Study of the pH influence on the optical properties of dissolved organic matter using fluorescence excitation–emission matrix and parallel factor analysis

Yan, Mingquan; Fu, Qiangwei; Li, Dechao; Gao, Gunfa; Wang, Dongsheng

doi:10.1016/j.jlumin.2013.02.052

Cited by 63 publications

(24 citation statements)

References 42 publications

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“…Similar qualitative EEM contours were observed in all cases, with a well defined peak at excitation/emission (Ex/Em) wavelengths (nm) of 320/430; however, there were quantitative differences, as the fluorescence intensity of EEMs showed a clear dependence on the solution pH and higher values of fluorescence intensity at the 320/430 peak were observed at pH 5. A similar behavior of natural organic matter with pH has also been observed for Yan et al 27 Although the intrinsic quenching and enhancement mechanism is currently not clear, it has been accepted that carboxylic chromophores significantly contributed to the changes in fluorescence of HS at pH values between 3.0 and 5.0, whereas phenolic chromophores are predominant at pH values between 8.0 and 10.0. 28 In addition, the structure of HS and HLS varies with modifications in their environment as pH changes, which could result in the precipitation of both HS and HLS at pH below 3, thus modifying the recorded fluorescence intensities.…”

Section: Fluorescence Quenching Titrations Of Sbo With Fe(iii)supporting

confidence: 78%

Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study

Garcia-Ballesteros

Costante

Vicente

et al. 2017

Photochem Photobiol Sci

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In this work, analysis of excitation-emission-matrices (EEM) has been employed to gain further insight into the characterization of humic like substances (HLS) obtained from urban wastes (soluble bio-organic substances, SBOs). In particular, complexation of these substances with iron and changes along a photo-Fenton process have been studied. Recorded EEMs were decomposed by using parallel factor analysis (PARAFAC). Three fluorescent components were identified by PARAFAC modeling of the entire set of SBO solutions studied. The EEM peak locations (λ/λ) of these components were 310-330 nm/400-420 nm (C1), 340-360 nm/450-500 nm (C2), and 285 nm/335-380 nm (C3). Slight variations of the maximum position of each component with the solution pH were observed. The interaction of SBO with Fe(iii) was characterized by determining the stability constants of the components with Fe(iii) at different pH values, which were in the order of magnitude of the ones reported for humic substances and reached their highest values at pH = 5. Photochemical experiments employing SBO and Fe(iii), with and without HO, showed pH-dependent trends for the evolution of the modeled components, which exhibited a strong correlation with the efficiency reported for the photo-Fenton processes in the presence of SBO at different pH values.

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Section: Fluorescence Quenching Titrations Of Sbo With Fe(iii)supporting

confidence: 78%

Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study

Garcia-Ballesteros

Costante

Vicente

et al. 2017

Photochem Photobiol Sci

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“…However, the pH range of our typhoon and base-flow DOM samples were alkaline (8.17–9.4), when comparing with studies using pH as a factor to quantify DOM variations (e.g. Yan et al, 2013). The samples are well-buffered due to the abundance of carbonate ions in the river water from Tsengwen catchment (Shih et al in preparation), thus not expecting a massive change in pH after the acid addition.…”

Section: Methodsmentioning

confidence: 79%

Differences in N loading affect DOM dynamics during typhoon events in a forested mountainous catchment

Yeh

Liao

Chen

et al. 2018

Science of The Total Environment

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The dissolved organic matter (DOM) and nutrient dynamics in small mountainous rivers (SMRs) strongly depend on hydrologic conditions, and especially on extreme events. Here, we investigated the quantity and quality of DOM and inorganic nutrients during base-flow and typhoon events, in a chronically N-saturated mainstream and low N-loaded tributaries of a forested small mountainous reservoir catchment in Taiwan. Our results suggest that divergent transport mechanisms were triggered in the mainstream vs. tributaries during typhoons. The mainstream DON increased from 3.4 to 34.7% of the TDN pool with a static DOC:NO-N ratio and enhanced DOM freshness, signalling a N-enriched DOM transport. Conversely, DON decreased from 46 to 6% of the TDN pool in the tributaries and was coupled with a rapid increase of the DOC:NO-N ratio and humified DOM signals, suggesting the DON and DOC were passively and simultaneously transported. This study confirmed hydrology and spatial dimensions being the main drivers shaping the composition and concentration of DOM and inorganic nutrients in small mountainous catchments subject to hydrologic extremes. We highlighted that the dominant flow paths largely controlled the N-saturation status and DOM composition within each sub-catchment, the effect of land-use could therefore be obscured. Furthermore, N-saturation status and DOM composition are not only a result of hydrologic dynamics, but potential agents modifying the transport mechanism of solutes export from fluvial systems. We emphasize the importance of viewing elemental dynamics from the perspective of a terrestrial-aquatic continuum; and of taking hydrologic phases and individual catchment characteristics into account in water quality management.

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“…The functional group of DOM (e.g. carboxylic, phenolic, alcoholic, carbony) was sensitive to pH (Yan et al, 2013). The acid/alkaline might weaken the hydrogen bond between the humic-like substance and the hydrochar/biochars, enhancing the release of humic-like substances from the hydrochar/biochars.…”

Section: Characteristics Of Eem-parafac Components Of Hydrochar and Biocharmentioning

confidence: 99%

The comparison of dissolved organic matter in hydrochars and biochars from pig manure

Song

Shan

Yang

et al. 2020

Science of The Total Environment

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Study of the pH influence on the optical properties of dissolved organic matter using fluorescence excitation–emission matrix and parallel factor analysis

Cited by 63 publications

References 42 publications

Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study

Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study

Differences in N loading affect DOM dynamics during typhoon events in a forested mountainous catchment

The comparison of dissolved organic matter in hydrochars and biochars from pig manure

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