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Investigating Spectral Characteristics and Spatial Variability of Dissolved Organic Matter Leached from Wetland in Semi‐ A rid Region to Differentiate Its Sources and Fate
Author(s) -
Guo XuJing,
Li Qiang,
Jiang JinYuan,
Dai BenLin
Publication year - 2014
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201300412
Subject(s) - humus , environmental science , environmental chemistry , dissolved organic carbon , organic matter , wetland , pollution , arid , hydrology (agriculture) , soil science , chemistry , ecology , geology , soil water , geotechnical engineering , organic chemistry , biology
Dissolved organic matter (DOM) collected from different sampling sites in Lake Wuliangsuhai (Inner Mongolia Autonomous Region of China) was investigated using UV–Vis absorption and fluorescence spectroscopy. The three indices, SUVA 280 and two spectral slopes (S 275–295 and S 350–400 ), were used to detect the change in the aromatic structure of DOM. DOM aromaticity was lower at sites W1 and W3, where industrial wastewater and domestic sewage, and agricultural drainage, contributed respectively. The humification index also indicated a low humification degree at sites W1 and W3, and high humification degree in other sites with relatively better water quality. Fluorescence regional integration (FRI) analysis has been used to quantitatively analyse fluorescence excitation–emission matrix spectra. The results showed that external contaminants can influence the distribution of P i,n values from the FRI analysis. Serious pollution area obtained a relatively high P p value. A significant negative correlation between P h / P p and f 450/500 indicated the terrestrial or autochthonous sources of DOM. Therefore, the spectroscopic techniques combined with regional integration analysis can be used as a useful tool for investigating and assessing the lake ecological environment.