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Treatment of 2,4-Dichlorophenol Polluted Soil with Free and Immobilized Laccase

^a Laboratory of Soil Biochemistry, The Pennsylvania State University, 129 Land and Water, University Park, PA 16802
^b Dep. of Agricultural Chemistry, Kyungpook National University, Taegu, 702-701, Korea

View larger version (16K): [in a new window]   Fig. 1. Activity (% of initially added; 3800 unit g-1) of free or immobilized laccase of Trametes villosa in soils under 55% of maximum water-holding capacity (WHC) moisture condition, as determined by a biological oxygen monitor with 2,6-dimethoxyphenol as substrate. The standard error (SE) for activity (%) ranged between 0.1 and 2.3.

View larger version (22K): [in a new window]   Fig. 2. Disappearance of 2,4-DCP (measured by high-performance liquid chromatography, HPLC) following the treatment of 14C-2,4-DCP-polluted Soils 1 and 2 with free or immobilized laccase of Trametes villosa (3800 unit g-1) under different moisture conditions (30, 55, and 100% of maximum water-holding capacity, WHC). The standard error for 2,4-DCP (%) ranged between 0.1 and 3.5.

View larger version (49K): [in a new window]   Fig. 3. Binding of radioactivity following the treatment of 14C-2,4-DCP-polluted Soils 1 and 2 with free or immobilized laccase of Trametes villosa (3800 unit g-1) under different moisture conditions (30, 55, or 100% of maximum water-holding capacity, WHC). The SE for radioactivity (%) ranged between 0.1 and 4.0. A * indicates controls obtained by treating the 14C-2,4-DCP-polluted soils with Milli-Q water or montmorillonite without the enzyme.

View larger version (39K): [in a new window]   Fig. 4. Binding of radioactivity following the treatment of 14C-2,4-DCP-polluted Soils 1 and 2 with different amounts of free or immobilized laccase of Trametes villosa under 55% of maximum water-holding capacity (WHC) moisture condition. The standard error for radioactivity (%) ranged between 0.1 and 4.0. A * indicates original enzyme activity applied for immobilization.