Time-dependent retention of dichlorophenol and its polymerization products on soils

NUCL 15

Monica Palomo and Alok Bhandari. Department of Civil Engineering, Kansas State University, 2118 Fiedler Hall, Manhattan, KS 66506-5000
Horseradish peroxidase mediated oxidative polymerization has been proposed as a means to clean up phenol contaminated soils an

Horseradish peroxidase mediated oxidative polymerization has been proposed as a means to clean up phenol contaminated soils and groundwater. This study evaluated the retention and binding of 2,4-dicholorophenol (DCP) and its polymerization products generated in the presence of peroxidase on two soils. DCP and its polymerization products were equilibrated for soil-solute contact times ranging from 0.083 to 84 days at initial aqueous concentrations ranging from 5 to 500 μM.  14C-DCP was used to improve detection limits and track the contaminant in soil and solution. Extractability of the parent DCP and its polymerization products was evaluated by subjecting the soils to water and methanol extractions. 14C activities associated with the humic acid, fulvic acid and humin/mineral fractions were also quantified. Retention and binding behavior of DCP and its polymers was expressed in terms of sorption isotherms, the Extractability Index (EI), and time-dependant distributions of the contaminant among various soil components.