Characterization and bioavailability of rainwater dissolved organic matter at the southeast coast of China using absorption spectroscopy and fluorescence EEM-PARAFAC

Yang, Liyang; Chen, Wei; Zhuang, Wei; Cheng, Qiong; Li, Wenxin; Wang, Hui; Guo, Weidong; Chen, Chen‐Tung Arthur; Liu, Minghua

doi:10.1016/j.ecss.2018.11.002

Cited by 64 publications

(19 citation statements)

References 72 publications

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“…Before injection, the extracts were diluted with dis- tilled water (1 mL of extract plus 0.3 mL of distilled water) to avoid the peak distortion of the first eluting pigments. Pigments were assessed by HPLC analysis following the method of Zapata et al (2000). Before analysis, the instrument (Agilent series 1200 chromatographic system, Germany) was calibrated using standard pigments (DHI, Denmark).…”

Section: Phytoplankton Taxonomic Compositionmentioning

confidence: 99%

Characteristics of methanesulfonic acid, non-sea-salt sulfate and organic carbon aerosols over the Amundsen Sea, Antarctica

et al. 2020

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Abstract. To investigate the characteristics of particulate methanesulfonic acid (MSA(p)), non-sea-salt sulfate (nss SO42-) and organic carbon (OC) aerosols, aerosol and seawater samples were collected over the Southern Ocean (43–70∘ S) and the Amundsen Sea (70–75∘ S) during the ANA06B cruise conducted in the austral summer of 2016 aboard the Korean icebreaker IBR/V Araon. Over the Southern Ocean, the atmospheric MSA(p) concentration was low (0.10±0.002 µg m−3), whereas its concentration increased sharply up to 0.57 µg m−3 in the Amundsen Sea where Phaeocystis antarctica (P. antarctica), a producer of dimethylsulfide (DMS), was the dominant phytoplankton species. Unlike MSA(p), the mean nss SO42- concentration in the Amundsen Sea was comparable to that in the Southern Ocean. Water-soluble organic carbon (WSOC) concentrations over the Southern Ocean and the Amundsen Sea varied from 0.048 to 0.16 and 0.070 to 0.18 µgC m−3, with averages of 0.087±0.038 and 0.097±0.038 µgC m−3, respectively. For water-insoluble organic carbon (WIOC), its mean concentrations over the Southern Ocean and the Amundsen Sea were 0.25±0.13 and 0.26±0.10 µgC m−3, varying from 0.083 to 0.49 and 0.12 to 0.38 µgC m−3, respectively. WIOC was the dominant organic carbon species in both the Southern Ocean and the Amundsen Sea, accounting for 73 %–75 % of the total aerosol organic carbon. WSOC/Na+ and WIOC/Na+ ratios in the fine-mode aerosol particles were higher, especially in the Amundsen Sea where biological productivity was much higher than the Southern Ocean. The fluorescence properties of water-soluble organic aerosols investigated using a fluorescence excitation–emission matrix coupled with parallel factor analysis (EEM–PARAFAC) revealed that protein-like components were dominant in our marine aerosol samples, representing 69 %–91 % of the total intensity. Protein-like components also showed a significant positive relationship with the relative biomass of diatoms; however, they were negatively correlated with the relative biomass of P. antarctica. These results suggest that the protein-like component is most likely produced as a result of biological processes of diatoms in the Amundsen Sea.

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Section: Phytoplankton Taxonomic Compositionmentioning

confidence: 99%

Characteristics of methanesulfonic acid, non-sea-salt sulfate and organic carbon aerosols over the Amundsen Sea, Antarctica

et al. 2020

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“…In addition to bulk dissolved organic carbon (DOC), measurements of chromophoric DOM (CDOM), including UV‐absorbance and fluorescence DOM (FDOM) using excitation‐emission matrices (EEM), have been reported for the Yukon River (Belzile and Guo 2006; Spencer et al 2009; Aiken et al 2014). Over the last two decades, EEM coupled with parallel factor (PARAFAC) analysis have been widely used to characterize natural DOM in both freshwater and saltwater ecosystems (Stedmon and Bro 2008; Murphy et al 2013; Yang et al 2019). To the best of our knowledge, there is not a single study thus far reporting the characteristics and fluorescent components of the DOM in the lower Yukon River using these recently developed techniques.…”

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confidence: 99%

Dynamic changes in size‐fractionated dissolved organic matter composition in a seasonally ice‐covered Arctic River

