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https://www.readbyqxmd.com/read/28230079/organic-pollution-of-rivers-combined-threats-of-urbanization-livestock-farming-and-global-climate-change
#1
Yingrong Wen, Gerrit Schoups, Nick van de Giesen
Organic pollution of rivers by wastewater discharge from human activities negatively impacts people and ecosystems. Without treatment, pollution control relies on a combination of natural degradation and dilution by natural runoff to reduce downstream effects. We quantify here for the first time the global sanitation crisis through its impact on organic river pollution from the threats of (1) increasing wastewater discharge due to urbanization and intensification of livestock farming, and (2) reductions in river dilution capacity due to climate change and water extractions...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28229194/screening-level-assessment-of-metal-concentrations-in-streambed-sediments-and-floodplain-soils-within-the-grand-lake-watershed-in-northeastern-oklahoma-usa
#2
Ean M Garvin, Cas F Bridge, Meredith S Garvin
Metal releases have been received by the Grand Lake watershed from the Tri-State Mining District (TSMD) since the mid 1800s. To address data gaps in metal distributions in the Oklahoma portion of the watershed, streambed sediment and floodplain soil was sampled on various streams. The <63-µm fraction was analyzed for Cd, Pb, and Zn concentrations by portable X-ray fluorescence spectroscopy and inductively coupled plasma-mass spectrometry. Mean metal concentration results at reference transects indicated that background sediment/soil concentrations for Cd, Pb, and Zn within the watershed were 0...
February 22, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28225777/linear-mixed-effects-models-to-describe-length-weight-relationships-for-yellow-croaker-larimichthys-polyactis-along-the-north-coast-of-china
#3
Qiuyun Ma, Yan Jiao, Yiping Ren
In this study, length-weight relationships and relative condition factors were analyzed for Yellow Croaker (Larimichthys polyactis) along the north coast of China. Data covered six regions from north to south: Yellow River Estuary, Coastal Waters of Northern Shandong, Jiaozhou Bay, Coastal Waters of Qingdao, Haizhou Bay, and South Yellow Sea. In total 3,275 individuals were collected during six years (2008, 2011-2015). One generalized linear model, two simply linear models and nine linear mixed effect models that applied the effects from regions and/or years to coefficient a and/or the exponent b were studied and compared...
2017: PloS One
https://www.readbyqxmd.com/read/28225117/gold-nanoparticles-and-the-corresponding-filter-membrane-as-chemosensors-and-adsorbents-for-dual-signal-amplification-detection-and-fast-removal-of-mercury-ii
#4
Gaosong Chen, Jun Hai, Hao Wang, Weisheng Liu, Fengjuan Chen, Baodui Wang
Nowadays, the development of a multifunction system for the simultaneous multiple signal amplification detection and fast removal of Hg(2+) remains a major challenge. Herein, we for the first time used gold nanoparticles (Au NPs) and the corresponding filter membrane as chemosensors and adsorbents for dual signal amplification detection and fast removal of Hg(2+). Such a system was based on the formation of gold amalgam and a gold amalgam-based reaction between rhodamine B (RhB) and NaBH4 with fluorescence and colorimetric sensing functions...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28222352/status-of-pharmaceuticals-in-african-water-bodies-occurrence-removal-and-analytical-methods
#5
REVIEW
Lawrence Mzukisi Madikizela, Nikita Tawanda Tavengwa, Luke Chimuka
In this review paper, the milestones and challenges that have been achieved and experienced by African Environmental Scientists regarding the assessment of water pollution caused by the presence of pharmaceutical compounds in water bodies are highlighted. The identification and quantification of pharmaceuticals in the African water bodies is important to the general public at large due to the lack of information. The consumption of pharmaceuticals to promote human health is usually followed by excretion of these drugs via urine or fecal matter due to their slight transformation in the human metabolism...
