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RECORD NUMBER: 144 OF 306

OLS Field Name OLS Field Data
Main Title Fluorescent Polycyclic Aromatic Hydrocarbons as Probes for Studying the Impact of Colloids on Pollutant Transport in Groundwater.
Author Backhus, D. A. ; Gschwend., P. M. ;
CORP Author Massachusetts Inst. of Tech., Cambridge. Ralph M. Parsons Lab.;Robert S. Kerr Environmental Research Lab., Ada, OK.;Department of Energy, Washington, DC.
Publisher c1990
Year Published 1990
Report Number EPA-R-812466, DE-FG02-86ER60413;
Stock Number PB91-117457
Additional Subjects Humic acids ; Sewage ; Colloids ; Ground water ; Fluorescence ; Probes ; Aromatic polycyclic hydrocarbons ; Extinguishing ; Water pollution ; Field tests ; Reprints ; Cape Cod(Massachusetts) ; Environmental transport
Holdings
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Status
NTIS  PB91-117457 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 03/04/1991
Collation 12p
Abstract
A fluorescence-quenching method was developed to assess the hydrophobic organic pollutant binding potential of organic colloids (OC) in unaltered natural waters. This method allows direct assessment of the importance of OC-enhanced pollutant transport for environmental samples under in situ water chemistry conditions, without requiring the isolation of OC or separation of equilibrated phases; testing of chemicals that suffer substantial wall losses from aqueous solutions; and examination of unstable water samples such as anoxic samples. The experiments show that some OC (Aldrich humic acids) fully quench OC-associated perylene fluorescence, but others (bovine serum albumin) do not. This implies that fluorescence-quenching results collected for a single (OC) or over a limited (OC) range provide only a lower limit estimate of the potential for OC association. Tests with groundwater, recharged with secondarily treated sewage and containing OC at concentrations of about 1 mg of C/L, showed temporal variation in the ability of OC present to quench or bind perylene. (Copyright (c) by the American Chemical Society, 1990.)