Article
Environmental Sciences
Manfei Lin, Jian Zhen Yu
Summary: The study reveals that oxidative potential (OP) in inhaled ambient fine particulate matter (PM2.5) is mainly caused by transition metals (TMs) and humic-like substances (HULIS), with water-soluble copper (Cu) in Hong Kong samples leading to higher OP than in Beijing samples. Cu is a dominant contributor to hydroxyl radical formation and ascorbic acid depletion, despite higher levels of water-soluble iron (Fe) present.
ENVIRONMENTAL POLLUTION
(2021)
Review
Polymer Science
Peter H. Santschi, Wei-Chun Chin, Antonietta Quigg, Chen Xu, Manoj Kamalanathan, Peng Lin, Ruei-Feng Shiu
Summary: Microgels play critical roles in various ocean processes, with exopolymeric substances from marine microbes being a major source. Many types of pollutants, especially hydrophobic ones, have been found to preferentially associate with marine microgels, impacting their transport and fate in the ocean. This review focuses on the interactions between gel-forming EPS and pollutants in the ocean.
Article
Biochemistry & Molecular Biology
Wan Muhammad Ikram Wan Mohd Zamri, Fridelina Sjahrir, Nor Suhaila Yaacob, Noor Fazreen Dzulkafli, Mohd Fadzli Ahmad, Hasdianty Abdullah, Maegala Nallapan Maniyam, Emi Fazlina Hashim, Nobuyuki Kawasaki, Kazuhiro Komatsu, Victor S. Kuwahara
Summary: Assessing water-extractable organic matter using an autoclave provides valuable insights into soil physical, chemical, and biological changes. Extracts from Malaysian forest soils revealed higher levels of dissolved organic carbon, total dissolved nitrogen, total dissolved phosphorus, and ammonium-nitrate content under autoclave conditions. Soil extracts became slightly acidic with increased temperature and duration, with varying concentrations of fractions observed based on different extraction methods, suggesting potential applications in microbial studies.
Article
Environmental Sciences
Carlo Bravo, Maria De Nobili, Alberto Gambi, Ladislau Martin-Neto, Otaciro R. Nascimento, Rosanna Toniolo
Summary: This study identified two concurrent mechanisms of electron exchange between humic substances and ABTS•, indicating fast and slow transfer processes with potentially different environmental roles. These findings provide a basis for identifying the appropriate conditions for spectrophotometric determination of the fast and slow components of humic substances' electron donating capacity.
Article
Engineering, Environmental
Minjie Chen, Xiao Ling, Anhong Cai, Jing Deng, Shijun Zhu, Hanxuan Zeng, Xueyan Li
Summary: In this study, the dewaterability of waste activated sludge (WAS) was investigated using pyrite activated peroxydisulfate (PDS) conditioning, and the intrinsic mechanism was explored. The experimental results showed that the specific resistance to filtration (SRF) and sludge water content (Wc) decreased significantly with optimal pyrite and PDS dosages. Further analysis revealed that the reactive radicals generated through the reaction of pyrite/PDS destroyed the hydrophilic functional groups in the extracellular polymeric substances (EPS), leading to the release of bound water and the collapse of sludge floc structure. Additionally, the protein structure became looser, exposing the hydrophobic structures and contributing to improved sludge dewaterability.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
K. Khoiruddin, D. Ariono, S. Subagjo, I. G. Wenten
Summary: By modifying AEMs with different hydrophilic additives, this study successfully increased membrane conductivity and resistance to organic fouling. The additives did not significantly affect other properties of the membrane.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Chao Yang, Lin-Xiao Hou, Bei-Dou Xi, Li-An Hou, Xiao-Song He
Summary: This study investigated the redox capacities of compost-derived humic substances (HS) and their impact on the hematite bioreduction. The results showed that compost-derived HS could promote the bioreduction of hematite and their redox capacities increased during composting. The aromatic functional groups and heteroatom structures, particularly nitrogen, were found to be important for the hematite bioreduction.
CHINESE CHEMICAL LETTERS
(2022)
Article
Agronomy
Maris Klavins, Santa Grandovska, Vaira Obuka, Gederts Ievinsh
Summary: Demand for new biological technologies in agriculture, particularly in restoring soil fertility, has led to the development of products from natural sources like humic substances. This study compared the stimulating effects of humic substances from different origins on plant development, finding significant differences based on their sources.
Article
Chemistry, Multidisciplinary
Cheng-Wen Chuang, Wei-Shiang Huang, Yung-Yu Liu, Chi-Ying Hsieh, Ting-Chien Chen
Summary: Different drying methods (air- and freeze-drying) of sediments receiving livestock wastewater discharge affect the chemical properties of the organic matter in sediments. High molecular weight SHS exhibits distinct optical indicators that differentiate the chemical properties between size-fractioned SHS samples.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Hui Liu, Xiaojun Qiu, Zhi Li, Xiaomei Zhu, Bing Sun, Xiaoxing Zhang
Summary: The study found that quinone-like substances in soil humic acids induce the formation of bromophenols in photobromination more effectively than the effluent fraction. This suggests that the composition of dissolved organic matter may control the formation of organobromine contaminants.
