Article
Environmental Sciences
Jinjing Lan, Lili Liu, Xu Wang, Xiaoxin Wu, Zhiping Wang
Summary: This study analyzed organic pollutants in rural domestic sewage and urban domestic sewage using different spectroscopy techniques. It found that fluorescence excitation-emission matrix (EEM) was able to detect easily degradable organics and reveal the transformation of different components, thus indicating the timely treatment progress of rural sewage. Additionally, the combination of UV254 and fluorescence excitation-emission at Ex/Em = 250/330 nm might be more suitable for predicting COD in rural water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Ruosha Zeng, Chris M. Mannaerts, Caroline Lievens
Summary: UV-VIS spectral analysis methods were used to quantify CDOM absorption properties. Spectroscopic parameters were evaluated for their correlation with H/C and O/C ratios, and S275-295 showed the strongest correlation with H/C ratio, while S-R and E-4/E-6 showed strong correlation with O/C ratio. Gaussian fitting was suitable for single CDOM components, while derivative analysis could be used for single-component discrimination.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Engineering, Civil
Qi Huang, Lizhen Liu, Jiacong Huang, Dianwei Chi, Adam Thomas Devlin, Huawu Wu
Summary: The seasonal dynamics of CDOM and DOC in Poyang Lake are important for understanding biogeochemical processes and water quality. Rivers and wetlands greatly influence the quantity and quality of CDOM. The alternations of flood and dry periods have different effects on CDOM and DOC. Wetlands contribute a higher abundance of CDOM and DOC to the lake with lower aromaticity.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Laura A. Logozzo, Joseph W. Martin, Johnae McArthur, Peter A. Raymond
Summary: Dissolved organic matter (DOM) has an impact on the structure and function of aquatic ecosystems. The presence of Ferric iron, Fe(III), can result in an overestimation of DOM-attributed absorbance. The overestimation is correlated to the Fe(III):dissolved organic carbon concentration ratio and can occur even at low Fe(III) concentrations. UV-Vis overestimation can introduce biases to seasonal, discharge, and land-use trends in DOM quality.
Article
Biodiversity Conservation
Fangfang Zhang, Weiwei Zhang, Suozhi Wu, Xianheng Fu, Shiqing Li, Shanchao Yue
Summary: This study investigated the content and composition characteristics of dissolved organic carbon (DOC) in soil under different agricultural practices using UV-Vis technology. The results showed that the use of gravel and film mulching significantly decreased the DOC content in topsoil, and film mulching also decreased the aromaticity and hydrophobicity of soil. Regression models established between CDOM/DOC, CDOM, SUVA(254), SUVA(260), and SUVA(280) showed high accuracy and can be used to predict soil DOC using UV-Vis technology. This study highlights the potential of UV-Vis spectroscopic technology in rapidly estimating soil DOM in agriculture.
ECOLOGICAL INDICATORS
(2022)
Article
Environmental Sciences
Keting Yuan, Qiong Wan, Beibei Chai, Xiaohui Lei, Aiqing Kang, Jianghai Chen, Xiang Chen, Hongwei Shi, Lixin He, Ming Li
Summary: The study reveals that stormwater runoff has an impact on the concentration of dissolved organic matter (DOM) in Shili River, Jiujiang, China, particularly in the middle reaches. Critical pollutants and DOM concentrations increased due to the runoff. Three humic-like and two protein-like components of DOM were identified using 3DEEM-PARAFAC and UV-Vis spectroscopy. DOM mainly originates from autochthonous sources and is minimally affected by runoff.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Mohamad Rangga Sururi, Mila Dirgawati, Suprihanto Notodarmojo, Dwina Roosmini, Prama Setia Putra, Adam Dzaky Rahman, Chairul Candra Wiguna
Summary: This study investigated CDOM in two urbanized watersheds, examined its changes in two different conventional WTPs, and identified potential surrogate parameters for CDOM compounds. The results showed the presence of tryptophan-like and humic-like compounds. CDOM quantity correlated with FI and BIX, indicating pollution. WTP Dago had the best CDOM removal, while high tryptophan-like concentrations impaired the capability of WTPs to reduce CDOM.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Yang Liu, Jun Sun, Xingzhou Wang, Xiaofang Liu, Xi Wu, Zhuo Chen, Ting Gu, Weiqiang Wang, Linghui Yu, Yu Guo, Yujian Wen, Guodong Zhang, Guicheng Zhang
