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https://www.readbyqxmd.com/read/29149708/photodegradation-of-novel-oral-anticoagulants-under-sunlight-irradiation-in-aqueous-matrices
#1
Montaha Yassine, Laura Fuster, Marie-Hélène Dévier, Emmanuel Geneste, Patrick Pardon, Axelle Grélard, Erick Dufourc, Mohamad Al Iskandarani, Selim Aït-Aïssa, Jeanne Garric, Hélène Budzinski, Patrick Mazellier, Aurélien S Trivella
Kinetics of photodegradation of novel oral anticoagulants dabigatran, rivaroxaban, and apixaban were studied under simulated solar light irradiation in purified, mineral, and river waters. Dabigatran and rivaroxaban underwent direct photolysis with polychromatic quantum yields of 2.2 × 10(-4) and 4.4 × 10(-2), respectively. The direct photodegradation of apixaban was not observed after 19 h of irradiation. Kinetics of degradation of rivaroxaban was not impacted by the nature of the aqueous matrix while photosensitization from nitrate ions was observed for dabigatran and apixaban dissolved in a mineral water...
November 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/29148919/bacterial-flora-analysis-of-coliforms-in-sewage-river-water-and-ground-water-using-maldi-tof-mass-spectrometry
#2
Yoshihiro Suzuki, Kouki Niina, Tomonori Matsuwaki, Kei Nukazawa, Atsushi Iguchi
The aim of this study was to rapidly and effectively analyze coliforms, which are the most fundamental indicators of water quality for fecal pollution, using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). Coliform bacteria were isolated from municipal sewage, river water, and groundwater. For each sample, 100 isolates were determined by MALDI-TOF MS. In addition, these same 100 isolates were also identified via 16S rRNA gene sequence analysis. Obtained MALDI-TOF MS data were compared with the 16S rRNA sequencing analysis, and the validity of MALDI-TOF MS for classification of coliform bacteria was examined...
November 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29148733/fluorescence-and-quenching-assessment-eem-parafac-of-de-facto-potable-reuse-in-the-neuse-river-north-carolina-united-states
#3
Martha J M Wells, Gene A Mullins, Katherine Y Bell, Allegra K Da Silva, Eileen M Navarrete
The Neuse River, North Carolina, U.S., exemplifies a typical de facto potable reuse scenario, where drinking water sources are located downstream of treated wastewater effluent discharges. The study results imply that planned potable water reuse, whether in an indirect or direct potable reuse scenario, might provide better control over water quality than the status quo conditions. Using fluorescence excitation-emission matrix (EEM) measurements, anthropogenic influence of a wastewater treatment plant (WWTP) discharge was observed in samples near the location of drinking water treatment plant (WTP) intakes, eight or more miles downstream of the WWTP, implying that anthropogenic compounds were not fully removed or degraded by natural processes in this reach of the river...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29147789/erythrocyte-nuclear-abnormalities-in-astyanax-lacustris-in-response-to-landscape-characteristics-in-two-neotropical-streams
#4
Lucilene Finoto Viana, Yzel Rondon Súarez, Claudia Andrea Lima Cardoso, Julio César Jut Solórzano, Bruno do Amaral Crispim, Alexeia Barufatti Grisolia, Sidnei Eduardo Lima-Junior
The objective of this research was to evaluate land use and occupation in the landscape surrounding two neotropical streams of the Upper Paraná River in Brazil and to investigate if the water from these streams induces erythrocyte nuclear abnormalities in Astyanax lacustris. We observed that the areas surrounding the streams are predominantly used for agricultural purposes (73.46% of the total area), followed by buildings (15.21%). Only 8.78% of the area consisted of forest fragments. We observed higher frequencies of micronuclei in erythrocytes of A...
November 17, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29146201/arsenic-speciation-in-environmental-multimedia-samples-from-the-youngsan-river-estuary-korea-a-comparison-between-freshwater-and-saltwater
#5
Seongjin Hong, Sung-Deuk Choi, Jong Seong Khim
Differences in the distribution, partitioning, and bioaccumulation characteristics of arsenicals between freshwater and saltwater systems remain poorly understood. To determine the characteristics of distribution and behavior of arsenicals, multimedia environmental samples including water, suspended particles, zooplankton, sediments, and porewater were collected from inner (five sites, freshwater) and outer (five sites, saltwater) regions of the estuary dike of the Youngsan River Estuary in South Korea (Nov...
November 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29145867/environmental-variables-associated-with-anopheline-larvae-distribution-and-abundance-in-yanomami-villages-within-unaltered-areas-of-the-brazilian-amazon
#6
Jordi Sánchez-Ribas, Joseli Oliveira-Ferreira, John E Gimnig, Cleomar Pereira-Ribeiro, Maycon Sebastião Alberto Santos-Neves, Teresa Fernandes Silva-do-Nascimento
BACKGROUND: Many indigenous villages in the Amazon basin still suffer from a high malaria burden. Despite this health situation, there are few studies on the bionomics of anopheline larvae in such areas. This publication aims to identify the main larval habitats of the most abundant anopheline species and to assess their associations with some environmental factors. METHODS: We conducted a 19-month longitudinal study from January 2013 to July 2014, sampling anopheline larvae in two indigenous Yanomami communities, comprised of four villages each...
