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| Fractionation and characterization of dissolved organic matter derived from different organic material commonly applied in agriculture |
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Abstract Since environmental behavior and effect of dissolved organic matter depend mainly on its physicochemical properties, a series of physicochemical and spectroscopic experiments was employed to investigate fractionation and characterization of dissolved organic matter (DOM) derived from pig manure, sewage sludge and green manure, commonly applied in agriculture. The contents of DOM were 122, 23793, 12904 and 380560 mg C/kg for paddy soil, sewage sludge, pig manure and green manure, respectively. On the basis of the content of high molecule fraction, the DOM could be arranged in the following order: paddy soil (51.08%)>pig manure (41.25%)>sewage sludge (23.33%)>green manure (7.36%). The tendency in content of polar fraction was reverse, i.e., paddy soil (10.71%)pig manure DOM(1.12)>sewage sludge DOM(1.11)>green manure DOM(0.98), and UV spectra of DOM further confirmed the order.
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Received: 13 October 2009
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