Summary: This study aimed to characterize marine dissolved organic matter (DOM) in the eastern Indian Ocean by evaluating hydrological parameters, organic carbon concentrations, and using fluorescence indices and spectroscopy methods. The results showed that protein-like components had the highest fluorescence intensity in the surface ocean, while two humic-like components remained relatively constant in the deep layer.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Bing Yi, Jingtao Liu, Wei He, Xiaoli Lu, Xu Cao, Xiaorui Chen, Xianjiang Zeng, Yuxi Zhang
Summary: The direction and quantity of surface water - groundwater interaction in alpine-arid zones can be tracked using multiple tracers. This study used excitation-emission matrix spectroscopy combined with parallel factor analysis to reveal the optical variations in dissolved organic matter in groundwater and surface water with various interactions. The fluorescence spectra were found to be a reliable indicator for identifying the interaction processes from surface water to groundwater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yuyang Li, Yongqiang Zhou, Lei Zhou, Yunlin Zhang, Hai Xu, Kyoung-Soon Jang, Dolly N. Kothawala, Robert G. M. Spencer, Erik Jeppesen, Justin D. Brookes, Thomas A. Davidson, Fengchang Wu
Summary: Large reservoirs are hotspots for carbon emissions, and the input and decomposition of terrestrial dissolved organic matter (DOM) from upstream catchments play a significant role in carbon emissions. Rainstorm events increase the input of DOM and subsequently enhance the emissions of CO2 and CH4. This study found that CO2 and CH4 emissions significantly increased after rainstorm events, and they were influenced by nitrogen and phosphorus levels, DOM absorption, specific UV absorbance, and terrestrial humic-like fluorescence.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Michael A. Rawlins
Summary: Manifestations of climate change in the Arctic are diverse and include intensification of the hydrological cycle and thawing permafrost. Numerical modeling shows significant increases in freshwater and DOC exports to Elson Lagoon in Northwest Alaska over the past four decades, with the largest changes observed in September. This highlights the need for dedicated measurement programs to better understand the impacts of climate change on coastal zone processes in this data sparse region.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Engineering, Environmental
Yuyang Li, Yongqiang Zhou, Lei Zhou, Yunlin Zhang, Hai Xu, Kyoung-Soon Jang, Dolly N. Kothawala, Robert G. M. Spencer, Erik Jeppesen, Justin D. Brookes, Thomas A. Davidson, Fengchang Wu
Summary: The study found that rainstorms can increase the emission of CO2 and CH4 in reservoirs by triggering the input and decomposition of fresh terrestrially derived biolabile DOM. The increase in FCO2 and FCH4 is related to elevated nitrogen and phosphorus levels, DOM absorption, and terrestrial humic-like fluorescence. Additionally, FCO2 and FCH4 decrease with higher chlorophyll-a, dissolved oxygen, and pH levels.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Spectroscopy
Yang Xin, Xia Min, Ye Yin, Wang Jing
Summary: This study comprehensively utilized the 3-D fluorescence spectrum and UV-visible spectrum of water bodies to track the characteristics and spatiotemporal distribution of dissolved organic matter (DOM) in the agricultural watershed of Dianbu River. The results showed that the DOM components included humus and protein, and there were significant seasonal variations.
SPECTROSCOPY AND SPECTRAL ANALYSIS
(2023)
Article
Environmental Sciences
Ruchi Bhattacharya, Christopher L. Osburn
Summary: The study in a coastal river basin in the SE USA showed that high flow events were characterized by elevated flux of humic acid-like CDOM and lower in-stream autochthonous production. In contrast, low flow events were marked by an increased abundance of microbial, humic CDOM that can be easily processed within the estuary. The findings suggest that similar coastal watersheds may contribute substantial amounts of reactive CDOM to the estuaries during high flow conditions, impacting coastal C dynamics.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Soil Science
Md. Imam Hossain, Munehide Ishiguro
Summary: Accurate estimation of DBS concentration in solutions containing DOM is essential for various environmental studies. Our proposed method using UV spectrophotometry at 222.5 and 400 nm wavelengths allows for precise detection of DBS in the presence of DOM. This simple, rapid, and cost-effective method can be used for accurate DBS estimation in various environmental samples.
EUROPEAN JOURNAL OF SOIL SCIENCE
(2022)