Article
Green & Sustainable Science & Technology
Seyed Amirebrahim Emami Moghaddam, Parinaz Ghadam, Fatemeh Rahimzadeh
Summary: This study successfully biosynthesized high-quality cadmium sulfide nanoparticles using the aqueous extract of Lactobacillus acidophilus and improved the biosynthesis process using response surface methodology.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Yinxuan Lin, Jiao Yu, Meng Wang, Lingling Wu
Summary: The combined pollution of antibiotics and heavy metals has harmful effects on the embryonic development of aquatic organisms, particularly zebrafish. The toxicity of the combined pollution is stronger than that of individual contaminants and leads to decreased heart rate, hatching rate, and increased malformation of zebrafish embryos. The co-exposure to antibiotics and heavy metals also results in oxidative stress-induced damage and increased cell apoptosis. This study highlights the importance of paying attention to the potential health risks of combined pollution for higher vertebrates and humans.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Environmental
Zhiyue Niu, Michiel B. Vandegehuchte, Ana Isabel Catarino, Gert Everaert
Summary: The study found that microplastic at environmentally relevant concentrations and sizes does not alter the growth of marine diatoms like Phaeodactylum tricornutum. The results provide high quality dose-response data for improved risk assessment of microplastic pollution in present and future marine environments.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Geetika Bhagwat, Thi Kim Anh Tran, Dane Lamb, Kala Senathirajah, Ian Grainge, Wayne O'Connor, Albert Juhasz, Thava Palanisami
Summary: This study compared the adsorption capacity of naturally aged, biofilm-covered microplastic fibers (BMFs) for perfluorooctane sulfonate (PFOS) and lead (Pb) at environmentally relevant concentrations. Results showed that aged MFs exhibited higher surface areas due to biomass accumulation and had higher concentrations of adsorbed Pb and PFOS, with variations among polymer types. The increased contaminant adsorption was linked with altered surface area and hydrophobic/hydrophilic characteristics of the samples.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Wenyue Qiu, Jiali Ye, Yiman Su, Xinting Zhang, Xiaoyue Pang, Jianzhao Liao, Rongmei Wang, Cuiyan Zhao, Hui Zhang, Lianmei Hu, Zhaoxin Tang, Rongsheng Su
Summary: This study conducted a 35-day chronic toxicity experiment on mice to observe the effects of exposure to Cadmium (Cd) and polystyrene nanoplastics (PSNPs). The results showed that combined exposure to Cd and PSNPs increased the mice's growth toxicity and kidney damage. Moreover, it was found that Cd and PSNPs co-exposure led to oxidative stress, increased iron concentration, and induced ferroptosis and excessive mitophagy in the kidneys. This study provides new insights into the combined toxic effect of heavy metals and PSNPs on mammals.
ENVIRONMENTAL POLLUTION
(2023)
Article
Chemistry, Analytical
Cecily Szady, Grace Picarillo, Emily J. J. Davis, Donata Drapanauskaite, Kristina Buneviciene, Jonas Baltrusaitis, Juan G. G. Navea
Summary: Combustion particles, such as ash from power plants, can accumulate and become environmental concerns. In this study, iron dissolution from two types of combustion particles was compared. The results showed that the solubility of iron is influenced by the particle's surface properties and can provide iron micronutrients under different acidic conditions.
ENVIRONMENTAL CHEMISTRY
(2023)
Article
Engineering, Environmental
Xiaolei Wei, Christer Hogstrand, Guanghui Chen, Wuhong Lv, Yufeng Song, Yichuang Xu, Zhi Luo
Summary: This study found that Zn activated lipophagy, alleviating Cu-induced lipid accumulation by promoting deacetylation of Beclin1. This previously unidentified mechanism sheds light on the antagonistic effects of Cu and Zn on metabolism at environmentally relevant concentrations. The importance of combined exposure and the role of Beclin1 deacetylation in promoting lipophagy were highlighted in understanding the biological effects of heavy metals during environmental risk assessments.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Geochemistry & Geophysics
Luke T. Townsend, Kurt F. Smith, Ellen H. Winstanley, Katherine Morris, Olwen Stagg, J. Frederick W. Mosselmans, Francis R. Livens, Liam Abrahamsen-Mills, Richard Blackham, Samuel Shaw
Summary: Neptunium (Np-237) is an important radionuclide in the nuclear fuel cycle, and its mobility can be significantly affected by various chemical processes. In this study, Np interactions with key iron minerals were investigated using X-ray Absorption Spectroscopy, revealing that Np may undergo different speciation changes in different systems.
