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E González-Ortegón, V Amaral, F Baldó, Ricardo F Sánchez-Leal, María J Bellanco, María P Jiménez, J Forja, César Vilas, A Tovar-Sanchez
Dissolved organic matter (DOM) is a major component of the organic matter pool, playing a key role in the global ocean functioning. However, studies on DOM in waters of many ocean regions, such as the Gulf of Cadiz (GoC), are poorly known. Advanced aquatic sensors enable autonomous for long-term deployments in situ collection of high frequency DOM data using fluorescent dissolved organic matter (FDOM) as a proxy. The present study evaluates the relevance of FDOM, the estuarine influence and the environmental factors that determine its spatial distribution in the GoC...
March 7, 2018: Science of the Total Environment
Yujie He, Alette A M Langenhoff, Rob N J Comans, Nora B Sutton, Huub H M Rijnaarts
Natural dissolved organic matter (DOM) and nitrification can play an important role in biodegradation of pharmaceutically active compounds (PhACs) in aerobic zones of constructed wetlands (CWs). This study used an enrichment culture originating from CW sediment to study the effect of DOM and nitrification on aerobic biodegradation of seven PhACs. The enriched culture degraded caffeine (CAF), metoprolol (MET), naproxen (NAP), and ibuprofen (IBP) with a consistent biodegradability order of CAF>MET>NAP>IBP...
March 2, 2018: Science of the Total Environment
R Aharonov-Nadborny, L Tsechansky, M Raviv, E R Graber
Olive mill wastewater (OMWW) is an acidic, saline, and organic matter-rich aqueous byproduct of olive oil production that is usually disposed of by spreading on agricultural soils. This study tested whether spreading OMWW can release indigenous soil metals (Fe, Mn, Cu and Zn) through pH, redox, and DOM complexation-related mechanisms, using three agricultural soils having different textures and chemical properties, and controlled pH and redox conditions (pH5.6 or 8.4; ORP from -200 to +250mV). Comparison treatments included a solution having the same salt content and composition as OMWW but lacking OM, and deionized water (DW)...
March 1, 2018: Science of the Total Environment
J P R Sorensen, A Vivanco, M J Ascott, D C Gooddy, D J Lapworth, D S Read, C M Rushworth, J Bucknall, K Herbert, I Karapanos, L P Gumm, R G Taylor
We assessed the utility of online fluorescence spectroscopy for the real-time evaluation of the microbial quality of untreated drinking water. Online fluorimeters were installed on the raw water intake at four groundwater-derived UK public water supplies alongside existing turbidity sensors that are used to forewarn of the presence of microbial contamination in the water industry. The fluorimeters targeted fluorescent dissolved organic matter (DOM) peaks at excitation/emission wavelengths of 280/365 nm (tryptophan-like fluorescence, TLF) and 280/450 nm (humic-like fluorescence, HLF)...
March 3, 2018: Water Research
Huan He, Bin Huang, Gen Fu, Dan Xiong, Zhixiang Xu, Xinhao Wu, Xuejun Pan
The photochemical conversion and microbial transformation of pollutants mediated by dissolved organic matter (DOM), including 17α-ethinylestradiol (EE2), are often accompanied in natural water. However, there are few studies to explore the connection and mechanism between the two processes. This research aims to investigate the mechanism of DOM after electrochemically modification mediated EE2 combining photodegradation and biodegradation in the environment and it want to explain the natural phenomena of DOM after electrochemical advanced treatment entering the water environment mediated EE2 natural degradation...
March 12, 2018: Water Research
Aleicia Holland, Jenny Stauber, Chris M Wood, Melanie Trenfield, Dianne F Jolley
Dissolved organic matter (DOM) plays important roles in both abiotic and biotic processes within aquatic ecosystems, and these in turn depend on the quality of the DOM. We collected and characterized chromophoric DOM (CDOM) from different Australian freshwater types (circumneutral, naturally acidic and groundwater-fed waterways), climatic regions and seasons. CDOM quality was characterized using absorbance and fluorescence spectroscopy. Excitation emission scans followed by parallel factor (PARAFAC) analysis showed that CDOM was characterized by three main components: protein-like, fulvic-like and humic-like components commonly associated with various waters globally in the Openfluor database...
March 2, 2018: Water Research
Huihui Han, Hengfeng Miao, Yajing Zhang, Minfeng Lu, Zhenxing Huang, Wenquan Ruan
Disinfection byproduct (DBP) precursors in wastewater during the reversed anaerobic-anoxic-oxic (A2 /O) process, as well as their molecular weight (MW) and polarity-based fractions, were characterized with UV scanning, fluorescence excitation emission matrix, Fourier transform infrared and nuclear magnetic resonance spectroscopy. Their DBP formation potentials (DBPFPs) after chlorination were further tested. Results indicated that the reversed A2 /O process could not only effectively remove the dissolved organic carbon (DOC) and dissolved total nitrogen in the wastewater, but also affect the MW distribution and hydrophilic-hydrophobic properties of dissolved organic matter (DOM)...
