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Fluorescence characteristics of dissolved organic matter from dumped waste leachate |
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Abstract In order to reveal the characteristics of composition of leachates from dumped waste and their variations, three-dimensional excitation-emission matrix fluorescence spectroscopy (3DEEM) were applied for dissolved organic matter (DOM) of leachates extracted from four different dumped waste. Leachate sample S1 contained two different kinds of protein-like fluorescence peak, i.e., tyrosine-like and tryptophan-like fluorescence peaks. The other three samples (S2, S3 and S4), however, in addition to tryptophan-like fluorescence, contained humus-like fluorescence peaks as well, and the number, type and location of the peaks were different in according to samples. Leachate samples S1 contained only protein-like matter, while the other three samples contained both humus-like matter and protein-like matter, and the degree of humification of humus-like matter varied in different samples. The complexation between the protein-like matter in sample S1 and Hg (II) indicated that, compared with tryptophan-like fluorescence peak, tyrosine-like fluorescence peak could be more easily impacted by the micro-environmental change; the results of culture experiments at room temperature demonstrated that, protein-like substance could be easily broken, while humus-like substance shown strong resistance to microbe. 3DEEM could be effectively characterized the composition of DOM of leachates from dumped waste and their variations.
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Received: 14 October 2009
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