November 16, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29145135/forced-and-long-term-degradation-assays-of-tenoxicam-piroxicam-and-meloxicam-in-river-water-degradation-products-and-adsorption-to-sediment
#7
Juan J Jiménez, Beatriz E Muñoz, María I Sánchez, Rafael Pardo
The fate of the pharmaceutical drugs tenoxicam, piroxicam and meloxicam in river water is evaluated here for first time. So, biological, photochemical and thermal degradation assays have been conducted to estimate their degradation rates and know their degradation products. Results indicated that the direct sunlight irradiation, without any protection, promoted a fast degradation of the oxicams while the chemical reactions in solution were less important. The biological degradation in water was negligible except for tenoxicam in whose case its influence was scarce...
October 25, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145085/analysis-of-microplastics-in-water-by-micro-raman-spectroscopy-release-of-plastic-particles-from-different-packaging-into-mineral-water
#8
Darena Schymanski, Christophe Goldbeck, Hans-Ulrich Humpf, Peter Fürst
Microplastics are anthropogenic contaminants which have been found in oceans, lakes and rivers. Investigations focusing on drinking water are rare and studies have mainly been using micro-Fourier Transform Infrared Spectroscopy (μ-FT-IR). A major limitation of this technique is its inability to detect particles smaller than 20 μm. However, micro-Raman spectroscopy is capable of detecting even smaller particle sizes. Therefore, we show that this technique, which was used in this study, is particularly useful in detecting microplastics in drinking water where particle sizes are in the low micrometer range...
November 6, 2017: Water Research
https://www.readbyqxmd.com/read/29145072/pyridoxamine-driven-selective-turn-off-detection-of-picric-acid-using-glutathione-stabilized-fluorescent-copper-nanoclusters-and-its-applications-with-chemically-modified-cellulose-strips
#9
Ravi Patel, Shilpa Bothra, Rajender Kumar, Guido Crisponi, Suban K Sahoo
The present work reports the interaction of various vitamin B6 cofactors with the red emitting glutathione stabilized copper nanoclusters (GSH-CuNCs). Addition of pyridoxamine (PM) resulted a new turn-on band at 410nm due to the possible adsorption over the surface of GSH-CuNCs. The nano-assembly PM-GSH-CuNCs was applied for the selective detection of nitro-aromatic compounds. Upon addition of picric acid (PA), the fluorescence of PM-GSH-CuNCs was selectively quenched at 410nm and ~ 625nm among the other tested nitro-aromatic compounds...
November 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29145058/occurrence-distribution-and-ecological-risks-of-phthalate-esters-in-the-seawater-and-sediment-of-changjiang-river-estuary-and-its-adjacent-area
#10
Ze-Ming Zhang, Hong-Hai Zhang, Jing Zhang, Qian-Wen Wang, Gui-Peng Yang
A total of 133 seawater samples and 17 sediment samples were collected from 81 sampling sites in the Changjiang River Estuary and its adjacent area and were analyzed for 16 phthalate esters (PAEs). The Σ16 PAE concentrations in the seawater and sediment samples ranged from 180.3ng·L(-1) to 3421ng·L(-1) and from 0.48μg·g(-1) to 29.94μg·g(-1)dry weight (dw), respectively, with mean values of 943.6ng·L(-1) and 12.88μg·g(-1). The distribution of ∑16PAE concentrations in the water column showed that PAE concentrations in the bottom samples were higher than those in the surface samples (except the transect C located inside the Changjiang River Estuary), with the maxima appearing in the bottom layer at the offshore stations...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29145051/towards-stressor-specific-macroinvertebrate-indices-which-traits-and-taxonomic-groups-are-associated-with-vulnerable-and-tolerant-taxa
#11
Elisabeth Berger, Peter Haase, Ralf B Schäfer, Andrea Sundermann
Monitoring of macroinvertebrate communities is frequently used to define the ecological health status of rivers. Ideally, biomonitoring should also give an indication on the major stressors acting on the macroinvertebrate communities supporting the selection of appropriate management measures. However, most indices are affected by more than one stressor. Biological traits (e.g. size, generation time, reproduction) could potentially lead to more stressor-specific indices. However, such an approach has rarely been tested...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29144313/preliminary-results-of-water-quality-assessment-using-phytoplankton-and-physicochemical-approaches-in-the-huai-river-basin-china
#12
Hao Chen, Qi-Ting Zuo, Yong-Yong Zhang
Water pollution has been a significant issue in the Huai River Basin (HRB) of China since the late 1970s. In July and December 2013, two field investigations were carried out at 10 sites along the main streams of the basin. The monitoring indices contained both physicochemical variables and the structure and composition of phytoplankton communities. The correlations between communities and physicochemical variables were analyzed using cluster analysis and redundancy analysis. Moreover, water quality was evaluated using the comprehensive nutrition state index (TLI) and Shannon-Wiener diversity index (H)...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144301/contamination-levels-and-potential-sources-of-organic-pollution-in-an-asian-river
