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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (08): 960-966. 上一篇    下一篇

研究论文

三峡水库溶解有机质的三维荧光光谱研究

虞丹尼1，周光明*,1，吉芳英2，黎司2，杨大成1，王图锦2，曹琳2   

  1. (1西南大学化学化工学院 重庆 400715)
    (2重庆大学 三峡库区生态环境教育部重点实验室 重庆 400030)
  • 投稿日期:2010-08-28 修回日期:2010-11-17 发布日期:2010-12-22
  • 通讯作者: 黎司 E-mail:lisi80@126.com
  • 基金资助:

    科技部中德合作项目;教育部科技创新重大项目培育资金.

Research on Fluorescence Excitation Emission Matrix of Dissolved Organic Matters from the Three Gorges Reservoir

Yu Danni1 Zhou Guangming*,1 Ji Fangying2 Li Si2 Yang Dacheng1 Wang Tujin2 Cao Lin2   

  1. (1 School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715)
    (2 Key Laboratory of the Three Gorges Reservoir Region s Eco-environment, Ministry of Education, Chongqing University, Chongqing 400030)
  • Received:2010-08-28 Revised:2010-11-17 Published:2010-12-22

PDF

1469

被引次数

28

在三峡水库首次蓄水175 m最高水位及其消落至145 m最低水位期间, 分别采集三峡水库 8个段面的水样, 应用三维荧光光谱(EEM)研究了三峡水库中溶解有机质(DOM), 考察了DOM在整个三峡水库的组成、分布及其来源, 着重探讨了30 m水位消落对DOM的影响, 并拟合了DOM中各荧光峰强的比值变化及其与pH、溶解氧(DO)、溶解有机碳(DOC)、氧化还原电位(ORP)等环境因子的线性关系. 结果显示, 水库干流DOM的EEM均表现出4个荧光峰, 归属为类蛋白质、类腐殖酸、类富里酸. 最高水位时, 从三峡水库上游至下游, 荧光峰强逐渐增强, 在大坝前最强|最低水位时, 荧光峰强较其高水位均显著提高, 受丰水期沿岸不同的陆源汇流影响, 最强荧光峰出现在三峡水库中、上游. 各荧光峰强与环境因子的线性关系在枯水期高水位时较好, 在丰水期低水位时仅有DO与类蛋白有正相关性. 揭示了三峡水库水质主要受丰水期的陆源汇流影响, 而大坝运行模式的影响不显著.

关键词: 三峡水库, 水位消落, 溶解有机质, 三维荧光光谱

Fluorescence excitation emission matrix (EEM) are applied to characterize the dissolved organic matter (DOM) from waters in the Three Gorges Reservoir, sampled at near the highest water level 175 m for the first time and followed drawdown to the lowest water level 145 m respectively. The composition, distribution and source of the DOM in the Three Gorges Reservoir are investigated with impacted by 30 m water levels fluctuation, and the correlations between each fluorophore s intensity and environmental factors such as pH, DO (dissolved oxygen), DOC (dissolved organic carbon), ORP (oxidation- reduction potential) etc. are fitted. From the results, all the DOM s EEM from main streams in the Three Gorges Reservoir had four fluorescence peaks, attributed to protein-like, humic-like and fulvic-like respectively. During 175 m dry season, fluorescence intensities in EEMs increased from upstream to downstream, with the Dam section having the strongest intensity|comparatively, during 145 m wet season, the fluorescence intensities was obviously higher than those in dry season, impacted by terrestrial confluence along the bank of the Three Gorges Reservoir, and the strongest intensity occurred in the middle and upper reaches. A good correlation between environmental parameters and EEM Peaks was observed in dry season. On the contrary, only Peak A and DO has positive linear correlation during wet season. The present article revealed that the water quality in the Three Gorges Reservoir is mainly affected by the terrestrial confluence, with less impact by the 30 m water level fluctuation in reverse way to the Yangtze River s natural wet-dry law.

Key words: the Three Gorges Reservoir, water level fluctuation, dissolved organic matter, fluorescence excitation emission matrix