title: [Parallel factor analysis for excitation emission matrix fluorescence spectroscopy of dissolved organic matter from a reservoir-type river].
abstract: The fluorescent components and their distribution and variation of dissolved organic matter (DOM) were examined using excitation emission matrix fluorescence spectroscopy-parallel factor analysis technique (EEMs-PARAFAC) for samples collected during June, 2008 from Minjiang River, a typical subtropical reservoir-type river ecosystem. Three separate fluorescent components were identified by PARAFAC, including two dominant humic-like components (C1: < 250, 325/424 nm; C2: 270, 395/482 nm) and one protein-like component (C3: < 250, 280/358 nm), of which humic-like components were dominant. Fluorescence analysis provided a 'fingerprint' technique to trace the mixing of DOM between three tributaries in the upstream of Minjiang River. The nearly constant concentration and composition in the main stream of Minjiang River reflected the effect of dam construction Correlation and principal component analysis (PCA) revealed that humic-like components were principally derived from flushing of watershed soils, while protein-like component was formed from in-situ production which could be used as a proxy of the concentration of total dissolved nitrogen (TDN). Multi-linear regression of fluorescent components C2 and C3 can be used to trace the variation of dissolved organic carbon (DOC) concentration. This study demonstrates that Minjiang is a typical subtropical reservoir-type river which still keeps relatively 'unpolluted' aquatic environment.
authors.affiliation: State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China. wdguo@xmu.edu.cn
authors.forename: Wei-Dong
authors.initials: WD
authors.lastname: Guo
authors.forename: Li-Yang
authors.initials: LY
authors.lastname: Yang
authors.forename: Fu-Li
authors.initials: FL
authors.lastname: Wang
authors.forename: Wen-Zhao
authors.initials: WZ
authors.lastname: Chen
authors.forename: Xin-Hong
authors.initials: XH
authors.lastname: Wang
authors.forename: Hua-Sheng
authors.initials: HS
authors.lastname: Hong
mesh_terms: D005163:Factor Analysis, Statistical; D009930:Organic Chemicals / Q000032:analysis*; D045483:Rivers / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D009930:Organic Chemicals