CS13 Environmental Ecotoxicology
Date: Friday, June 14, 2002
Time: 8:30:00 AM
Location: Esquimalt
 
CurtisPJ, Okanagan University College, Kelowna, Canada, jcurtis@ouc.bc.ca
Playle, R, , Wilfred Laurier University, Waterloo, Canada, rplayle@wlu.ca
Luider, C, , University of Northern British Columbia, Prince George, Canada, 
 
SYSTEMATIC VARIABILITY IN QUALITATIVE PROPERTIES OF DOM: IMPLICATIONS FOR METAL BIOAVAILABILITY.
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DOM concentration and quality in surface waters depends on the loading of allochthonous and autochthonous DOM and on its residence time in surface waters. We sampled along a hydrologic gradient spanning more than 70 years of hydrologic residence time, to quantify changes in DOM qualitative properties. We compared these results with allochthonous and autochthonous end-members. In general, the quality of DOM at low water residence times was similar to allochthonous DOM. DOM quality increasingly resembled autochthonous DOM with increasing water residence time. Finally, we concentrated samples of DOM from each of the systems so that we could measure the complexation of hydrogen and copper ions (Luider et al. ASLO 2002), and determine the protective effects of DOM to organisms from Cu exposure (Playle et al. ASLO 2002).