ENVIRONMENTAL CHEMISTRY LETTERS
(2021)
Review
Environmental Sciences
Odunayo T. Ore, Adedapo O. Adeola, Oluwaseun Fapohunda, Demilade T. Adedipe, Ajibola A. Bayode, Festus M. Adebiyi
Summary: Humic substances are a major component of organic matter in soils and water, and are essential in various fields such as medicine, agriculture, technology, and the environment. The complex structure and properties of humic substances require advanced analytical tools for elucidation. This review focuses on the different fractions of humic substances, their extraction processes, and their environmental impacts, emphasizing the need for inter- and multidisciplinary studies for sustainable production.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
P. Fourrier, G. Dulaquais, C. Guigue, P. Giamarchi, G. Sarthou, H. Whitby, R. Riso
Summary: This paper presents a multi-analytical approach to characterize marine dissolved organic matter (DOM). The concentration of dissolved organic carbon (DOC) in marine environments was determined using size exclusion chromatography (SEC) and validated with a certified reference material (CRM). The study used multi-detection SEC, fluorescence, and electrochemical methods to describe the size distribution spectra, composition, and chemical properties of marine DOM in the (ultra)oligotrophic West Tropical South Pacific Ocean (WTSP). The results indicate that the state of degradation of DOC varies with different size fractions, as operationally defined by SEC. The study estimates that approximately 62% of DOC in the WTSP is humic in nature (0.5-10 kDa) and around 9% is capable of forming complexes with trace elements such as iron (Fe).
Article
Marine & Freshwater Biology
Ricardo Riso, Manon Mastin, Arthur Aschehoug, Romain Davy, Jeremy Devesa, Agathe Laes-Huon, Matthieu Waeles, Gabriel Dulaquais
Summary: This study presents the composition and dynamics of humic substances along a mixing gradient of a macrotidal estuary. It shows that particulate humic substances significantly contribute to the total humic pool in the estuary and can represent up to 35% of electroactive humic substances. Differences in molecular composition between dissolved and particulate humic substances were observed.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Soil Science
Carlo Bravo, Rosanna Toniolo, Elisa Pellegrini, Christian Millo, Stefano Covelli, Marco Contin, Ladislau Martin-Neto, Maria De Nobili
Summary: This study explored the impact of humic acids (HA) on geochemically important redox processes in saltmarsh soils. The results showed that the electron donating capacity (EDC) of HA depends on their molecular structure and the intensity of biological reduction in tidal environments. The structural characteristics of HA are closely related to the geochemical characteristics of soils.
Article
Polymer Science
Jarrett R. Rowlett, Andrew T. Shaver, Sue Mecham, Judy S. Riffle, James E. McGrath
Summary: A multi block copolymer with increased charge density in the hydrophilic phase was synthesized to enhance proton conductivity and mechanical properties, while limiting water uptake and swelling. The combination of a shorter hydrophilic phase with increased charge density and a longer partially fluorinated hydrophobic phase proved to be effective in achieving superior membrane properties.
