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https://www.readbyqxmd.com/read/28918279/seasonal-variation-of-chloro-s-triazines-in-the-hartbeespoort-dam-catchment-south-africa
#1
Cornelius Rimayi, David Odusanya, Jana M Weiss, Jacob de Boer, Luke Chimuka
Seasonal variation of eight chloro-s-triazine herbicides and seven major atrazine and terbuthylazine degradation products was monitored in the Hartbeespoort Dam catchment using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS/MS). Lake, river and groundwater were sampled from the Hartbeespoort Dam catchment over four seasons and the downstream Jukskei River was monitored during the winter season. Triazine herbicide concentrations in the Hartbeespoort Dam were in the order atrazine>simazine>propazine>ametryn>prometryn throughout the four seasons sampled...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28918084/uranium-isotopes-in-tree-bark-as-a-spatial-tracer-of-environmental-contamination-near-former-uranium-processing-facilities-in-southwest-ohio
#2
Elise Conte, Elisabeth Widom, David Kuentz
Inappropriate handling of radioactive waste at nuclear facilities can introduce non-natural uranium (U) into the environment via the air or groundwater, leading to anthropogenic increases in U concentrations. Uranium isotopic analyses of natural materials (e.g. soil, plants or water) provide a means to distinguish between natural and anthropogenic U in areas near sources of radionuclides to the environment. This study examines the utility of two different tree bark transects for resolving the areal extent of U atmospheric contamination using several locations in southwest Ohio that historically processed U...
September 14, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28918079/clogging-of-an-alpine-streambed-by-silt-sized-particles-insights-from-laboratory-and-field-experiments
#3
Jasmin Fetzer, Markus Holzner, Michael Plötze, Gerhard Furrer
Clogging of streambeds by suspended particles (SP) can cause environmental problems, as it can negatively influence, e.g., habitats for macrozoobenthos, fish reproduction and groundwater recharge. This especially applies in the case of silt-sized SP. Until now, most research has dealt with coarse SP and was carried out in laboratory systems. The aims of this study are to examine (1) whether physical clogging by silt-sized SP exhibits the same dynamics and patterns as by sand-sized SP, and (2) the comparability of results between laboratory and field experiments...
September 7, 2017: Water Research
https://www.readbyqxmd.com/read/28916282/chlorate-origin-and-fate-in-shallow-groundwater-below-agricultural-landscapes
#4
Micòl Mastrocicco, Dario Di Giuseppe, Fabio Vincenzi, Nicolò Colombani, Giuseppe Castaldelli
In agricultural lowland landscapes, intensive agricultural is accompanied by a wide use of agrochemical application, like pesticides and fertilizers. The latter often causes serious environmental threats such as N compounds leaching and surface water eutrophication; additionally, since perchlorate can be present as impurities in many fertilizers, the potential presence of perchlorates and their by-products like chlorates and chlorites in shallow groundwater could be a reason of concern. In this light, the present manuscript reports the first temporal and spatial variation of chlorates, chlorites and major anions concentrations in the shallow unconfined aquifer belonging to Ferrara province (in the Po River plain)...
September 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28916278/microbial-reduction-of-vanadium-v-in-groundwater-interactions-with-coexisting-common-electron-acceptors-and-analysis-of-microbial-community
#5
Hui Liu, Baogang Zhang, Heyang Yuan, Yutong Cheng, Song Wang, Zhen He
Vanadium (V) pollution in groundwater has posed serious risks to the environment and public health. Anaerobic microbial reduction can achieve efficient and cost-effective remediation of V(V) pollution, but its interactions with coexisting common electron acceptors such as NO3(-), Fe(3+), SO4(2-) and CO2 in groundwater remain unknown. In this study, the interactions between V(V) reduction and reduction of common electron acceptors were examined with revealing relevant microbial community and identifying dominant species...
