Article
Engineering, Environmental
Xiaowei Wu, Peng Liu, Zhimin Gong, Hanyu Wang, Hexinyue Huang, Yanqi Shi, Xiaoli Zhao, Shixiang Gao
Summary: The photoaging of polypropylene microplastics in lake water was found to be significantly inhibited by humic acid and fulvic acid, acting as scavengers of reactive oxygen species and optical light filters. This inhibition mechanism reduces the formation of harmful oxidants and competes with the microplastics for light, resulting in less fragmentation and changes in properties.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Jianhua Zhu, Jia Duo, Zizhao Zhang, Liang Pei, Wenfeng Li, Rehemanjiang Wufuer
Summary: This study investigated the structural characteristics and main properties of dissolved organic matter (DOM) in farmland soils near Urumqi, China, using three-dimensional fluorescence spectroscopy (EEM) and UV-visible spectrum technology, and analyzed its possible sources and pathways through spectroscopic indices. The results showed that humic-like substances were the main composition of soil DOM, and its autogenesis characteristics were not obvious. The DOM properties in the southern region of Urumqi were higher than those in the northern region and in Fukang, China, and higher in the upper layers of the soil than in the deeper layer. Spectroscopic analysis indicated that the DOM in these regions mainly originated from microbial metabolites. These findings provide important scientific data for further research on pollutant behavior and pollution control in the region.
Article
Environmental Sciences
Nannan Huang, Jin Zhang, Chen Zhao, Siyang Li, Zhen Lu
Summary: The study revealed that the subcomponents of FA exhibit fluorescence quenching when interacting with Cu(II), with FA(3) and FA(9) materials showing higher carboxylic group content and stronger affinity with Cu(II).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Water Resources
Arti Sharma, Ritika Anthal
Summary: The present study aimed to understand the chemical properties of aquatic fulvic acid in Lake Mansar and analyze the physical and chemical environment of the lake. The yield of fulvic acid in Lake Mansar was found to be low, and it was mainly derived from algae and non-vascular plants that have undergone less humification.
APPLIED WATER SCIENCE
(2022)
Article
Environmental Sciences
Chen Xu, Peng Lin, Ravindranath Garimella, Dien Li, Wei Xing, Nicole E. Patterson, Daniel Kaplan, Chris M. Yeager, Patrick G. Hatcher, Peter H. Santschi
Summary: The complex behavior of iodine isotopes and their interaction with natural organic matter pose a challenge for transport models. This study investigates the iodination of humic and fulvic acid and shows how it chemically alters the behavior of these organic matter, potentially affecting their mobility in the environment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yuito Tameta, Ryoji Tamura, Mao Kimura, Makoto Sasamoto, Nao Kamei-Ishikawa, Ayumi Ito
Summary: This study evaluated the impact of DSOM on the Cs sorption by zeolite and illite in soil. Results showed that DSOM inhibited Cs sorption onto clay minerals, with a higher Cs sorption observed in the ionic solution compared to the soil solution.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Multidisciplinary Sciences
T. Kloskowski, K. Szeliski, K. Krzeszowiak, Z. Fekner, L. Kazimierski, A. Jundzill, T. Drewa, M. Pokrywczynska
Summary: The study found that Mumio exhibited significant cytotoxicity to urinary bladder cancer cells, while having minimal impact on normal cells. Mumio works by inhibiting the cell cycle of cancer cells and inducing apoptosis.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Yiming Fang, Hiroshi Sakai
Summary: UV-activated persulfate showed more efficient treatment of humic substances compared to hydrogen peroxide and direct irradiation, with treatment effectiveness depending on persulfate concentrations and UV wavelengths. Lower molecular weight components were more susceptible to degradation, eventually leading to effective removal of humic substances.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Lu Liu, Wanyi Fang, Meng Yuan, Xiaohan Li, Xiaorou Wang, Yingjie Dai
Summary: This study utilized fulvic acid and citric acid to modify walnut shell powder, resulting in biochar with enhanced adsorption performance. The modified biochar showed significant adsorption capacity and regeneration capability in agricultural wastewater, providing valuable insights for further research on adsorption mechanisms and process optimization.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Jia Wen, Zhuangzhuang Xue, Xiyan Yin, Xue Wang
Summary: This study focused on the adsorption efficiency of biochar and iron-modified biochar in treating Cr(VI) in wastewater. The results showed that iron-modified biochar had better adsorption efficiency, but the addition of lactic acid may decrease the removal of Cr(VI).
Article
Spectroscopy
Elli Pitta, Christina Zeri
Summary: This study examined the impact of co-analyzing datasets from different natural water sources in the Eastern Mediterranean Sea on PARAFAC analysis, finding both positive and negative effects. The reliability of components and similarity of common identified components were evaluated through residual analysis and correlation assessment. The study concluded that the resolution of extra components in combined analysis can have varying effects on model fit and should be carefully assessed.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Environmental Sciences
Yury Zhernov, Andrey Konstantinov, Alexander Zherebker, Eugene Nikolaev, Alexey Orlov, Mikhail Savinykh, Galina Kornilaeva, Eduard Karamov, Irina Perminova
Summary: Natural products such as humic substances and shilajit have antiviral activity, with humic substances showing stronger anti-HIV activity compared to shilajit. The presence of aromatic structures in humic substances correlates with their anti-HIV activity, while shilajit exhibits a different mechanism. Aromatic structures with alkyl substituents, terpenoids, N-containing analogs of typical flavonoids, and azapodophyllotoxins were identified as potential carriers of antiviral activity in humic substances.
ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Environmental
Yuchao Shao, Menggang Bao, Weizhong Huo, Rong Ye, Muhammad Ajmal, Wenjing Lu
Summary: This study compared the humification potential of hydrochar, hydrothermal solution, and their mixture under alkaline hydrothermal conditions. The results showed that hydrochar was the main source of hydrothermal humic acid (HHA), while hydrothermal solution had a smaller contribution. The pathways of alkaline hydrothermal humification of hydrochar were also revealed through in-depth analysis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Wenqing Luo, Xin Zhao, Gongting Wang, Zedong Teng, Yali Guo, Xiaonan Ji, Wei Hu, Min Li
Summary: The effects of humic acids (HA) and fulvic acids (FA) on the fate of Cd in anaerobic environment were investigated. The results showed that HA and FA could promote the reductive dissolution of Cd-bearing ferrihydrite and the formation of vivianite. HA was better than FA in immobilizing Cd.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Hanyu Wu, Jie Chen, Zengbo Su, Bin Ma, Yizhe Ji, Shuhan Lin, Dingfang Xu, Mingliang Kang
Summary: Eu(III) adsorption on muscovite and phlogopite was investigated under different conditions, showing pH dependency and Na+ independent for both micas, with interlayer sites only available on phlogopite under Na+ and Ca2+ electrolytes. Adsorption of Eu(III) on phlogopite led to interlayer expansion, and the addition of fulvic acid affected both the adsorption behavior of Eu(III) and the structural alteration of phlogopite.
Article
Environmental Sciences
Kyle P. Milke, Kiana L. Mitchell, Sarah M. Hayes, Carlin J. Green, Jennifer J. Guerard
Summary: The study found that interactions between fly ash and aqueous media are influenced by equilibrium with the solid phase, with oxyanion-forming elements being relatively low and constant in supernatant concentrations. Lead and Ba concentrations consistently exceeded drinking water standards, and liberation of certain elements was influenced by carbon concentration and the identity of the isolate in dissolved organic matter-isolate solutions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Water Resources
Michael N. Gooseff, Diane M. McKnight, Peter T. Doran, Andrew Fountain
Summary: The McMurdo Dry Valleys, the largest ice-free region in Antarctica, have a milder climate and rely on the melting of glaciers for water sources. There are multiple meteorological and stream gauging stations operating in the valleys, collecting data that supports ecological research and other scientific endeavors.
HYDROLOGICAL PROCESSES
(2022)
Article
Limnology
Birgit Koehler, Leanne C. Powers, Rose M. Cory, Karolina Einarsdottir, Yufei Gu, Lars J. Tranvik, Anssi V. Vahatalo, Collin P. Ward, William L. Miller
Summary: Solar radiation induces photochemical oxidation of dissolved organic carbon (DOC) to dissolved inorganic carbon (DIC) in inland waters, contributing to the release of carbon dioxide into the atmosphere. The apparent quantum yield (AQY) spectrum is a critical model parameter for determining photochemical DIC production. In this study, four laboratories determined AQY spectra for eight inland water samples from Alaska, Finland, and Sweden, and found high variability among laboratories and water bodies.
LIMNOLOGY AND OCEANOGRAPHY-METHODS
(2022)
Article
Ecology
Evelyn E. Gaiser, John S. Kominoski, Diane M. McKnight, Christie A. Bahlai, Chingwen Cheng, Sydne Record, Wilfred M. Wollheim, Kyle R. Christianson, Martha R. Downs, Peter A. Hawman, Sally J. Holbrook, Abhishek Kumar, Deepak R. Mishra, Noah P. Molotch, Richard B. Primack, Andrew Rassweiler, Russell J. Schmitt, Lori A. Sutter
Summary: The COVID-19 pandemic disrupted human activity, leading to changes in human-ecosystem interactions, known as the anthropause. The effects of the anthropause on ecosystem states and functions, as well as its feedback to human systems through ecosystem services, are still uncertain. This study proposes new investigation pathways using a disturbance framework to capture the effects of the anthropause through coordinated, long-term social-ecological research. Although it is still early to comprehensively evaluate these effects, case studies using long-term data show changes in air and water quality, as well as wildlife populations and behavior coinciding with the anthropause. These findings highlight the importance of long-term data in understanding the impacts of the anthropause and separating them from natural variation and long-term trends.
