Abstract:To illuminate the distribution characteristics and environmental influences of dissolved organic matter (DOM) in groundwater, the source, spatial and temporal distribution characteristics of DOM were studied by fluorescence excitation-emission matrix spectra (EEM) combined with parallel factor (PARAFAC) analysis, and the influence of DOM on the distribution of inorganic salts was investigated as well. The results showed that the groundwater DOM was mainly microbial-derived. Four florescence components were identified by EEM spectra coupled with PARAFAC analysis, and components 1 and 3 originated from protein-like materials, while components 2 and 4 were ascribed to humic-like substances. The protein-like components had different sources and their composition was variable and changed with time, i.e., the concentration of them was higher in the summer and fall but lower in the winter and spring. On the other hand, the humic-like components had a similar source, and their composition was stable and showed no obvious change with season. The DOM, especially the protein-like components, was a source of ammonia nitrogen, and had an important influence on the groundwater pH value. The results demonstrated that, EEM spectra coupled with PARAFAC and principle component analysis can be used to analyze the composition and seasonal variation of the DOM in groundwater.
何小松, 席北斗, 张鹏, 高如泰, 李丹, 张慧. 地下水中溶解性有机物的季节变化特征及成因[J]. 中国环境科学, 2015, 35(3): 862-870.
HE Xiao-Song, XI Bei-Dou, ZHANG Peng, GAO Ru-Tai, LI Dan, ZHANG Hui. The seasonal distribution characteristics and its reasons of dissolved organic matter in groundwater. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(3): 862-870.