期刊
CHEMOSPHERE
卷 93, 期 9, 页码 2208-2215出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2013.04.039
关键词
Dissolved organic matter; Excitation-emission matrix (EEM) spectra; Parallel factor analysis (PARAFAC); Fluorescence regional integration (FRI); Projection pursuit cluster (PPC) model
资金
- National Natural Science Foundation of China [51078340]
- National Public Benefit (Environmental) Research Foundation of China [201109009]
- China Postdoctoral Science Foundation [2012M520349]
- Fundamental Research Funds for the Central Public Research Institutes [2012GQ-14]
The present several humification indexes cannot provide the whole fluorescence information on organic matter composition and the evaluation results from them are inconsistent sometimes. In this study, fluorescence excitation-emission matrix spectra coupled with parallel factor analysis and fluorescence regional integration analysis were utilized to investigate organic matter humification, and the projection pursuit cluster (PPC) model was applied to form a suitable index for overcoming the difficulties in multi-index evaluation. The result showed that the ratio between the volume of humic- and fulvic-like fluorescence region and the volume of protein-like fluorescence region not only revealed the heterogeneity of organic matter, but also provided more accurate information on organic matter humification. In addition, the results showed that the PPC model could be used to characterize integrally the humification, and the projected characteristic value calculated from the PPC model could be used as the integrated humification evaluation index. (C) 2013 Elsevier Ltd. All rights reserved.
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