| Biology and Soil |
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| Effect of Heat Treatment on Fluorescence Properties of Humic Acids of Soil beside Desert and Their Cu(Ⅱ) Complexing Behavior |
| FU Qing-long1,2,3, PAN Xiang-liang1,2, ZHOU Bin1 |
1.State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
3.Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The changes in fluorescence properties of humic acids of soil from edge of the Taklimakan Desert under 80 ℃ heat treatment and their Cu(Ⅱ) complexing behavior were investigated through fluorescence spectroscopy. Results show that under heat treatment, a blue shift appears in the emission wavelength of fulvic-like substance; the fluorescence intensity and the Cu(Ⅱ) complexing conditional stability constants (lgKa) of fulvic-like substance and humic-like substance decrease; the Cu(Ⅱ) complexing constants (lgKb) of fulvic-like substance and humic-like substance increase; and the fluorophore and site number of humic acids involved in Cu(Ⅱ) complexing also increase. This study demonstrates that the structure and composition of humic acids might be modified by the high temperature in the arid desert zone and thus the transport behavior of Cu(Ⅱ) in soil is influenced.
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Received: 30 January 2012
Published: 20 September 2012
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2012, Vol. 32 
