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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2015, Vol. 9 Issue (4) : 575-582     https://doi.org/10.1007/s11783-014-0664-y
RESEARCH ARTICLE
Photodegradation of chromophoric dissolved organic matters in the water of Lake Dianchi, China
Yuan ZHANG1,2,Chunming HU1,2,Tao YU1,2,*()
1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2. Laboratory of Riverine Ecological Conservation and Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Abstract

Water samples were taken from Lake Dianchi, on the Yungui Plateau of southwest China, and experiments were conducted to simulate the photochemical degradation characteristic of chromophoric dissolved organic matter (CDOM) in the lake water. Three groups of experiments under different light conditions: ultraviolet (UV) light, visible light, and dark, were done and variations of fluorescence properties, UV absorbance, and dissolved organic carbon (DOC) concentrations during the experiments were analyzed to study the photodegradation process of CDOM with time. The result showed that light irradiation led to significant photochemical degradation of CDOM, resulting in changes in florescent properties, absorbance losses, decreases in aromaticity and average molecular weight, as well as decline in DOC concentration in the water. It was also observed that UV irradiation had greater effect than visible light did. However, various fluorophores had different sensitivities to the same irradiation condition, that is, protein-like fluorophore at the low excitation wavelengths is more sensitive to UV irradiation than the other fluorophores, and is more readily to undergo photo-degradation. In addition, visible light irradiation did not have significant impact on DOC in the water, with DOC concentration decrease by 5.57% –59.9% during the experiment time. These results may provide new knowledge on the environment behavior of CDOM in the water of Lake Dianchi.

Keywords chromophoric dissolved organic matter      photodegradation      ultraviolet radiation      dissolved organic carbon     
Corresponding Author(s): Tao YU   
Online First Date: 18 March 2014    Issue Date: 25 June 2015
 Cite this article:   
Yuan ZHANG,Chunming HU,Tao YU. Photodegradation of chromophoric dissolved organic matters in the water of Lake Dianchi, China[J]. Front. Environ. Sci. Eng., 2015, 9(4): 575-582.
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http://journal.hep.com.cn/fese/EN/10.1007/s11783-014-0664-y
http://journal.hep.com.cn/fese/EN/Y2015/V9/I4/575
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Fig.1  Sampling sites for Lake Dianchi
temperature/°C pH DO/ (mg·L-1) conductivity/(s·cm-1) DOC/(mg·L-1)
18.9 8.5 6.62 373 48.1
Tab.1  Basic characteristics of the mixed water sample from Lake Dianchi
Fig.2  Contour map obtained from the 3DEEMs of CDOM in the original water sample. Note: A, B, C, and D are florescent peaks, in which peak A: Ex/Em= 250-255nm/450-460nm; peak B: Ex/Em= 270- 290 nm/320-350 nm; peak C: Ex/Em=310-330 nm/ 410-450 nm; and peak D: Ex/Em= 220-230 nm/320-350 nm
Fig.3  Changes of fluorescence peak intensities with time for the three groups (a) UV radiation (b) visible light (c) in dark
Fig.4  Changes of r (A, C) values with time for the three groups
Fig.5  Changes of a(280) values with time for the three groups
Fig.6  Changes of a(250)/ a(365) values with time for the three groups
Fig.7  Changes of DOC concentrations with time for the three groups
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