Spectral characteristic of dissolved organic matter (DOM) in the surface sediments from different discharging points along the Nanfei River in Hefei City, Anhui Province
Abstract：The surface sediments samples were collected from 15 discharge ports of Nanfei River, an urban river in Hefei, Anhui Province. The fluorescence components and the sources of dissolved organic matter (DOM) in sediments were analyzed by the uses of dissolved organic carbon (SDOC) measurement, ultraviolet-visible absorption spectrum, and three-dimensional excitation emission matrix fluorescence spectroscopy (3D-EEM) combined with parallel factor analysis (PARAFCT). The results showed that the contents of SDOC ranged from 0.28to 0.95g/kg with the average of 0.63g/kg. The contents of SDOC in the old town were observed significantly higher than others, especially for the discharging ports near sewage plant effluents. It was found that the UV-Visible absorption coefficient (aλ) reflected well the relative quantity of DOM extracted from the sediments. The spectral slop (S) and the spectral slope ratio (SR) could be used to distinguish the difference in chemical composition of sediment DOM from different discharging ports. Further 3D-EEM analysis and PARAFAC mode studies revealed that there were four fluorescence components, and the autochthonous fractions including C2and C4components were the main sources of sediment DOM. It seems that there existed significant difference in the sources of sediment DOM from different discharging ports, and the sediment DOM of discharging ports from old town mainly originated from autochthonous production, while DOM of the sediment samples from upstream of Nanfei River showed significantly higher terrestrial source than that of the other samples. This study indicates that the spectrum analysis can be a useful tool to characterize the pollution intensity and discharging sources into the urban river.
沈烁, 王育来, 杨长明, 杨殿海. 南淝河不同排口表层沉积物DOM光谱特征[J]. 中国环境科学, 2014, 34(9): 2351-2361.
SHEN Shuo, WANG Yu-Lai, YANG Chang-Ming, YANG Dian-Hai. Spectral characteristic of dissolved organic matter (DOM) in the surface sediments from different discharging points along the Nanfei River in Hefei City, Anhui Province. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(9): 2351-2361.