March 2018: Journal of Environmental Sciences (China)
Ying Zhang, Ning Zhang, Peng Zhao, Zhiguang Niu
The characteristics of dissolved organic matter (DOM) and bromide ion concentration have a significant influence on the formation of disinfection by-products (DBPs). In order to identify the main DBP precursors, DOM was divided into five fractions based on molecular weight (MW), trihalomethane formation potential and haloacetic acid formation potential were determined for fractions, and the change in contents of different fractions and total DBPs during treatment processes (pre-chlorination, coagulation, sand filtration, disinfection) were studied...
March 2018: Journal of Environmental Sciences (China)
Marine Landa, Stéphane Blain, Jérôme Harmand, Sébastien Monchy, Alain Rapaport, Ingrid Obernosterer
In the Southern Ocean, natural iron fertilization in the wake of islands leads to annually occurring spring phytoplankton blooms associated with enhanced heterotrophic activity through the release of labile dissolved organic matter (DOM). The aim of this study was to investigate experimentally how diatom-derived DOM affects the composition of Southern Ocean winter water bacterial communities and to identify the most responsive taxa. A bacterial community collected in the naturally iron-fertilized region off Kerguelen Island (KEOPS2 October-November 2011) was grown onboard in continuous cultures, on winter water alone or amended with diatom-derived DOM supplied at identical DOC concentrations...
April 1, 2018: FEMS Microbiology Ecology
Bin Hua, John Yang, Fengjing Liu, Guocheng Zhu, Baolin Deng, Jingdong Mao
Characterization of dissolved organic matter/nitrogen (DOM/DON) is critical in water quality assessment and nutrient management in watershed or ecosystem. This study was to investigate the link between DOM/DON and its source using fluorescence excitation-emission matrix (EEM) spectroscopy coupled with parallel factor analysis (PARAFAC). Water samples were collected from various aquatic systems in a watershed located in central Missouri, including rural watershed with various land use and land cover (LULC), landfill, and constructed wetland...
March 6, 2018: Chemosphere
Qianyi Zhang, Evan G R Davies, James R Bolton, Yang Liu
Monochloramine (NH2 Cl) is widely used for secondary disinfection by water utilities. However, Edmonton field stormwater sampling results have shown that NH2 Cl, because of its long-lasting property, can cause stormwater contamination through outdoor potable water uses during the summer season. To protect water sources, it is important to understand NH2 Cl dissipation mechanisms in stormwater. Natural organic matter (NOM) is the dominant species that contributes to NH2 Cl decay in stormwater. In this research, it is proposed that NOM reacted with both NH2 Cl and free chlorine through rapid and long-term reactions during NH2 Cl dissipation...
March 12, 2018: Science of the Total Environment
Irena F Creed, Ann-Kristin Bergström, Charles G Trick, Nancy B Grimm, Dag O Hessen, Jan Karlsson, Karen A Kidd, Emma Kritzberg, Diane M McKnight, Erika C Freeman, Oscar E Senar, Agneta Andersson, Jenny Ask, Martin Berggren, Mehdi Cherif, Reiner Giesler, Erin R Hotchkiss, Pirkko Kortelainen, Monica M Palta, Tobias Vrede, Gesa A Weyhenmeyer
Northern ecosystems are experiencing some of the most dramatic impacts of global change on Earth. Rising temperatures, hydrological intensification, changes in atmospheric acid deposition and associated acidification recovery, and changes in vegetative cover are resulting in fundamental changes in terrestrial-aquatic biogeochemical linkages. The effects of global change are readily observed in alterations in the supply of dissolved organic matter (DOM) - the messenger between terrestrial and lake ecosystems - with potentially profound effects on the structure and function of lakes...
March 15, 2018: Global Change Biology
Sindhu Kancherla, Marianne Lorentzen, Victor Snieckus, Kåre Bredeli Jørgensen
A general method for the regioselective synthesis of a series of ortho-substituted chrysenyl N,N-diethyl-O-carbamates by the directed ortho metalation (DoM) strategy is reported. The starting O-carbamates were prepared from corresponding chrysenols, available by oxidative photochemical cyclization or directed remote metalation tactics. Chrysen-1-yl and chrysene-3-yl ring site selectivity of directed ortho metalation (DoM) and anionic ortho Fries rearrangement (AoF) protocols, with s-BuLi/TMEDA, followed by electrophilic quench using a selection of electrophiles, were observed leading to new chrysenyl derivatives...