September 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28915932/evaluation-of-meiofauna-in-the-hyporheic-zone-of-the-beberibe-river-pernambuco-brazil
#6
(no author information available yet)
The hyporheic environment is composed of a rich meiofauna that depends on the water flow, organic matter and oxygen. The concentration of meiofauna varies spatially (horizontal and vertical) and temporally. Several processes occur at this interface (groundwater and surface water), including biogeochemical processes involving meiofauna. A study on the hyporheic meiofauna community was conducted in sediments of Beberibe River, in Brazil. Meiofauna attained peak densities of 942.8 organisms / 10 cm2, with organisms being distributed over six taxa with 98% of them represented by rotifers, nematodes and annelids...
September 14, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28915544/mobilisation-of-toxic-trace-elements-under-various-beach-nourishments
#7
Iris R Pit, Stefan C Dekker, Tobias J Kanters, Martin J Wassen, Jasper Griffioen
To enhance protection and maintain wide beaches for recreation, beaches are replenished with sand: so-called beach nourishments. We compared four sites: two traditional beach nourishments, a mega beach nourishment and a reference without beach nourishment. Two sites contain calcareous-rich sand, whereas the other two sites have calcareous-poor sand. We aimed to understand hydrogeochemical processes to indicate factors critical for the mobility of trace elements at nourishments. We therefore analysed the chemical characteristics of sediment and pore water to ascertain the main drivers that mobilise toxic trace elements...
September 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28915476/microbial-remediation-of-fluoride-contaminated-water-via-a-novel-bacterium-providencia-vermicola-kx926492
#8
Shraboni Mukherjee, Priyanka Sahu, Gopinath Halder
The present study emphasizes on the isolation, identification and characterization of a fluoride-resistant bacteria from contaminated groundwater of a severely affected rural area. The isolate was investigated for its possible role towards bioremediation of fluoride. Bacterial growth was determined by various carbon and nitrogen sources. Influence of parameters like initial fluoride concentration (5-25 mg L(-1)), pH (3-9) and temperature (15-42 °C) on fluoride removal by Providencia sp. KX926492 were also examined...
September 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28915473/endocrine-disrupting-compounds-in-streams-in-israel-and-the-palestinian-west-bank-implications-for-transboundary-basin-management
#9
Pniela Dotan, Maayan Yeshayahu, Wa'd Odeh, Nina Gordon-Kirsch, Ludmila Groisman, Nader Al-Khateeb, Alfred Abed Rabbo, Alon Tal, Shai Arnon
Endocrine disrupting compounds (EDCs) frequently enter surface waters via discharges from wastewater treatment plants (WWTPs), as well as from industrial and agricultural activities, creating environmental and health concerns. In this study, selected EDCs were measured in water and sediments along two transboundary streams flowing from the Palestinian Authority (PA) into Israel (the Zomar-Alexander and Hebron-Beer Sheva Streams). We assessed how the complicated conflict situation between Israel and the PA and the absence of a coordinated strategy and joint stream management commission influence effective EDC control...
September 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28915458/physical-water-scarcity-metrics-for-monitoring-progress-towards-sdg-target-6-4-an-evaluation-of-indicator-6-4-2-level-of-water-stress
#10
REVIEW
D Vanham, A Y Hoekstra, Y Wada, F Bouraoui, A de Roo, M M Mekonnen, W J van de Bund, O Batelaan, P Pavelic, W G M Bastiaanssen, M Kummu, J Rockström, J Liu, B Bisselink, P Ronco, A Pistocchi, G Bidoglio
Target 6.4 of the recently adopted Sustainable Development Goals (SDGs) deals with the reduction of water scarcity. To monitor progress towards this target, two indicators are used: Indicator 6.4.1 measuring water use efficiency and 6.4.2 measuring the level of water stress (WS). This paper aims to identify whether the currently proposed indicator 6.4.2 considers the different elements that need to be accounted for in a WS indicator. WS indicators compare water use with water availability. We identify seven essential elements: 1) both gross and net water abstraction (or withdrawal) provide important information to understand WS; 2) WS indicators need to incorporate environmental flow requirements (EFR); 3) temporal and 4) spatial disaggregation is required in a WS assessment; 5) both renewable surface water and groundwater resources, including their interaction, need to be accounted for as renewable water availability; 6) alternative available water resources need to be accounted for as well, like fossil groundwater and desalinated water; 7) WS indicators need to account for water storage in reservoirs, water recycling and managed aquifer recharge...