February 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28222351/the-land-morphology-approach-to-flood-risk-mapping-an-application-to-portugal
#6
N S Cunha, M R Magalhães, T Domingos, M M Abreu, C Küpfer
In the last decades, the increasing vulnerability of floodplains is linked to societal changes such as population density growth, land use changes, water use patterns, among other factors. Land morphology directly influences surface water flow, transport of sediments, soil genesis, local climate and vegetation distribution. Therefore, the land morphology, the land used and management directly influences flood risks genesis. However, attention is not always given to the underlying geomorphological and ecological processes that influence the dynamic of rivers and their floodplains...
February 16, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28220278/rhodamine-diaminomaleonitrile-conjugate-as-a-novel-colorimetric-fluorescent-sensor-for-recognition-of-cd-2-ion
#7
Perumal Sakthivel, Karuppannan Sekar, Gandhi Sivaraman, Subramanian Singaravadivel
Rhodamine diaminomaleonitrile linked probe (RD-1) shows highly sensitive colorimetric and selective turn-on fluorescent response to Cd(2+) over other metal ions. The fluorescence intensity and absorbance of the probe RD-1 showed a good linearity, with very low detection limits of 18.5 nm. The probe RD-1 was preliminarily applied to the determination of Cd(2+) ion in water samples from river and tap water with satisfying results. The live cell image confocal microscopy, HeLa cell demonstrated that RD-1 had low cytotoxicity with good membrane permeable property is successfully applied to fluorescence microscopic imaging for the detection of Cd(2+) ions...
February 21, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28219247/addressing-analytical-challenges-of-the-environmental-monitoring-for-the-water-framework-directive-erm-ce100-a-new-biota-certified-reference-material
#8
Ioannis Dosis, Marina Ricci, Laszlo Majoros, Roberto Lava, Håkan Emteborg, Andrea Held, Hendrik Emons
In the context of supporting the EU Member States in the implementation of the EU Water Framework Directive (WFD), a project for the production of a fish reference material (ERM-CE100) certified for its content of the two priority substances hexachlorobenzene (HCB) and hexachlorobutadiene (HCBD) was carried out at the Joint Research Centre (JRC) of the European Commission. The starting material was naturally contaminated Wels catfish (Silurus glanis), caught in the Ebro River (Spain). A novel approach for the processing of the fish was tested that resulted in a homogeneous and stable reference material in the form of a wet paste...
February 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28218520/alteration-of-the-copper-binding-capacity-of-iron-rich-humic-colloids-during-transport-from-peatland-to-marine-waters
#9
Francois Muller, Marco Cuscov
Blanket bogs contain vast amounts of Sphagnum-derived organic substances which can act as powerful chelators for dissolved iron and thus enhance its export to the coastal ocean. To investigate the variations in quantity and quality of these exports, adsorptive cathodic stripping voltammetry (CSV) was used to characterise the metal binding properties of molecular weight-fractionated dissolved organic matter (MW-fractionated DOM) in the catchment and coastal plume of a small peat-draining river over a seasonal cycle...
February 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28217112/antibiotic-resistant-extended-spectrum-%C3%A3-lactamase-and-plasmid-mediated-ampc-producing-enterobacteriaceae-isolated-from-retail-food-products-and-the-pearl-river-in-guangzhou-china
#10
Qinghua Ye, Qingping Wu, Shuhong Zhang, Jumei Zhang, Guangzhu Yang, Huixian Wang, Jiahui Huang, Mongtong Chen, Liang Xue, Juan Wang
We conducted a survey in 2015 to evaluate the presence of extended spectrum β-lactamase (ESBL)- and plasmid-mediated AmpC-producing Enterobacteriaceae in retail food and water of the Pearl River in Guangzhou, China, as well as their antibiotic resistance profiles. Samples (88 fresh food samples and 43 water samples) from eight different districts were analyzed by direct plating and after enrichment. Multidrug-resistant strains were found in 41.7 and 43.4% of food and water samples, respectively. ESBLs were found in 3...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28216136/arsenic-speciation-in-the-lower-athabasca-river-watershed-a-geochemical-investigation-of-the-dissolved-and-particulate-phases
#11
Mark W Donner, Muhammad Babar Javed, William Shotyk, Kevin A Francesconi, Tariq Siddique
Human and ecosystem health concerns for arsenic (As) in the lower Athabasca River downstream of Athabasca Bituminous Sands (ABS) mining (Alberta, Canada) prompted an investigation to determine its forms in surface and groundwater upstream and downstream of industry. Dissolved As species, together with total and particulate As, were used to evaluate the potential bioavailability of As in water as well as to decipher inputs from natural geological processes and ABS mining and upgrading activities. Water samples were collected from the river in October at 13 locations in 2014 and 19 locations in 2015, spanning up to 125 km...