Lin

Cai

et al. 2021

Limnology & Oceanography

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Arctic rivers are sensitive to climate and environmental change, but the biogeochemical response remains poorly understood. Monthly size-fractionated dissolved organic matter (DOM) samples from the lower Yukon River were characterized using UV-visible, fluorescence, and Fourier transform-infrared (FT-IR) spectroscopy techniques. The EEM-PARAFAC analysis revealed three major fluorescent DOM components, including two humic-like components (C 480 and C 400 ) and one protein-like component (C 310 ), with their relative importance following the order of C 480 ≥ C 400 > C 310 in the high-molecular-weight DOM (1 kDa-0.4 μm) and C 400 > C 480 > C 310 in the low-molecular-weight DOM pool (< 1 kDa). Transformation in DOM and change in sources were manifested in major fluorescent components and optical properties, including biological index (BIX), humification index (HIX), spectral slope (S 275-295 ) and specific UV absorbance at 254 nm (SUVA 254 ). These changes occurred within different DOM size-fractions and among ice-covered, spring freshet, and open seasons. Joint analysis of EEM and FT-IR spectra using a data fusion technique showed that humic-like DOM is mostly associated with C─H, C═C, and C─O bonds, while protein-like DOM is correlated more with C─N and N─H related structures. DOM aromaticity and the ratios of HIX to BIX and protein-like to humic-like components may be used as a compelling proxy to measure change in source waters and to infer permafrost dynamics. Our results provide insight into the seasonal variation in DOM composition for different size-fractions in the lower Yukon River, and a baseline dataset against which future changes can be understood in the context of arctic basin biogeochemical cycling.

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“…5). Principal component analysis (PCA) based on DOM indices revealed two principal factors, which were related to the concentration and humic-type DOM, respectively [31]. Most significantly, the clustering in the PCA Fig.…”

Section: Classification Using Multivariate Statistical Evaluationmentioning

confidence: 99%

“…In general, the authors acknowledge that wells which were not covered also showed increased DOM fluorescence during the rainy season. This is so because rainwater brings considerable amounts of dissolved organic matter (DOM) in fractions of low aromaticity and humification degree from the atmosphere to freshwater and marine environments, but little is known about the chemical composition and bioavailability of rainwater DOM [64]. With regard to seasonality, higher concentrations of humic-like DOM were observed during the wet season as a result of leachates from toilets and wetlands, old refuse damps, septic tanks and marshy areas.…”

Section: Identification Of Dom Using Laser-induced Fluorescence Spectmentioning

confidence: 99%

Dissolved organic matter in hand-dug well water as groundwater quality indicator: assessment using laser-induced fluorescence spectroscopy and multivariate statistical techniques

et al. 2020

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In groundwater, dissolved organic matter (DOM), a complex material, is a contaminant of concern owing to its ability to influence water quality and stimulate microbial metabolism. Using a 445-nm diode laser-induced fluorescence (LIF) spectroscopy, DOM contamination levels have been investigated of well water samples fetched from ten privately owned hand-dug wells during dry and wet seasons of 2016, 2017 and 2018, in Ghana. The results showed spatio-temporal heterogeneities in the LIF spectra, and the fluorescence intensity peaks were generally higher and broader during the wet season than the dry season. In this study, DOM fluorescence spectra at an emission wavelength band of 460-650 nm showed two distinct broad peak shoulders within 480-500 nm and 550-570 nm, engulfing the water Raman peak at 527 ± 2 nm for all the water samples studied. Furthermore, principal component analysis and cluster analysis were used to differentiate the 2016 water samples based on their DOM contamination levels. In each case, three groups or clusters were identified based on their similarities and dissimilarities. The study revealed humic DOM substances as the most typical well water fluorophores. Applying the K-nearest neighbour algorithm as a classifier method for the classification of 30 water samples studied in 2016, 16.7% (5/30) were classified as very good drinking water, 46.7% (14/30) as good, 26.7% (8/30) as fairly good, and 10% (3/30) as bad drinking water samples. In general, levels of dissolved organic matter contamination increased over the study period during the rainy seasons for wells situated in close proximity to septic tanks, refuse dumps, public toilets and in wetlands. Thus, in the study the fluorescence intensity depends on the sampling site and the season, and indicates the DOM contamination level.

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Characterization and bioavailability of rainwater dissolved organic matter at the southeast coast of China using absorption spectroscopy and fluorescence EEM-PARAFAC

Cited by 64 publications

References 72 publications

Characteristics of methanesulfonic acid, non-sea-salt sulfate and organic carbon aerosols over the Amundsen Sea, Antarctica

Characteristics of methanesulfonic acid, non-sea-salt sulfate and organic carbon aerosols over the Amundsen Sea, Antarctica

Dynamic changes in size‐fractionated dissolved organic matter composition in a seasonally ice‐covered Arctic River

Dissolved organic matter in hand-dug well water as groundwater quality indicator: assessment using laser-induced fluorescence spectroscopy and multivariate statistical techniques

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