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Effect of Dissolved Organic Matter from Sludge and Sludge Compost on Soil Copper Sorption

^a College of Resources and Environmental Sciences, Nanjing Agricultural Univ., Nanjing 210095, P.R. China
^b Dep. of Biology, Hong Kong Baptist Univ., Kowloon Tong, Hong Kong SAR, P.R. China

View larger version (25K): [in a new window]   Fig. 1. Copper sorption isotherm of the acidic (A) and calcareous (C) soils with and without the addition of 400 mg C L-1 of the sludge or sludge compost dissolved organic matter (DOM).

View larger version (23K): [in a new window]   Fig. 2. Effect of concentration of dissolved organic matter (DOM) derived from sludge (S) and sludge compost (P) on the Cu sorption onto the acidic (A) and calcareous (C) soils with an initial Cu concentration of 40 mg L-1.

View larger version (21K): [in a new window]   Fig. 3. Desorption of Cu sorbed under the addition of various dissolved organic matter (DOM) concentrations and with an initial Cu concentration of 40 mg L-1 by the calcareous clay loam through 1 M MgCl2 (pH7) extraction for 2 h.

View larger version (16K): [in a new window]   Fig. 4. Effect of pH on Cu sorption onto the acidic (A) and calcareous (C) soils with or without the addition of 300 mg C L-1 of sludge dissolved organic matter (DOM).