February 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28216093/apparent-interspecific-transmission-of-aphanomyces-astaci-from-invasive-signal-to-virile-crayfish-in-a-sympatric-wild-population
#12
J James, A Mrugała, B Oidtmann, A Petrusek, J Cable
The crayfish plague pathogen (Aphanomyces astaci) causes mass mortalities of European crayfish when transmitted from its original North American crayfish hosts. Little is known, however, about interspecific transmission of the pathogen between different American crayfish species, although evidence from trade of ornamental crayfish suggests this may happen in captivity. We screened signal and virile crayfish for A. astaci at allopatric and sympatric sites in a UK river. Whilst the pathogen was detected in signal crayfish from both sites, infected virile crayfish were only found in sympatry...
February 16, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28215865/triple-trouble-invasive-poeciliid-fishes-carry-the-introduced-tilapia-pathogen-gyrodactylus-cichlidarum-in-the-mexican-highlands
#13
Adriana García-Vásquez, Ulises Razo-Mendivil, Miguel Rubio-Godoy
As part of ongoing surveys of the gyrodactylid parasite fauna of freshwater fishes in Mexico, we recorded the infection of three species of poeciliids (Poecilia mexicana, Poeciliopsis gracilis, and Pseudoxiphophorus bimaculatus [syn.=Heterandria bimaculata]) with Gyrodactylus cichlidarum, a monogenean parasite of cichlid fishes, which has been co-introduced globally with its translocated, African "tilapia" hosts. This tilapia pathogen was found on poeciliid fishes both within their native distribution range in the Gulf of Mexico slope, as well as on invasive species artificially introduced to the Mexican highlands, to rivers draining into the Pacific Ocean...
February 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28215613/examining-the-utility-of-coral-ba-ca-as-a-proxy-for-river-discharge-and-hydroclimate-variability-at-coiba-island-gulf-of-chirqu%C3%A3-panam%C3%A3
#14
Logan D Brenner, Braddock K Linsley, Robert B Dunbar
Panamá's extreme hydroclimate seasonality is driven by Intertropical Convergence Zone rainfall and resulting runoff. River discharge (Q) carries terrestrially-derived barium to coastal waters that can be recorded in coral. We present a Ba/Ca record (1996-1917) generated from a Porites coral colony in the Gulf of Chiriquí near Coiba Island (Panamá) to understand regional hydroclimate. Here coral Ba/Ca is correlated to instrumental Q (R=0.67, p<0.001), producing a seasonally-resolved Reduced Major Axis regression of Ba/Ca (μmol/mol)=Q (m(3)/s)×0...
February 15, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28214119/persistent-organic-pollutants-in-the-olifants-river-basin-south-africa-bioaccumulation-and-trophic-transfer-through-a-subtropical-aquatic-food-web
#15
Vera Verhaert, Nadine Newmark, Wendy D'Hollander, Adrian Covaci, Wynand Vlok, Victor Wepener, Abraham Addo-Bediako, Antoinette Jooste, Johannes Teuchies, Ronny Blust, Lieven Bervoets
This study investigates the trophic transfer of persistent organic pollutants (POPs: PCBs, PBDEs, OCPs and PFASs) in the subtropical aquatic ecosystem of the Olifants River Basin (South Africa) by means of trophic magnification factors (TMFs). Relative trophic levels were determined by stable isotope analysis. POP levels in surface water, sediment and biota were low. Only ∑DDTs levels in fish muscle (<LOQ-61ng/g ww) were comparable or higher than values from other temperate and tropical regions. Significant positive relationships between relative trophic level and PCB, DDT and HCH concentrations were observed so trophic levels play an important role in the movement of contaminants through the food web...