Article
Marine & Freshwater Biology
Nermeen Ashraf, Milada Vitova, Peter Cloetens, Ana Mijovilovich, Syed Nadeem Hussain Bokhari, Hendrik Kupper
Summary: The research revealed that the effects of lanthanum on Desmodesmus quadricauda ranged from filling cells at sublethal concentrations to releasing other ions at lethal concentrations, leading to inhibition of photosynthesis and significant decrease in cell counts.
AQUATIC TOXICOLOGY
(2021)
Article
Chemistry, Physical
Zahra Lotfi, Mohammad Bagher Gholivand, Mojtaba Shamsipur, Mahin Mirzaei
Summary: A novel nanocomposite was prepared as an excellent modifier for the electrochemical detection of acyclovir. The fabricated sensor showed satisfactory performance in the quantitative detection of acyclovir in blood serum, tablet, and topical cream samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Analytical
Laura Aislinn Carrasco-Chavez, Jose F. Rubio-Valle, Abimael Jimenez-Perez, Jose E. Martin-Alfonso, Amanda Carrillo-Castillo
Summary: Chalcogenides semiconductors, such as cadmium sulfide (CdS), have potential applications in optoelectronic devices. This study focuses on the synthesis and analysis of CdS thin films and CdS nanoparticles. The CdS thin films were deposited using chemical bath deposition, while the CdS nanoparticles were synthesized via the precipitation method. The CdS nanoparticles were incorporated on the CdS thin films to form a homojunction. The resulting modified thin films exhibited good transmittance, with a band gap between 2.12 eV and 2.35 eV. Raman spectroscopy confirmed the hexagonal and cubic crystalline structure of the CdS thin films/CdS nanoparticles, with an average crystallite size of 21.3-28.4 nm. The interface between the CdS nanoparticles and metal exhibited ohmic behavior.
Article
Chemistry, Multidisciplinary
Craig J. Dedman, Aaron M. King, Joseph A. Christie-Oleza, Gemma-Louise Davies
Summary: Nano-sized titanium dioxide (nTiO2) has a significant impact on marine microbial populations, with higher concentrations leading to declines in cyanobacterial populations but eventual recovery in natural seawater. However, the potential for adverse effects in contamination hotspots cannot be ruled out, and further research is needed to understand the environmental fate and impact of nano-enabled product formulations.
ENVIRONMENTAL SCIENCE-NANO
(2021)
Article
Chemistry, Multidisciplinary
Dongqing Wang, Yuehui Liu, Nelson Rowell, Shanling Wang, Chunchun Zhang, Meng Zhang, Chaoran Luan, Kui Yu
Summary: Colloidal semiconductor II-VI metal chalcogenide (ME) magic-size clusters (MSCs) exhibit either a single or double optical absorption. PL-inactive CdS MSC-322 transforms into PL-active CdS MSC-328 and MSC-373 in the presence of acetic acid (HOAc). The transformation process involves monomer substitution for PC-322 to PC-328 and monomer addition for PC-328 to PC-373.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Dandan Rao, Jie Chen, Hongyu Dong, Junlian Qiao, Baoxue Zhou, Yuankui Sun, Xiaohong Guan
Summary: Using calcium sulfite as a slow-release source of sulfur dioxide, the effective working pH range of permanganate activation by sodium sulfite was extended from <= 7.0 to <= 9.0. The presence of calcium ions in the system led to enhanced precipitation of manganese dioxide, resulting in very low residual manganese levels. The Mn(VII)/CaSO3 system demonstrated a unique two-stage oxidation process with improved understanding of reaction kinetics and reactive oxidants.
Article
Environmental Sciences
Katarina Zivancevic, Katarina Baralic, Dragica Jorgovanovic, Aleksandra Buha Djordjevic, Marijana Curcic, Evica Antonijevic Miljakovic, Biljana Antonijevic, Zorica Bulat, Danijela Dukic-Cosic
Summary: This study utilized in silico toxicogenomic analysis to investigate the impact of environmentally relevant toxic metals on the molecular mechanisms of neurodegenerative diseases, specifically ALS, PD and AD. The results demonstrated common genes and disrupted pathways associated with these diseases, highlighting the role of oxidative stress and providing new insights into their pathology.
