Sanpawanitchakit, C. Colorado School of Mines, 303-384-9105
Honeyman, B. Colorado School of Mines, csanpawa@mines.edu

 
A STUDY OF THE ROLE OF NOM IN TRACE METAL FLUX FROM SEDIMENTS USING A BENCH-SCALE BENTHIC CHAMBER.
 
Accurate simulation of metal flux from sediments containing natural organic matter (NOM) requires knowledge of several processes, including: metal/NOM binding, the transport of NOM within the sediment matrix, the interaction of NOM/metal complexes with the sediment and solute mass transfer across the sediment/water diffusive boundary layer. Our experimental system includes a bench-top reactor with a spinning disk to impart a constant sediment/water shear stress, purified quartz sand and NOM from several different sources. Metal ions included uranium (VI) an ddacmium (II). System hydrodynamics was calibrated through alabaster plate dissolution and use of tritiated water as a conservative tracer. Results show that metal flux is regulated by the physico-chemical properties of the metal/NOM complex and the structure of the boundary later.
 
Day: Friday, Feb. 5
Time: 02:45 - 03:00pm
Location: Sweeney Center
 
Code: CS63FR0245S