Niu Cheng, Zhang Yunlin, Zhou Yongqiang, Shi Kun, Liu Xiaohan, Qin Boqiang
Taihu Lake Laboratory Ecosystem Research Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Sensors (Basel). 2014 Jun 30;14(7):11580-94. doi: 10.3390/s140711580.
This study presents results from field surveys performed over various seasons in a large, eutrophic, shallow lake (Lake Taihu, China) using an in situ chromophoric dissolved organic matter (CDOM) fluorescence sensor as a surrogate for other water quality parameters. These measurements identified highly significant empirical relationships between CDOM concentration measured using the in situ fluorescence sensor and CDOM absorption, fluorescence, dissolved organic carbon (DOC), chemical oxygen demand (COD) and total phosphorus (TP) concentrations. CDOM concentration expressed in quinine sulfate equivalent units, was highly correlated with the CDOM absorption coefficient (r(2) = 0.80, p < 0.001), fluorescence intensities (Ex./Em. 370/460 nm) (r(2) = 0.91, p < 0.001), the fluorescence index (r(2) = 0.88, p < 0.001) and the humification index (r(2) = 0.78, p < 0.001), suggesting that CDOM concentration measured using the in situ fluorescence sensor could act as a substitute for the CDOM absorption coefficient and fluorescence measured in the laboratory. Similarly, CDOM concentration was highly correlated with DOC concentration (r(2) = 0.68, p < 0.001), indicating that in situ CDOM fluorescence sensor measurements could be a proxy for DOC concentration. In addition, significant positive correlations were found between laboratory CDOM absorption coefficients and COD (r(2) = 0.83, p < 0.001), TP (r(2) = 0.82, p < 0.001) concentrations, suggesting a potential further application for the real-time monitoring of water quality using an in situ CDOM fluorescence sensor.
本研究展示了在中国大型富营养化浅水湖泊（太湖）不同季节进行的实地调查结果，该调查使用原位发色溶解有机物（CDOM）荧光传感器替代其他水质参数。这些测量确定了使用原位荧光传感器测量的CDOM浓度与CDOM吸收、荧光、溶解有机碳（DOC）、化学需氧量（COD）和总磷（TP）浓度之间高度显著的经验关系。以硫酸奎宁当量单位表示的CDOM浓度与CDOM吸收系数（r(2) = 0.80，p < 0.001）、荧光强度（激发/发射波长370/460 nm）（r(2) = 0.91，p < 0.001）、荧光指数（r(2) = 0.88，p < 0.001）和腐殖化指数（r(2) = 0.78，p < 0.001）高度相关，这表明使用原位荧光传感器测量的CDOM浓度可替代实验室测量的CDOM吸收系数和荧光。同样，CDOM浓度与DOC浓度高度相关（r(2) = 0.68，p < 0.001），表明原位CDOM荧光传感器测量结果可作为DOC浓度的替代指标。此外，实验室CDOM吸收系数与COD（r(2) = 0.83，p < 0.001）、TP（r(2) = 0.82，p < 0.001）浓度之间存在显著正相关，这表明原位CDOM荧光传感器在水质实时监测方面具有潜在的进一步应用价值。
