NDLI: Characterization of the composition of water DOM in a surface flow constructed wetland using fluorescence spectroscopy coupled with derivative and PARAFAC

Content Provider	Springer Nature Link
Author	Zhi, Erquan Yu, Huibin Duan, Liang Han, Lu Liu, Li Song, Yonghui
Copyright Year	2015
Abstract	This study was conducted to discuss fluorescence spectroscopic properties of water dissolved organic matter (DOM) in a large-scale constructed wetland and to reveal the composition and humification degree. Four humification indices (HIXs) deduced from emission spectra (A $_{4}$/A $_{1}$), excitation spectra (I $_{426}$/I $_{366}$), synchronous fluorescence spectra (I $_{370}$/I $_{330}$) and derivative (I $_{360}$/I $_{320}$) were used for the description of composition and humification degree of DOM. Three components (C1–C3) were derived from excitation-emission matrices with parallel factor analysis (PARAFAC). The results showed that dissolved organic carbon (DOC), total nitrogen (TN) and total phosphorus (TP) concentrations in tributaries water decreased when they flowed through the constructed wetland. The values of A $_{4}$/A $_{1}$, I $_{426}$/I $_{366}$, I $_{370}$/I $_{330}$ and I $_{360}$/I $_{320}$ suggested that the DOM consisted of organic components with low molecular weight and low aromatic contents in the tributary. I $_{360}$/I $_{320}$ could differentiate humification degree more clearly than the other three HIXs. The fluorescence index indicated a more microbially derived composition of DOM in the constructed wetland. The DOM fluorescence was dominated by the tryptophan-like fluorescence material (C3, more than 40 %), followed by humic-like substance (C1, about 30 %). Non-humic component (C2, about 20 %) was the least component. The percentage of C1 declined from upstream to downstream along the wetland, while C3 showed inverse tendency. The proportion of C2 remained relatively constant in all sampling points. Principal component analysis suggested that the humification degree of the DOM in the slowly flowing region was the highest among the wetlands, followed by those from the regions disturbed by tributaries, the sampling sites in mainstream and the outlet zone of wetland. The humification degree also showed a good correlation mainly with TN, TP and Chlorophyll a. Therefore, fluorescence spectroscopy technique coupled with derivative and PARAFAC might be a useful method to investigate composition and to evaluate the humification degree of DOM in aquatic environment.
Starting Page	5153
Ending Page	5161
Page Count	9
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-02-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dissolved organic matter Fluorescence spectra Derivative synchronous fluorescence Parallel factor analysis Constructed wetland Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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