ENVIRONMENTAL RESEARCH
(2021)
Article
Geochemistry & Geophysics
Marzia Miletto, Xiangli Wang, Noah J. Planavsky, George W. Luther, Timothy W. Lyons, Bradley M. Tebo
Summary: Stable chromium isotopes have been used as a paleoredox proxy to track atmospheric oxygenation, with previous belief that Cr oxidation is limited to terrestrial settings. However, recent research shows rapid marine Cr(III) oxidation linked to microbial Mn(II) oxidation, challenging the traditional view. Initial partial oxidation of Cr(III) to Cr(VI) can cause a small isotope fractionation, calling for a reevaluation of the link between Cr isotope values and atmospheric oxygenation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
George W. Luther III, Jennifer S. Karolewski, Kevin M. Sutherland, Colleen M. Hansel, Scott D. Wankel
Summary: Recent studies have revealed the potential interaction between Mn and nitrogen species, shedding light on the abiotic oxidation mechanism of nitrite by Mn(III)-pyrophosphate under environmentally relevant conditions. The reaction involves two one-electron transfer steps and shows that nitrous acid serves as the reductant in the process, leading to the formation of nitrate as the end-product. This work provides a mechanistic perspective on the important relationship between Mn and nitrogen in environmental settings.
AQUATIC GEOCHEMISTRY
(2021)
Article
Oceanography
Coral Diaz-Recio Lorenzo, Daisy ter Bruggen, George W. Luther, Amy Gartman, Sabine Gollner
Summary: The study investigated the abundance and diversity of copepods associated with foundation species in different physiochemical environments at the active vent site ABE, finding that species richness and Shannon diversity were significantly higher in the Bathymodiolus habitat with lower temperatures, sulfur concentrations, and higher oxygen levels, driven by a community comprised mostly of habitat generalists.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Engineering, Environmental
Nanqing Zhou, George W. Luther, Clara S. Chan
Summary: This study quantified biotic and abiotic Fe(II) oxidation rates using a model microaerophilic Fe(II)-oxidizing bacterium in the presence of different organic ligands. Results showed that various models and natural iron-binding ligands have distinct effects on abiotic versus biotic Fe(II) oxidation rates. Organic ligands such as citrate and NTA were found to have different effects on the oxidation rates.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Editorial Material
Geosciences, Multidisciplinary
George W. Luther
Summary: Based on the C-14 data, the study confirms that dissolved organic carbon (DOC) in the deep ocean is over 6,000 years old and primarily originates from seawater passing through the ocean crust and expelling from hydrothermal vents. However, the chemical composition of this refractory DOC remains unknown, requiring collective efforts from the marine organic chemistry community to elucidate it.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
George W. Luther, Katherine M. Mullaugh, Emily J. Hauser, Kevin J. Rader, Dominic M. Di Toro
Summary: The study discusses the dissolved chemical speciation of metals in natural waters and methods to investigate metal organic ligand complexes. Competitive ligand exchange-cathodic stripping voltammetry titrations and pseudovoltammetry provide information about metal-ligand complexes. Kinetic experiments combined with the addition of competitive ligands offer insights into the dissociation rate constant and conditional equilibrium constant of the unknown metal-ligand complexes.