Editorial Material
Environmental Sciences
James B. Cotner, Stephen M. Powers, Steven Sadro, Diane McKnight
Summary: Our changing climate is affecting freshwater ecosystems, particularly in winter. Lakes, wetlands, and rivers at high latitudes are experiencing shorter periods of ice cover, while lower latitudes systems are seeing open water conditions throughout the winter. These changes impact gas exchange, metabolism, and other processes in the water. There is a need for further research to understand the effects of changing winters on freshwater systems.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Microbiology
Shasten Sherwell, Isha Kalra, Wei Li, Diane M. McKnight, John C. Priscu, Rachael M. Morgan-Kiss
Summary: The McMurdo Dry Valleys in Antarctica have experienced climatic changes that have impacted the microbial communities in its lakes. The rise in lake levels and loss of ice cover have led to shifts in community composition, accumulation of organic carbon, and sensitivities in specific taxa. These disturbances are likely to undermine the stability and productivity of phytoplankton and bacterial communities in the future.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Environmental Sciences
Jessica K. Egan, Diane M. McKnight, Maggie M. Bowman, Michael D. SanClements, Adrian C. Gallo, Jeff A. Hatten, Lauren M. Matosziuk
Summary: Many forested watersheds that serve as the origin of numerous streams are at risk of wildfires, which can introduce thermally altered organic compounds to terrestrial and aquatic systems. This study used fluorescence spectroscopy to examine the photochemical alterations of dissolved pyrogenic organic material (PyDOM) derived from burned organic matter leachates. The results showed that PyDOM is susceptible to photodegradation, and fluorescence measurements can be used as proxies for detecting PyDOM immediately post-wildfire.
Article
Biodiversity Conservation
Kelly E. Watson, Diane M. McKnight
Summary: Acid rock drainage has an impact on species composition in mountain streams, but the potential effects on riparian birds consuming benthic invertebrates with elevated metal uptake are poorly understood. This study in an ARD-impacted watershed in Colorado found that metal and rare earth element concentrations in water and invertebrates were not significant predictors of avian presence. Climate-change-driven increases in metals and REEs may not influence the presence of riparian birds in ARD-impacted streams.
Article
Environmental Sciences
Kathi Jo Jankowski, Keira Johnson, Lienne Sethna, Paul Julian, Adam S. Wymore, Arial J. Shogren, Patrick K. Thomas, Pamela L. Sullivan, Diane M. Mcknight, William H. Mcdowell, Ruth Heindel, Jeremy B. Jones, Wilfred Wollheim, Benjamin Abbott, Linda Deegan, Joanna C. Carey
Summary: Riverine exports of silicon (Si) play a crucial role in global carbon cycling by influencing the growth of marine diatoms. Climate change is expected to affect river Si exports in different ways due to shifts in weathering rates, hydrologic connectivity, and metabolic processes. We analyzed long-term data from 60 rivers and streams worldwide and found significant changes in river Si concentration and yield, driven by differences in land cover and independent of river discharge. Our findings highlight the importance of diverse mechanisms at the land-water interface in shaping river Si biogeochemistry and emphasize the role of shifting seasonality in Si flux.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Water Resources
Matthew M. Jones, Robert L. Runkel, Diane M. Mcknight
Summary: A synoptic study was conducted to assess the water quality in Warden Gulch, a headwater stream impacted by both natural and mining-related sources of metals. The study found that despite the negative impact of mining-derived waste streams, the dominant sources of metal loading in Warden Gulch are from natural contributions. Furthermore, some mining-impacted sources associated with diffuse groundwater inflows may not be amenable to cleanup. Therefore, remedial measures targeting these sources may not significantly improve the water quality of Peru Creek and the larger Snake River watershed.
MINE WATER AND THE ENVIRONMENT
(2023)
Article
Biotechnology & Applied Microbiology
Matthew Mcglennen, Markus Dieser, Christine M. Foreman, Stephan Warnat
Summary: This study demonstrates the use of microfabricated electrochemical impedance spectroscopy (EIS) biosensors for real-time monitoring and treatment evaluation of biofilm growth, offering valuable insights for biofilm control in industrial settings. The results show that biofilm growth on EIS biosensors attenuated in a sigmoidal decay pattern and subsequent treatment increased impedance. Addition of a quorum-sensing inhibitor (QSI) led to no change in impedance, and biofilm changes from confocal laser scanning microscopy corroborated impedance measurements.
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
(2023)
Article
Microbiology
Christine M. Foreman, Heidi J. Smith, Markus Dieser
Summary: This study reports the genomic sequences of bacterial isolates from Pony Lake in Antarctica, revealing the genetic potential linked to dissolved organic matter (DOM) processing.
MICROBIOLOGY RESOURCE ANNOUNCEMENTS
(2023)
Article
Chemistry, Analytical
Dhurba Raj Pandey, Catherine Polik, Rose M. Cory
Summary: In Lake Erie, the occurrence of harmful algal blooms (HABs) is related to high concentrations of hydrogen peroxide (H2O2). The production of H2O2 in Lake Erie is influenced by the chromophoric fraction of dissolved organic matter (CDOM) through photochemical reactions. However, the exact controls of H2O2 production from CDOM remain unclear. By measuring phiH2O2,lambda and CDOM concentration in Lake Erie, this study found that the variability in rates of photochemical H2O2 production is predominantly influenced by phiH2O2,lambda and CDOM concentration. However, there are still other unknown factors controlling H2O2 production in Lake Erie.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2022)