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GLIN==> Upcoming GLERL/CILER Seminar




Date:   July 25, 2001

Time:   10:30 a.m.

Where:  GLERL Main Conference Room

Title:  Effect of sediment “quality” on the desorption and
bioavailability of sediment-associated chemicals.

Speaker:  Prof. Jussi Kukkonen
               Department of Biology
               University of Joensuu
               Joensuu, Finland

Abstract:  Organic carbon is generally considered the major
variable affecting the bioavailability of nonpolar
sediment-associated contaminants.  Yet, it appears that
normalizing accumulation data to the fraction of organic carbon in
sediment is inadequate to account for all of the variability in
the data.  Partitioning studies indicate that contaminant sorption
and bioavailability may be affected by different forms of organic
carbon as well as the amount.  The objective of this project is to
study the binding of organic non-polar compounds to different
types of natural sediments and determine the bioavailability of
the sediment-bound compounds to benthic organisms.  Seven
sediments were gathered from several locations in the United
States.  The desorption rates and accumulation kinetics into
Diporeia spp and Lumbriculus variegatus were measured for pyrene,
benzo[a]pyrene (BaP), 3,4,3’,4’-tetrachlorobiphenyl (TCBP) and
2,4,5,2’,4’,5’-hexachlorobiphenyl (HCBP) sorbed to each sediment.
Extensive sediment characterization was also performed including
TOC, TON, sootC, particle size distribution, pigments, amino
acids, and NaOH extractable OC. The TOC content, soot particles or
TON content of the sediment did not explain the variation in
bioavailability between the sediments. Some of the results will be
discussed during the seminar.

Contact:  Dr. Peter Landrum, 734-741-2276 (landrum@glerl.noaa.gov)

Great Lakes Environmental Research Laboratory
National Oceanic and Atmospheric Administration
U.S. Department of Commerce
2205 Commonwealth Blvd.
Ann Arbor, Michigan 48105-1593
TEL  734-741-2235

http://www.glerl.noaa.gov/

--
**********
Renda S. Williams
Executive Secretary to the Director
Phone: 734-741-2245
Fax: 734-741-2003
E-Mail: williams@glerl.noaa.gov



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