Impacts of land-use on surface waters at the watershed scale in southeastern China: Insight from fluorescence excitation-emission matrix and PARAFAC

Yang, Xueling; Yu, Xubiao; Cheng, Junrui; Zheng, Rong; Wang, Kan; Dai, Yuxing; Tong, Ningjun; Chow, Alex T.

doi:10.1016/j.scitotenv.2018.01.279

Cited by 36 publications

(10 citation statements)

References 63 publications

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“…Characterization of the DOM, such as excitation–emission matrix fluorescence spectra (e.g., Ohno, Amirbahman, & Bro, ) in rivers, could help apportion sources of that DOM and that could include sewage discharges. Indeed, Yang et al () showed that a protein‐like component identified from parallel factor analysis of excitation–emission matrix was correlated with urban DOM sources.…”

Section: Discussionmentioning

confidence: 93%

The importance of sewage effluent discharge in the export of dissolved organic carbon from U.K. rivers

Worrall

Howden

Burt³

et al. 2019

Hydrological Processes

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The flux of fluvial carbon from the terrestrial biosphere to the world's oceans is known to be an important component of the global carbon cycle, but within this pathway, the flux and return of carbon to the river network via sewage effluent has not been quantified. In this study, monitoring data from 2000 to 2016 for the dissolved organic carbon (DOC) concentration, biochemical oxygen demand, and chemical oxygen demand of the final effluent of sewage treatment works from across England were examined to assess the amount of DOC contributing to national‐scale fluvial fluxes of carbon. The study shows that the median concentration of DOC in final effluent was 9.4 compared with 4.8 mg C/L for all surface waters for the United Kingdom over the study period and that the DOC in final effluent significantly declined over the study period from 11.0 to 6.4 mg C/L. Rivers receiving sewage effluent showed a significant, on average 19%, increase in DOC concentration downstream of sewage discharges. At the scale of the United Kingdom, the flux of DOC in final effluent was 31 ktonnes C/year with a per capita export of 0.55 kg C/year and compared with an average annual flux of DOC from the United Kingdom of 859 ktonnes C/year, that is, only 3.6% of national‐scale flux. The lability of this DOC was limited, with only 7.4% loss of final effluent DOC concentration over in‐stream residence times of up to 5 days. The direct decline in DOC concentration from sewage treatment works was not large enough on its own to explain the declines observed in DOC concentration in U.K. rivers at their tidal limit.

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Section: Discussionmentioning

confidence: 93%

The importance of sewage effluent discharge in the export of dissolved organic carbon from U.K. rivers

Worrall

Howden

Burt³

et al. 2019

Hydrological Processes

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“…The spectral slope ratio (SR) was calculated by dividing the spectral slope S275-295 by the spectral slope S350-400. E2:E3 and SR were negatively correlated with the molecular size of DOM (Yang et al 2018).…”

Section: Collection and Analysis Of Water Samplesmentioning

confidence: 92%

“…In recent years, due to the continuous development of spectroscopy technology, EEM technology has been widely used in the study of the fluorescence characteristics of DOM in natural water due to its advantages of convenience and fast testing, fewer water samples required, and online monitoring (Yang et al 2018;Zhang et al 2021). However, EEM is usually composed of various types of overlapping fluorophores, and traditional 'peak-finding' methods cannot accurately reflect the dynamic changes of DOM (Ji et al 2019).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Optical property of dissolved organic matter and its correlation with heavy metals in surface water around metal mines to be exploited in southern Anhui Province, China

Feng

2022

Water Supply

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In this study, to clarify the optical characteristics of dissolved organic matter (DOM) in the surface water around the metal mine to be exploited and its relationship with heavy metals, 11 pond water samples and 21 river water samples were collected around the typical to be exploited metal mine in southern Anhui Province, China. The optical properties of DOM in surface water were studied by ultraviolet-visible (UV-Vis) spectroscopy and excitation-emission matrix (EEM) spectroscopy. Co-occurrence network analysis revealed the intrinsic relationship among UV-Vis spectral parameters, fluorescent components, and heavy metals. The results showed that the DOM in the river had higher content, but its molecular weight was smaller than in the pond. EEM coupled with parallel factor analysis (EEM- PARAFAC) revealed humic-like components (C1 and C2) and protein-like components (C3), and the average content of each fluorescent component in the river was higher than that in the pond. However, except for As, the average content of other heavy metals (Cr, Cu, Cd, Pb, and Zn) in ponds was more significant than in rivers. The co-occurrence network analysis result revealed that there might be different relationships between heavy metals and the DOM due to the various land-use.

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“…Protein-like components were typical indicators of anthropogenic emissions. It was usually used as an indicator of wastewater discharge and was greatly in uenced by human activities (Yang et al, 2018).…”

Section: Spatiotemporal Variations Of Dom Compositionmentioning

confidence: 99%

Spatiotemporal variations of DOM in a typical multi-source watershed in northern China: A fluorescent evidence

Jin

Lin

Liu

et al. 2021

Preprint

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Dissolved organic matter (DOM) in the multi-source watershed is of guiding significance for the comprehensive management and the assessment of sustainable safety of the watershed. We investigated the components and spectral characteristics of DOM in North Canal River as a typical multi-source watershed in northern China for the first time, using three-dimensional excitation-emission matrix and parallel factor analysis (PARAFAC). The relationship between DOM composition and water quality was also discussed. Results showed that the DOM in the North Canal River watershed was mainly composed of two similar humic acid-like components (230, 335/400nm and 260, 360/450nm) and a tryptophan-like component (280/290 ~ 350nm). The intensity of DOM shows obvious seasonal spatiotemporal variations. In terms of time, the relative concentration of DOM in winter is significantly higher than that in other seasons due to the influence of water volume, temperature, and photochemical degradation factors. As for the aspect of space, under the combined effect of land use and multiple sources of pollution, the relative concentration of tryptophan-like in the mainstream was significantly higher than tributaries, while the relative concentration of humic-like components in the tributaries was higher than that in the mainstream. In the North Canal River watershed, the primary sources of DOM are human-derived point sources and agricultural non-point sources in the mainstream, and terrestrial and microbial sources in the tributaries. Moreover, the composition of DOM is significantly related to water quality indicators, especially nitrogen and phosphorus, which shows that DOM can have an indicative impact on the trophic status in the North Canal River. The result of this study may provide an indicative effect and scientific basis for water quality monitoring and pollution controlling in the North Canal River watershed.

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Impacts of land-use on surface waters at the watershed scale in southeastern China: Insight from fluorescence excitation-emission matrix and PARAFAC

Cited by 36 publications

References 63 publications

The importance of sewage effluent discharge in the export of dissolved organic carbon from U.K. rivers

The importance of sewage effluent discharge in the export of dissolved organic carbon from U.K. rivers

Optical property of dissolved organic matter and its correlation with heavy metals in surface water around metal mines to be exploited in southern Anhui Province, China

Spatiotemporal variations of DOM in a typical multi-source watershed in northern China: A fluorescent evidence

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