September 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28915454/assessing-the-potential-contributions-of-additional-retention-processes-to-pfas-retardation-in-the-subsurface
#11
Mark L Brusseau
A comprehensive understanding of the transport and fate of per- and poly-fluoroalkyl substances (PFAS) in the subsurface is critical for accurate risk assessments and design of effective remedial actions. A multi-process retention model is proposed to account for potential additional sources of retardation for PFAS transport in source zones. These include partitioning to the soil atmosphere, adsorption at air-water interfaces, partitioning to trapped organic liquids (NAPL), and adsorption at NAPL-water interfaces...
September 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28914824/use-of-principal-components-analysis-and-kriging-to-predict-groundwater-sourced-rural-drinking-water-quality-in-saskatchewan
#12
Lianne McLeod, Lalita Bharadwaj, Tasha Epp, Cheryl L Waldner
Groundwater drinking water supply surveillance data were accessed to summarize water quality delivered as public and private water supplies in southern Saskatchewan as part of an exposure assessment for epidemiologic analyses of associations between water quality and type 2 diabetes or cardiovascular disease. Arsenic in drinking water has been linked to a variety of chronic diseases and previous studies have identified multiple wells with arsenic above the drinking water standard of 0.01 mg/L; therefore, arsenic concentrations were of specific interest...
September 15, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28914537/coupling-bioflocculation-of-dehalococcoides-mccartyi-to-high-rate-reductive-dehalogenation-of-chlorinated-ethenes
#13
Anca G Delgado, Devyn Fajardo-Williams, Emily Bondank, Sofia Esquivel-Elizondo, Rosa Krajmalnik-Brown
Continuous bioreactors operated at low hydraulic retention times have rarely been explored for reductive dehalogenation of chlorinated ethenes. The inability to consistently develop such bioreactors affects the way growth approaches for Dehalococcoides mccartyi bioaugmentation cultures are envisioned. It also affects interpretation of results from in situ continuous treatment processes. We report bioreactor performance and dehalogenation kinetics of a D. mccartyi-containing consortium in an upflow bioreactor...
September 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28913810/effect-of-nanoscale-zero-valent-iron-confined-in-mesostructure-on-escherichia-coli
#14
Xia Sun, Yubo Yan, Mingyan Wang, Zhaoxiang Han
Nanoscale zero-valent iron particles (NZVIs) confined in the mesochannels of SBA-15 have superabilities in the remediation of contaminated groundwater. As a new kind of remediation nanomaterials, it is necessary to investigate the ecotoxicity of NZVIs/SBA-15 composites during their applications. In this study, we evaluated the toxicity of NZVIs/SBA-15 on Escherichia coli and proposed a possible mechanism. Compared with the bare NZVIs and SBA-15 surface-supported NZVIs at the same equivalent concentration of NZVIs (0...
September 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28913678/comparison-of-point-source-pollutant-loadings-to-soil-and-groundwater-for-72-chemical-substances
#15
Soonyoung Yu, Sang-Il Hwang, Seong-Taek Yun, Gitak Chae, Dongsu Lee, Ki-Eun Kim
Fate and transport of 72 chemicals in soil and groundwater were assessed by using a multiphase compositional model (CompFlow Bio) because some of the chemicals are non-aqueous phase liquids or solids in the original form. One metric ton of chemicals were assumed to leak in a stylized facility. Scenarios of both surface spills and subsurface leaks were considered. Simulation results showed that the fate and transport of chemicals above the water table affected the fate and transport of chemicals below the water table, and vice versa...
