Citation: Chen Zijian, Huang Guocheng, Meng Fangang. Photochemical Degradation of the Size-Fractionated Dissolved Organic Matter[J]. Chemistry, ;2018, 81(3): 236-240. shu

Photochemical Degradation of the Size-Fractionated Dissolved Organic Matter

School of Environmental Science and Engineering, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275

Corresponding author: Meng Fangang, mengfg@mail.sysu.edu.cn
Received Date: 5 July 2017
Accepted Date: 18 December 2017

Figures(2)

In this study, the photo degradation of the size-fractionated (0.45μm-100kDa, 100kDa-5kDa, < 5kDa) dissolved organic matter (DOM) at different light sources was investigated. Measurements of dissolved organic carbon (DOC) and UV₂₅₄ absorbance showed that sunlight exposure led to the decrease of DOM in all the three fractions over a 6-days period of 6 h/d irradiation, and the presence of UVC light in natural sunlight can speedup DOM elimination. The parallel factor (PARAFAC) analysis of fluorescence excitation emission matrices (EEM) revealed the presence of three humic-like components (C1:UVA+UVC; C2:UVA+UVB; C3:UVC) in the DOM samples. In addition, the fluorescent components in large-size DOM fractions (>5kDa) were not sensitive to sunlight exposure, and some of which increased upon sunlight exposure. However, the C1 and C2 in the small-size DOM fractions (< 5kDa) were much more susceptible to sunlight exposure, both of which decreased significantly after the 6-days incubation. But, the C3 components in all DOM fractions were found to be photo-produced. Also, the presence of the UVC light in sunlight can somewhat speedup the elimination of C1 and C2 or decrease the generation of C3.
- Natural organic matter,
- Fluorescence spectra,
- Parallel factor analysis,
- Photodegradation,
- Light source
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