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RECORD NUMBER: 38 OF 1212

OLS Field Name OLS Field Data
Main Title Adsorption and desorption of hexachlorobiphenyl : A. Experimental results and discussions : B. Analysis of exchangeable and nonexchangeable components /
Author Di Toro, Dominic M. ; Horzempa, Lewis M. ; Casey, Maureen C.
Other Authors
Author Title of a Work
Horzempa, Lewis M.
Casey, Maureen C.
CORP Author Manhattan Coll., Bronx, NY. Environmental Engineering and Science Program.;Environmental Research Lab.-Duluth, MN.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, Environmental Research Laboratory,
Year Published 1983
Report Number PB83-261677; EPA-600/3-83-088; EPA-R-805229; EPA-R-807853
Stock Number PB83-261677
OCLC Number 79802749
Subjects Organochlorine compounds--Absorption and adsorption. ; Hexachlorobiphenyl--Absorption and adsorption.
Additional Subjects Mathematical models ; Water pollution ; Sediments ; Chlorine organic compounds ; Adsorption ; Desorption ; Great Lakes ; Isotherms ; Equilibrium ; Sites ; Biphenyl/hexachloro ; Path of pollutants ; Sediment-water interfaces ; Chlorinated biphenyls ; Water polution sampling ; Mass balance ; Numerical solution
Internet Access
Description Access URL
http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=91015DUI.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
EJBD ARCHIVE EPA 600-3-83-088 Headquarters Library/Washington,DC 12/17/2012
ELDD  EPA 600-3-83-088 3 copies NHEERL/MED Library/Duluth,MN 07/05/2012
NTIS  PB83-261677 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation [322] p. : charts ; 28 cm.
Abstract
The purpose of this report is to present the experimental and theoretical results that lead to the development model for the analysis of adsorption and desorption of hexachlorobiphenyl from suspended and sedimented particles. The reversibility of the adsorption reaction between dissolved organic chemicals and naturally occurring soils, sediments, and suspended particles is of fundamental importance in the understanding of the fate of these chemicals in the environment. The issue of reversibility becomes critical if the adsorption-desorption behavior of a chemical is to be expressed quantitatively within the framework of mass balance equations.
Notes
"PB83-261677." "EPA-600/3-83-088." "September 1983." "January 1982"--Bottom of title page. Includes bibliographical references (p. 134-137). Photocopy.
Contents Notes
Part A -- I Summary and recommendations -- II Introduction and previous work -- III Experimental methodology and initial experimental results --- IV Kinetics -- V Effect of solution composition -- VI Sediment composition effects -- VII Sediment concentration effects -- VIII Reversibility of adsorption and desorption -- Part B -- I Exchangeable and nonexchangeable components model of adsorption and desorption -- II Effect of sediment concentration and composition -- III Resuspension and dilution: implications for fate of PCB The purpose of this report is to present the experimental and theoretical results that lead to the development model for the analysis of adsorption and desorption of hexachlorobiphenyl from suspended and sedimented particles. The reversibility of the adsorption reaction between dissolved organic chemicals and naturally occurring soils, sediments, and suspended particles is of fundamental importance in the understanding of the fate of these chemicals in the environment. The issue of revresibility becomes critical if the adsorptioin-desorption behavior of a chemical is to be expressed quantitatively within the fframework of mass balance equations. In the formulations used to date, with a notable exception to be discussed below, the furmulations used to express the adsorption and desorption reactions assume reversible behavior, that is, at equilibrium, the same isotherm applies for adsorption and desorption. The difficulty with this assumption is that for many organic chemicals and many naturally occuring adsorbents, laboratory adsoption and subsequent desorption experiments demonstrate only partially reversible behavior. In the experiment described in Part A, Section VIII, this nonsingular behavior was confirmed and, using various experimental procedures, it was found to persist. This suggests that it is necessary to account for this behavior in a quantitative and consistent way. It is the purpose of Part B of this report to present a framework within which this nonsingular behavior can be analyzed in a manner that can be easily incorporated into mass balance calculations.