February 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28213766/microelectrophoretic-study-of-environmentally-induced-dna-damage-in-fish-and-its-use-for-early-toxicity-screening-of-freshwater-bodies
#16
Bilal Hussain, Tayyaba Sultana, Salma Sultana, K A Al-Ghanim, Shahreef Masood, Muhammad Ali, Shahid Mahboob
This study investigates the potential of the comet and micronucleus assays of fish DNA as a means of screening the toxicity of aquatic environments. Catla catla and Cirrhinus mrigala collected from the River Chenab in Pakistan were used as a case study for the application of comet and micronucleus techniques. Comet and micronucleus assays were used to compare DNA damage in C. catla and C. mrigala collected from polluted areas of the River Chenab and farmed fish. Atomic absorption spectrophotometry showed an acute level of toxicity from Cd, Cu, Mn, Zn, Pb, Cr, Sn, and Hg in river water...
March 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28213707/hydropower-reservoirs-cytotoxic-and-genotoxic-assessment-using-the-allium-cepa-root-model
#17
Cassiano Lazarotto Rambo, Patrícia Zanotelli, Daniela Dalegrave, Dinara De Nez, Jozimar Szczepanik, Fábio Carazek, Francini Franscescon, Denis Broock Rosemberg, Anna Maria Siebel, Jacir Dal Magro
Hydropower offers a reliable source of electricity in several countries, and Brazil supplies its energy needs almost entirely through hydropower plants. Nevertheless, hydropower plants comprise large buildings and water reservoirs and dams, resulting in huge ecological disruptions. Here, we analyzed the impact of four hydropower reservoirs construction in metals and pesticides incidence and the cytotoxic and genotoxic potential of sediment elutriate of rivers from southern Brazil. Our analyses have evidenced the elevated incidence of different metals (lead, iron, cadmium, and chrome) and pesticides (methyl parathion, atrazine, and 2,4-dichlorophenoxyacetic acid)...
February 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28213127/quantitation-of-lead-210-210-pb-using-lead-203-203-pb-as-a-massless-yield-tracer
#18
D May, A N Nelson, M K Schultz
Determination of Pb-210 ((210)Pb) in aqueous solution is a common radioanalytical challenge in environmental science. Widely used methods for undertaking these analyses (e.g., ASTM D7535) rely on the use of stable lead (Pb) as a yield tracer that takes into account losses of (210)Pb that inevitably occur during elemental/radiochemical separations of the procedures. Although effective, these methods introduce technical challenges that can be difficult to track and potentially introduce uncertainty that can be difficult to quantify...
February 14, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28210946/an-online-spe-lc-ms-ms-method-for-the-analysis-of-antibiotics-in-environmental-water
#19
Meierjohann Axel, Kortesmäki Ewelina, Brozinski Jenny-Maria, Kronberg Leif
A fast and simple method for the analysis of 17 commonly used antibiotics in Finland in water samples was developed. The method combines online solid phase extraction using a reusable online trapping column combined with analytical separation on a C18 analytical column and detection by a triple quadrupole mass spectrometer. The method was fully validated for detection and quantification limits as well as linearity, repeatability, and matrix effects. The method gave an excellent linear response (r (2) > 0...
February 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28210755/assessment-of-quinoxyfen-phototransformation-pathways-by-liquid-chromatography-coupled-to-accurate-mass-spectrometry
#20
Priscila Ferri, María Ramil, Isaac Rodríguez, Rosângela Bergamasco, Angélica Marquetotti Salcedo Vieira, Rafael Cela
Quinoxyfen has been recently identified as a priority hazardous substance in the field of the European water policy. In this work, its fate in aqueous samples and solid supports under UV and solar radiation is investigated. Diverse degradation experiments were carried out, at lab scale, using spiked aliquots of different aqueous matrices (ultrapure, treated wastewater and river water) irradiated at different wavelengths (λ = 254 nm, λ = 365 nm and solar light). Half-lives of quinoxyfen (2-26 min) depended on the wavelength and the intensity of radiation whilst the nature of the aqueous matrix did not play an important role in degradation kinetics...
February 16, 2017: Analytical and Bioanalytical Chemistry
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