March 15, 2018: Journal of Organic Chemistry
Lipeng Gu, Bin Huang, Chaochao Lai, Zhixiang Xu, Huan He, Xuejun Pan
Dissolved organic matter (DOM) is shown to act as an electron shuttle mediator which enhances the microbial degradation of steroid estrogens in natural water. Batch studies were conducted with 17β‑estradiol (E2), quinone-reducing bacteria, DOM, and Fe(III) as a terminal electron acceptor. The results show that anthraquinone‑2‑disulfonate (AQS) approximately doubles the microbial degradation of E2 by DOM alone. The effect decreases sharply at AQS concentrations above 1.0mmol·L-1 . Over three oxidation-reduction cycles, the electron-shuttling ability of AQS and the E2 biodegradation rate decreased step by step...
March 11, 2018: Science of the Total Environment
Geneviève Dom, Sandra Frank, Sebastien Floor, Pashalina Kehagias, Frederick Libert, Catherine Hoang, Guy Andry, Alex Spinette, Ligia Craciun, Nicolas de Saint Aubin, Christophe Tresallet, Frederique Tissier, Frederique Savagner, Samira Majjaj, Ilse Gutierrez-Roelens, Etienne Marbaix, Jacques E Dumont, Carine Maenhaut
Non-autonomous thyroid nodules are common in the general population with a proportion found to be cancerous. A current challenge in the field is to be able to distinguish benign adenoma (FA) from preoperatively malignant thyroid follicular carcinoma (FTC), which are very similar both histologically and genetically. One controversial issue, which is currently not understood, is whether both tumor types represent different molecular entities or rather a biological continuum. To gain a better insight into FA and FTC tumorigenesis, we defined their molecular profiles by mRNA and miRNA microarray...
February 13, 2018: Oncotarget
Jing Qi, Huachun Lan, Ruiping Liu, Huijuan Liu, Jiuhui Qu
The coagulation/flocculation/flotation (C/F/F) process is becoming a popular method for algae-laden water treatment. However, the efficiency of flotation is highly dependent on the ability of the preceding coagulation/flocculation process to form flocculated algae flocs. This study aims to improve the Microcystis aeruginosa flotation efficiency from algae cell and organic matter aspects by applying Fe(II)-regulated pretreatment enhanced Al coagulation process. The ability of the C/F/F process to remove cyanobacterial cells can be enhanced from 8% to 99% at a Fe(II) dose of 30 μM...
March 5, 2018: Water Research
Sen Zhang, Yu Yang, Satoshi Takizawa, Li-An Hou
This study investigated the pretreatment effect of ferrihydrite (FH) on the removal of dissolved organic matter (DOM) and membrane fouling control in a hybrid adsorption-ultrafiltration (UF) membrane system. Powdered activated carbon (PAC) was chosen for comparative study, and three surrogates, namely, humic acid (HA), sodium alginate (SA) and bovine serum albumin, were applied in feed water to simulate humic substances, polysaccharides and proteins, respectively. In the hybrid adsorption-membrane system, the impacts of adsorbent cake layers on DOM removal and membrane fouling were systematically investigated...
March 10, 2018: Science of the Total Environment
Laith Furatian, Madjid Mohseni
The 185 nm wavelength radiation generated by the conventional low pressure mercury lamp forms the basis of an advanced oxidation process (AOP) that does not require chemical addition. The photolysis of water by 185 nm photons generates the hydroxyl radical (OH) used to degrade trace organic contaminants. While AOPs in general suffer decreased efficiency in direct proportion to the concentrations of dissolved organic matter (DOM) and alkalinity (HCO3 - /CO3 2- ), acting as OH scavengers, such solutes impose an additional parasitic effect on the 185 nm AOP as absorbers of photons...
March 1, 2018: Chemosphere
Nathalie Coquillé, Dominique Ménard, Julien Rouxel, Valentin Dupraz, Mélissa Éon, Patrick Pardon, Hélène Budzinski, Soizic Morin, Édith Parlanti, Sabine Stachowski-Haberkorn
Microalgae, which are the foundation of aquatic food webs, may be the indirect target of herbicides used for agricultural and urban applications. Microalgae also interact with other compounds from their environment, such as natural dissolved organic matter (DOM), which can itself interact with herbicides. This study aimed to evaluate the influence of natural DOM on the toxicity of three herbicides (diuron, irgarol and S-metolachlor), singly and in ternary mixtures, to two marine microalgae, Chaetoceros calcitrans and Tetraselmis suecica, in monospecific, non-axenic cultures...
February 27, 2018: Aquatic Toxicology
Zhineng Hao, Yongguang Yin, Juan Wang, Dong Cao, Jingfu Liu
There are increasing concerns about the adverse effects of released engineered nanoparticles and photochemically formed organohalogen compounds (OHCs) on human health and the environment. Herein, we report that titanium dioxide nanoparticles (TiO2 NPs) can photocatalytically halogenate dissolved organic matter (DOM) to form a large number of organobromine compounds (OBCs) and organoiodine compounds (OICs), as characterized by negative ion electrospray ionization coupled with Fourier transform ion cyclotron resonance mass spectrometry...
March 7, 2018: Science of the Total Environment
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