Identifying the sources and fate of anthropogenically impacted dissolved organic matter (DOM) in urbanized rivers

Meng, Fangang; Huang, Guocheng; Yang, Xin; Li, Zengquan; Li, Jian; Cao, Jian; Wang, Zhi Gang; Sun, Lin

doi:10.1016/j.watres.2013.05.043

Cited by 189 publications

(94 citation statements)

References 51 publications

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“…In addition, the F max of C3 and C4 also exhibited greater values in the residential area than in the upstream sampling sites. Thus, the anthropogenic activities could also lead to the input of terrestrial humic-like substances [28]. As there were no significant seasonal differences in F max , the hydrological processes presumed not to affect the distribution of DOM components.…”

Section: Cluster Analysis Resultsmentioning

confidence: 94%

“…As there were no significant seasonal differences in F max , the hydrological processes presumed not to affect the distribution of DOM components. The seasonal variability of DOM likely resulted from a number of factors such as rainfall, photodegradation, and microbial uptake [28]. Photodegradation and microbial uptake of DOM could be elevated during the summer, which might change the composition of DOM.…”

Section: Cluster Analysis Resultsmentioning

confidence: 99%

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Effects of Land Use on the Amount and Composition of Dissolved Organic Matter in a Chinese Headwater Stream Watershed

Xu¹,

Huang²,

Li³

et al. 2016

Pol. J. Environ. Stud.

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The source and composition of dissolved organic matter (DOM) are important drivers of its biogeochemical role in aquatic environments. Different land use types may alter DOM amount and composition in freshwaters. Here, water samples were collected from the outlets of 16 subcatchments within mixed land use patterns in the South Tiaoxi River in Eastern China. Dissolved organic carbon (DOC), DOM absorption coefficient (α 350 ), and fluorescence spectrum were measured. These 16 subcatchments were grouped into four clusters with different land use features: natural forest land, planted forest land (Phyllostachys praecox, a bamboo species), cropland, and residential land. Two humic-like and two protein-like fluorescent components were identified using parallel factor analysis (PARAFAC). DOC concentrations were the lowest in natural forest land dominated subcatchments as compared to other land uses with intensive anthropogenic activities, so did α 350 and fluorescent intensities of different components. Protein-like fluorescence was more pronounced for the subcatchments dominated by residential land, while terrestrial humic-like fluorescence was the most abundant component for the subcatchments dominated by the other three land use types. The relationships between the percentage of cropland and that of fluorescence fraction appear to be a threshold response, indicating that effects on DOM composition varied with agricultural activity patterns. The reservoir would have a positive effect on DOM amount and the percentage of protein-like fluorescence associated with autochthonous activities. This study in general shows the impact of anthropogenic land use patterns on the amount and composition of DOM in headwater streams, which may affect ecosystem function and health of aquatic environments.

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Section: Cluster Analysis Resultsmentioning

confidence: 94%

Section: Cluster Analysis Resultsmentioning

confidence: 99%

Effects of Land Use on the Amount and Composition of Dissolved Organic Matter in a Chinese Headwater Stream Watershed

Xu¹,

Huang²,

Li³

et al. 2016

Pol. J. Environ. Stud.

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“…However, many researchers have used optical methods, such as fluorescence spectroscopy and ultraviolet-visible absorption, which were also used in the qualitative characterization of organic matter in water bodies such as lakes and reservoirs (NGUYEN;HUR, 2011;HESTIR et al, 2015), regions with strong presence of urbanization (HUR; KONG, 2008;LOPARDO;AZEVEDO, 2008;SANTOS et al, 2011;BEM et al, 2013;MENG et al, 2013;DONG et al, 2014;KNAPIK;AZEVEDO, 2014;YU et al, 2015) and oceanic regions (DANG et al, 2014;YAMASHITA et al, 2015). Additionally, researchers have performed comparisons between water bodies' characteristics in different aquatic (WEISHAAR et al, 2003) environments.…”

Section: Introductionmentioning

confidence: 99%

Quali-quantitative characterization of organic matter in urbanized drainage basins as a basis for the application of Water Resources Management Instruments