Article
Meteorology & Atmospheric Sciences
Katsuya Toyama, Keith B. Rodgers, Bruno Blanke, Daniele Iudicone, Masao Ishii, Olivier Aumont, Jorge L. Sarmiento
JOURNAL OF CLIMATE
(2017)
Article
Oceanography
Ken Arai, Shigeki Wada, Koichi Shimotori, Yuko Omori, Takeo Hama
JOURNAL OF OCEANOGRAPHY
(2018)
Article
Environmental Sciences
Chen-Tung Arthur Chen, Hon-Kit Lui, Chia-Han Hsieh, Tetsuo Yanagi, Naohiro Kosugi, Masao Ishii, Gwo-Ching Gong
NATURE CLIMATE CHANGE
(2017)
Article
Meteorology & Atmospheric Sciences
Yuko Omori, Hiroshi Tanimoto, Satoshi Inomata, Kohei Ikeda, Toru Iwata, Sohiko Kameyama, Mitsuo Uematsu, Toshitaka Gamo, Hiroshi Ogawa, Ken Furuya
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2017)
Review
Oceanography
Eitarou Oka, Masao Ishii, Toshiya Nakano, Toshio Suga, Shinya Kouketsu, Masatoshi Miyamoto, Hideyuki Nakano, Bo Qiu, Shusaku Sugimoto, Yusuke Takatani
JOURNAL OF OCEANOGRAPHY
(2018)
Article
Oceanography
Kushi Kudo, Keita Yamada, Sakae Toyoda, Naohiro Yoshida, Daisuke Sasano, Naohiro Kosugi, Masao Ishii, Hisayuki Yoshikawa, Akihiko Murata, Hiroshi Uchida, Shigeto Nishino
JOURNAL OF OCEANOGRAPHY
(2018)
Article
Meteorology & Atmospheric Sciences
Graham Jones, Mark Curran, Elisabeth Deschaseaux, Yuko Omori, Hiroshi Tanimoto, Hilton Swan, Bradley Eyre, John Ivey, Erin McParland, Albert Gabric, Roger Cropp
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2018)
Article
Oceanography
Shigeki Wada, Yuko Omori, Saki Yamashita, Yasuhito Hayashi, Takeo Hama, Yasuhisa Adachi
JOURNAL OF OCEANOGRAPHY
(2020)
Article
Oceanography
Shigeki Wada, Masao Ishii, Naohiro Kosugi, Daisuke Sasano, Wakana Matsushita, Yuko Omori, Takeo Hama
JOURNAL OF OCEANOGRAPHY
(2020)
Article
Meteorology & Atmospheric Sciences
Siyuan Wang, Eric C. Apel, Rebecca H. Schwantes, Kelvin H. Bates, Daniel J. Jacob, Emily Fischer, Rebecca S. Hornbrook, Alan J. Hills, Louisa K. Emmons, Laura L. Pan, Shawn Honomichl, Simone Tilmes, Jean-Francois Lamarque, Mingxi Yang, Christa A. Marandino, Eric S. Saltzman, Warren de Bruyn, Sohiko Kameyama, Hiroshi Tanimoto, Yuko Omori, Samuel R. Hall, Kirk Ullmann, Thomas B. Ryerson, Chelsea R. Thompson, Jeff Peischl, Bruce C. Daube, Roisin Commane, Kathryn McKain, Colm Sweeney, Alexander B. Thames, David O. Miller, William H. Brune, Glenn S. Diskin, Joshua P. DiGangi, Steven C. Wofsy
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2020)
Article
Oceanography
R. L. Jackson, A. J. Gabric, P. A. Matrai, M. T. Woodhouse, R. Cropp, G. B. Jones, E. S. M. Deschaseaux, Y. Omori, E. L. McParland, H. B. Swan, H. Tanimoto
Summary: The study suggests that coral reefs are significant sources of DMS, with potential implications for local radiative balance. Research on the Great Barrier Reef indicates substantial emissions of DMS and sulfur, highlighting the need for further understanding of the role of tropical coral reefs in climate.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Meteorology & Atmospheric Sciences
Kaori Kawana, Yuzo Miyazaki, Yuko Omori, Hiroshi Tanimoto, Sara Kagami, Koji Suzuki, Youhei Yamashita, Jun Nishioka, Yange Deng, Hikari Yai, Michihiro Mochida
Summary: This study conducted a cruise observation in the western North Pacific to characterize atmospheric aerosols and gaseous air/seawater compounds. The results showed high variability in size distribution and cloud condensation nuclei (CCN) activity of aerosols from different sources.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Environmental Sciences
Sonya L. Fiddes, Matthew T. Woodhouse, Steve Utembe, Robyn Schofield, Simon P. Alexander, Joel Alroe, Scott D. Chambers, Zhenyi Chen, Luke Cravigan, Erin Dunne, Ruhi S. Humphries, Graham Johnson, Melita D. Keywood, Todd P. Lane, Branka Miljevic, Yuko Omori, Alain Protat, Zoran Ristovski, Paul Selleck, Hilton B. Swan, Hiroshi Tanimoto, Jason P. Ward, Alastair G. Williams
Summary: This study quantified the impact of coral-reef-derived DMS on local aerosol at sub-daily timescales for the first time. The results suggest that coral-reef-derived DMS has no significant effect on local aerosol due to the presence of significant anthropogenic aerosol sources near the Great Barrier Reef.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Yuko Omori, Akira Saeki, Shigeki Wada, Yuji Inagaki, Takeo Hama
FRONTIERS IN MARINE SCIENCE
(2020)
Article
Ecology
Naohiro Kosugi, Daisuke Sasano, Masao Ishii, Shigeto Nishino, Hiroshi Uchida, Hisayuki Yoshikawa-Inoue
Article
Chemistry, Multidisciplinary
Morgane Leon, Pieter van Beek, Virginie Sanial, Marc Souhaut, Paul Henderson, Matthew A. Charette
Summary: The analysis of radium and actinium isotopes in seawater requires the collection of large volumes of water and the use of high sensitivity instruments. To concentrate these isotopes, filters impregnated with MnO2 are typically used. However, the extraction efficiency of these filters for the target isotopes needs to be determined.