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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
Library Call Number Additional Info Location Last
NTIS  PB91-117457 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
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.)