Leithold

Fernandes

Knapik

et al. 2017

RBRH

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The challenge imposed by law no. 9433/97 to establish mechanisms for the recovery of bodies of water led to a dynamic of research that could guarantee not only an adequate understanding of the management instruments but also the technical basis for their application. In this research, emphasis was placed on understanding the dynamics of organic matter (OM) in a drainage basin heavily influenced by anthropogenic activities, through the analysis and interpretation of qualitative and quantitative information. The case study was the Iguaçu River basin, from its headwaters in the Metropolitan Region of Curitiba (MRC) to the municipality of União da Vitória . The results obtained showed a large deposition of labile OM in the MRC coming probably from domestic effluents, with consequent DO depletion and water quality degradation. However, after the more urbanized region, there is a reduction in the concentration of OM and the indication of the predominance of pedogenic material, suggesting that in addition to the dilution effect, there is less input of anthropogenic effluents in this region, which results in an improvement in water quality, represented mainly by the recovery of the DO concentration. The combined use of quantitative data and UV-visible spectroscopy was fundamental to comprehend the variation in the characteristics of OM and its sources along the studied section.Keywords: Water quality; UV-Visible; Urban basins; Iguaçu River. RESUMOO desafio imposto pela lei n. 9433/97 de estabelecer mecanismos de recuperação de corpos hídricos induziu a uma dinâmica de pesquisas que pudessem garantir, não só o adequado entendimento dos instrumentos de gestão, mas a fundamentação técnica necessária à sua aplicação. Nesta pesquisa, ênfase foi dada na compreensão da dinâmica da MO em bacia hidrográfica fortemente influenciada pelas atividades antrópicas, através da análise e interpretação conjunta de informações qualitativas e quantitativas. O estudo de caso abordado foi a bacia do rio Rio Iguaçu e os resultados obtidos demonstraram grande aporte de MO lábil na RMC proveniente provavelmente de efluentes domésticos, com consequente depleção do OD e degradação da qualidade das águas. No entanto, após a região mais urbanizada há redução da concentração de MO e a indicação da predominância de material pedogênico, sugerindo que além do efeito de diluição, há menor aporte de efluentes antrópicos nesta região, o que resulta numa melhoria da qualidade das águas, representada principalmente pela recuperação da concentração do OD. A utilização conjunta dos dados quantitativos e da espectroscopia de UV-visível foi fundamental para compreender a variação nas características da MO e de suas fontes ao longo do trecho estudado. Palavras-Chave:Qualidade da água; Uv-Visível; Bacias urbanas; Rio Iguaçu.

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“…NOM can generally be divided into two components, namely, hydrophobic or humic substances (HS) and hydrophilic or non-humic substances (non-HS) (Scapini et al, 2013). The specific ultraviolet absorbance at 254 nm (SUVA -254) technique is used to identify whether the water contains HS or non-HS (Hur et al, 2011;Meng et al, 2013;Nkambule et al, 2012;Zazouli et al, 2007). SUVA is calculated as follows (Nkambule et al, 2012;Selburg et al, 2011):…”

Section: Introductionmentioning

confidence: 99%

A study of seasonal effects on metal-NOM interactions and the impact of CaCO<sup>3</sup> precipitation potentials using Visual MINTEQ, in raw and cooling water

Parshotam¹,

Gericke²,

Ngila³

et al. 2016

WSA

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This paper reports on a study of calcium carbonate (CaCO 3 ) precipitation potentials of cooling water (CW) at Eskom power stations. It is important to understand the complexation reaction between calcium and dissolved organic carbon (Ca-DOC) because the natural organic matter (NOM) affects the precipitation potentials of CaCO 3 . Secondly, it is necessary to understand the nature of the organic matter in the cooling and raw water. This study was carried out in raw and cooling water samples collected from Lethabo and Kriel power stations. These power stations obtain their cooling water from the Vaal River and Usuthu schemes, respectively. The DOC concentration in both water systems was higher in winter (little/no rainfall) as compared to spring (more rainfall). Specific ultraviolet absorption (SUVA) was calculated for the raw and cooling water for both stations. The SUVA results obtained for the raw water (RW) indicated that the NOM had a high degree of aromaticity (humic substances), whereas for the recycled CW the NOM present was found to be less aromatic. The Visual MINTEQ data for the winter sampling indicated that both Lethabo and Kriel were supplied by raw water that was under-saturated with respect to CaCO 3 , with saturation indices (SI) of −0.29 and −0.43, respectively. In addition, the % Ca-DOC in the raw water at Lethabo was 2.01 compared to 3.08 in the raw water at the Kriel plant. Therefore this study gives an indication that % Ca-DOC is one of the factors that affect the CaCO 3 precipitation potentials. The difference in SUVA-254 values for both stations has been identified and requires further investigation. The SUVA values help in identifying the type of fractions that make up the NOM. The interaction between calcium/magnesium and NOM determines the potential for CaCO 3 to form scale in condenser tubes carrying cooling water in the power generation plants at Eskom.

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Identifying the sources and fate of anthropogenically impacted dissolved organic matter (DOM) in urbanized rivers

Cited by 189 publications

References 51 publications

Effects of Land Use on the Amount and Composition of Dissolved Organic Matter in a Chinese Headwater Stream Watershed

Effects of Land Use on the Amount and Composition of Dissolved Organic Matter in a Chinese Headwater Stream Watershed

Quali-quantitative characterization of organic matter in urbanized drainage basins as a basis for the application of Water Resources Management Instruments

A study of seasonal effects on metal-NOM interactions and the impact of CaCO<sup>3</sup> precipitation potentials using Visual MINTEQ, in raw and cooling water

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