Article
Geochemistry & Geophysics
Khoren Avetisyan, Irina Zweig, George W. Luther, Alexey Kamyshny Jr
Summary: This study investigated the formation rates of hydrogen sulfide oxidation products by delta-MnO2 under environmentally-relevant conditions, revealing the distribution characteristics of specific sulfur states in the initial stage of polysulfides formation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Multidisciplinary Sciences
Timothy J. Shaw, George W. Luther, Richard Rosas, Veronique E. Oldham, Nicole R. Coffey, John L. Ferry, Dewamunnage M. C. Dias, Mustafa Yucel, Aubin Thibault de Chanvalon
Summary: Historically, the production of reactive oxygen species (ROS) in the ocean has been attributed to photochemical and biochemical reactions. However, hydrothermal vents emit globally significant inventories of reduced Fe and S species that react rapidly with oxygen in bottom water, serving as a previously unmeasured source of ROS. The Fe-catalyzed oxidation of reduced sulfur species in hydrothermal vent plumes in the deep oceans supports the abiotic formation of ROS at concentrations 20 to 100 times higher than those in surface waters. This plume-generated ROS can alter refractory organic molecules in seawater and potentially affect global ocean carbon inventories.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Emily R. Estes, Debora Berti, Alyssa J. Findlay, Michael F. Hochella, Timothy J. Shaw, Mustafa Yucel, Eric H. De Carlo, George W. Luther
Summary: Extensive sampling at the East Pacific Rise hydrothermal vent field showed that mixing of vent fluid with seawater results in the formation of nanoparticulate phases and the rapid precipitation/aggregation of metal sulfide minerals. Iron speciation and transport is decoupled from that of copper and zinc. Zinc and copper sulfide phases form nano-sized particles that can be easily removed by filtration, while iron sulfides exist as larger particles. Formation of pyrite nanoparticles is influenced by physical mixing and temperature. pH and zero point of charge of metal sulfides control particle formation and aggregation. Trace metal concentrations vary between vent sites, highlighting the importance of diffuse flow systems in hydrothermal metal emissions. The behavioral differences near the vents have implications for long-distance transport of metals.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Engineering, Environmental
Jeffrey M. Hudson, George W. Luther, Yu-Ping Chin
Summary: This study used mediated electrochemical oxidation to directly measure the extent of Fe(II) oxidation in the presence of different organic ligands, and obtained the apparent standard redox potentials and stability constant ratios of Fe(III)/Fe(II). The experimental results showed that different ligands had different effects on the reactivity of Fe(II), which is of great significance for understanding the role of Fe(II) in biogeochemical processes and contaminant attenuation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ke Wen, Oliver A. Chadwick, Peter M. Vitousek, Elizabeth L. Paulus, Gautier Landrot, Ryan V. Tappero, John P. Kaszuba, George W. Luther, Zimeng Wang, Benjamin J. Reinhart, Mengqiang Zhu
Summary: Manganese oxidation states in highly weathered volcanic soils in Hawaii were studied across two rainfall gradients. It was found that as the mean annual precipitation increased, the soil redox conditions shifted from oxic to suboxic and to anoxic, resulting in decreased proportions of Mn(IV) and increased proportions of Mn(II). Mn(III), on the other hand, accumulated in soils with prevalent suboxic conditions at intermediate precipitation levels. The soil redox conditions and rainfall-driven leaching jointly controlled the concentration of exchangeable Mn(II) in soils.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Marine & Freshwater Biology
S. Fisher Gonski, William J. Ullman, D. Tye Pettay, Karl S. Booksh, Todd R. Martz, George W. Luther, Wei-Jun Cai
Summary: This study assessed the performance of Durafet-based sensors in estuarine waters and found dynamic errors in the temperature and salinity responses of the internal and external reference electrodes. The errors were primarily driven by tidal mixing and were corrected using a dynamic sensor response correction method. The results showed that salinity change was the strongest limiting factor for the reference electrode response.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Limnology
Aubin Thibault de Chanvalon, George W. W. Luther, Veronique E. Oldham, Bradley M. M. Tebo, Nicole R. R. Coffey, Timothy F. F. Shaw
Summary: We conducted a study in the Pacific Ocean at the East Pacific Rise to investigate the distribution of dissolved Mn from the surface to the hydrothermal vents. We found that dissolved Mn(III) bound to humic acid accounted for a significant portion of the total dissolved Mn, especially in the hydrothermal plume and at the redox boundaries. The stability and temporal variability of Mn(III)-humic acid highlight the importance of non-steady-state processes in the open ocean.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Review
Environmental Sciences
George W. W. Luther III
Summary: The transformation between iodate and iodide has attracted a lot of attention due to their dependency on oxygen concentration, which varies in the ocean. Reducing iodate to iodide is the controlling step in the reduction reaction sequence, while oxidizing iodide to iodate is the controlling step in the oxidation process. The reduction of iodate is more favorable than the reduction of nitrate at oceanic pH values, suggesting different reductants can affect the transformation.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Ecology
Aubin Thibault de Chanvalon, George W. Luther, Emily R. Estes, Jennifer Necker, Bradley M. Tebo, Jianzhong Su, Wei-Jun Cai
Summary: This study investigates the carbonate dynamics in the temperate Chesapeake Bay estuary during two summers. The results show that under oxygen-rich conditions, carbonate dissolution, primary production, and aerobic respiration explain the evolution of alkalinity versus dissolved inorganic carbon. In oxygen-depleted waters, a previously unreported increase in dissolved inorganic carbon per alkalinity production was observed, suggesting the involvement of Mn in the carbonate signature.
