Evolution of Dissolved Organic Matter Properties in a Constructed Wetland of Xiao River, Hebei

• Published in: Guang pu xue yu guang pu fen xi Vol. 36; no. 1; p. 206
• Main Authors: Ma, Li-na, Zhang, Hui, Tan, Wen-bing, Yu, Min-da, Huang, Zhi-gang, Gao, Ru-tai, Xi, Bei-dou, He, Xiao-song
• Format: Journal Article
• Language: Chinese
• Published: China 01.01.2016
• ISSN: 1000-0593
• DOI: 10.3964/j.issn.1000-0593(2016)01-0206-07

The evolution of water DOC and COD, and the source, chemical structure, humification degree and redox of dissolved organic matter (DOM) in a constructed wetland of Xiao River, Hebei, was investigated by 3D excitation--emission matrix fluorescence spectroscopy coupled with ultraviolet spectroscopy and chemical reduction, in order to explore the geochemical processes and environmental effects of DOM. Although DOC contributes at least 60% to COD, its decrease in the constructed wetland is mainly caused by the more extensive degradation of elements N, H, S, and P than C in DOM, and 65% is contributed from the former. DOM is mainly consisted of microbial products based on proxies f470/520 and BIX, indicating that DOM in water is apparently affected by microbial degradation. The result based on PARAFAC model shows that DOM in the constructed wetland contains protein-like and humus-like components, and Fulvic- and humic-like components are relatively easier to degrade than protein-like components. Fulvic- and humic-