Authors: Hongyang Cui Jianhong Shi Linlin Qiu Yue Zhao Zimin Wei Xinglei Wang Liming Jia Jiming Li
Publish Date: 2016/02/11
Volume: 23, Issue: 10, Pages: 10058-10071
Abstract
Chromophoric dissolved organic matter CDOM is an important optically active substance that can transports nutrients and pollutants from terrestrial to aquatic systems Additionally it is used as a measure of water quality To investigate the source and composition of CDOM we used chemical and fluorescent analyses to characterize CDOM in Heilongjiang The composition of CDOM can be investigated by excitationemission matrix EEM fluorescence and parallel factor analysis PARAFAC PARAFAC identified four individual components that were attributed to microbial humiclike C1 and terrestrial humiclike C2–4 in water samples collected from the Heilongjiang River The relationships between the maximum fluorescence intensities of the four PARAFAC components and the water quality parameters indicate that the dynamic of the four components is related to nutrients in the Heilongjiang River The relationships between the fluorescence component C3 and the biochemical oxygen demand BOD5 indicates that component C3 makes a great contribution to BOD5 and it can be used as a carbon source for microbes in the Heilongjiang River Furthermore the relationships between component C3 the particulate organic carbon POC and the chemical oxygen demand CODMn show that component C3 and POC make great contributions to BOD5 and CODMn The use of these indexes along with PARAFAC results would be of help to characterize the covariation between the CDOM and water quality parameters in the Heilongjiang RiverThis work was financially supported by the Major Projects on Control and Rectification of Water Body Pollution 2009ZX07106001 the National environmental monitoring and information 2111101 and the National Natural Science Foundation of China no 51378097
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