September 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28913587/isotopic-effects-of-pce-induced-by-organohalide-respiring-bacteria
#16
Simon Leitner, Harald Berger, Markus Gorfer, Thomas G Reichenauer, Andrea Watzinger
Reductive dechlorination performed by organohalide-respiring bacteria (OHRB) enables the complete detoxification of certain emerging groundwater pollutants such as perchloroethene (PCE). Environmental samples from a contaminated site incubated in a lab-scale microcosm (MC) study enable documentation of such reductive dechlorination processes. As compound-specific isotope analysis is used to monitor PCE degradation processes, nucleic acid analysis-like 16S-rDNA analysis-can be used to determine the key OHRB that are present...
September 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28910852/origin-and-evolution-of-aquitard-porewater-in-the-western-coastal-plain-of-bohai-bay-china
#17
Jing Li, Xing Liang, Menggui Jin, Jilong Yang, Bin Ma, Qin Ge
High-salinity paleowater from low-permeability aquitards in coastal areas can be a major threat to groundwater resources; however, such water has rarely been studied. The chemical and isotopic compositions of porewater extracted from a 200-m-thick Quaternary sedimentary sequence in the western coastal plain of Bohai Bay, China, were analyzed to investigate the salinity origin and chemical evolution of porewater in aquitards. Porewater samples derived at depths shallower than 32 m are characterized by Cl-Na type saline water (total dissolved solids [TDS], 10...
September 14, 2017: Ground Water
https://www.readbyqxmd.com/read/28903082/hesperidin-a-citrus-bioflavonoid-alleviates-trichloroethylene-induced-oxidative-stress-in-drosophila-melanogaster
#18
Amos Olalekan Abolaji, Oluwatoyin Victoria Babalola, Abimbola Kehinde Adegoke, Ebenezer Olatunde Farombi
Trichloroethylene (TCE) is a chlorinated organic pollutant of groundwater with diverse toxic effects in animals and humans. Here, we investigated the ameliorative role of hesperidin, a citrus bioflavonoid on TCE-induced toxicity in Drosophila melanogaster. Four groups of D. melanogaster (50 flies/vial, with 5 vials/group) were exposed to ethanol (2.5%, control), HSP (400mg/10g diet), TCE (10μM/10g diet) and TCE (10μM/10g diet)+HSP (400mg/10g diet) respectively in the diet for 5days. Then, selected oxidative stress and antioxidant markers were evaluated...
September 1, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28902992/removal-of-antibiotic-florfenicol-by-sulfide-modi%C3%AF-ed-nanoscale-zero-valent-iron
#19
Zhen Cao, Xue Liu, Jiang Xu, Jing Zhang, Yi Yang, Jun Liang Zhou, Xinhua Xu, Gregory V Lowry
Florfenicol (FF, C12H14Cl2FNO4S), an emerging halogenated organic contaminant of concern was effectively degraded in water by sulfidized nanoscale zero-valent iron (S-nZVI). Sulfidized nZVI (62.5 m2 g-1) that was prepared using a one-step method resulted in small Fe0/Fe-sulfide particles that were more stable against aggregation than unsulfidized nZVI (10.2 m2 g-1). No obvious removal of FF was observed by unsulfidized nZVI. S-nZVI degraded FF, having a surface area normalized reaction rate constant of 3.1×10-4 L m-2 min-1...
September 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28902318/prevalence-of-dental-fluorosis-in-mexico-2005-2015-a-literature-review
#20
Fátima Del Carmen Aguilar-Díaz, Federico Morales-Corona, Aline Cristina Cintra-Viveiro, Javier de la Fuente-Hernández
Objective: To perform a literature review regarding current dental fluorosis prevalence in Mexico reported from 2005 to 2015. Materials and methods: A comprehensive scientific literature review, in both English and Spanish, was performed in four databases up to June 2015. Search terms: fluorosis or dental fluorosis (mesh), prevalence (mesh), distribution (mesh), cases (mesh), epidemiology (mesh), Mexico. Results: 17 publications were included...
May 2017: Salud Pública de México
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