column apparatus was studied from 5 to 9 pH and from 0.025 to 2.0 mg/L initial concentration. All transport data could be modeled using a single pH-modified Freundlich isotherm: q = 2.71 (1 - sigma delta pH)C(sup 0.81) r = 0.999 where q (microgram/g) is the amount of contaminant sorbed on the soil per g of soil, C is the contaminant concentration in the flowing water, sigma is a correction factor and delta pH = pH - 7. The exponent agrees with the batch data to within one percent and the partition coefficient is within a factor of two. The implications of these results to environmental transport modeling are discussed. (Copyright (c) 1990 Elsevier Science Publishers B.V.)