#13
Chitsan Lin, Kim Anh Nguyen, Chi Thanh Vu, Delia Senoro, Maria Ching Villanueva
The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds (SVOCs) for a period of 16 months (Feb 2014-June 2015). Our analyses show that elevated levels of VOCs were observed near two industrial areas, Dashe and Renwu industrial parks...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144294/higher-alkyl-sulfatase-activity-required-by-microbial-inhabitants-to-remove-anionic-surfactants-in-the-contaminated-surface-waters
#14
Bulent Icgen, Salih Batuhan Salik, Lale Goksu, Huseyin Ulusoy, Fadime Yilmaz
Biodegradation of anionic surfactants, like sodium dodecyl sulfate (SDS) are challenged by some bacteria through the function of the enzyme alkyl sulfatases. Therefore, identifying and characterizing bacteria capable of degrading SDS with high alkyl sulfatase enzyme activity are pivotal. In this study, bacteria isolated from surfactant contaminated river water were screened for their potential to degrade SDS. Primary screening carried out by the conventional enrichment culture technique and assessment of SDS-degrading ability through methylene blue active substance assay revealed 12, out of 290, SDS-degrading surface water bacteria with maximum SDS degrading abilities of 46-94% in 24-54 h...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29142268/influence-of-large-reservoir-operation-on-water-levels-and-flows-in-reaches-below-dam-case-study-of-the-three-gorges-reservoir
#15
Yunping Yang, Mingjin Zhang, Lingling Zhu, Wanli Liu, Jianqiao Han, Yanhua Yang
The Three Gorges Project (TGP) is the world's largest water conservation project. The post-construction low-flow water level at the same discharge below the dam has declined, but there remains disagreement over whether the flood level has increased. Measured water levels and upstream and downstream flow data from 1955 to 2016 show that, post-construction: (1) the low-flow water level at the same discharge decreased, and the lowest water level increased due to dry-season reservoir discharge; (2) the decline of the low-flow water level below the dam was less than the undercutting value of the flow channel of the river; (3) the flood level at the same discharge below the dam was slightly elevated, although peak water levels decreased; (4) flood characteristics changed from a high discharge-high flood level to a medium discharge - high flood level; and (5) an expected decline in the flood level downstream was not observed...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141237/influence-of-sewage-treatment-plant-effluent-discharge-into-multipurpose-river-on-its-water-quality-a-quantitative-health-risk-assessment-of-cryptosporidium-and-giardia
#16
Shumin Xiao, Sike Hu, Yan Zhang, Xiaoyun Zhao, Wenwei Pan
Sewage treatment plants (STPs) are one of the sources of pathogens discharged into surface water. An investigation was carried out over the duration of 12 months in Henan Province, China, to evaluate the health influence of municipal wastewater effluent discharge on water quality of the receiving water. A discharge-based quantitative microbial risk assessment (QMRA) was employed, taking into account the vegetables consumption habits of the Chinese, population subgroups with different immune statuses and ages, to evaluate the incremental disease burden from agricultural irrigation and swimming exposure scenarios associated with increased concentration of the protozoan Cryptosporidium and/or Giardia in the receiving river...
November 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29141037/edna-for-detection-of-five-highly-invasive-molluscs-a-case-study-in-urban-rivers-from-the-iberian-peninsula
#17
Laura Clusa, Laura Miralles, Ana Basanta, Carmelo Escot, Eva García-Vázquez
Biological invasions are an important threat to biodiversity especially in aquatic ecosystems, and their frequency is generally higher near urban areas. Potentially invasive non-indigenous molluscs were deliberately introduced into European waters for food (Corbicula fluminea) and biocontrol (Melanoides tuberculata), and unintentionally introduced by ballast water (Mytilopsis leucophaeata, Corbicula fluminea), stock contamination (Sinanodonta woodiana), accidental escapes from aquaculture (Sinanodonta woodiana), aquarium trade releases (Melanoides tuberculata) and even attached to aquatic birds (Corbicula fluminea)...
2017: PloS One
https://www.readbyqxmd.com/read/29140305/probabilistic-prognosis-of-environmental-radioactivity-concentrations-due-to-radioisotopes-discharged-to-water-bodies-from-nuclear-power-plants
#18
Juan Tomás Zerquera, Juan C Mora, Beatriz Robles
Due to their very low values, the complexity of comparing the contribution of nuclear power plants (NPPs) to environmental radioactivity with modeled values is recognized. In order to compare probabilistic prognosis of radioactivity concentrations with environmental measurement values, an exercise was performed using public data of radioactive routine discharges from three representative Spanish nuclear power plants. Specifically, data on liquid discharges from three Spanish NPPs: Almaraz, Vandellós II, and Ascó to three different aquatic bodies (river, lake, and coast) were used...
November 15, 2017: Toxics
https://www.readbyqxmd.com/read/29140076/direct-analysis-of-lignin-phenols-in-freshwater-dissolved-organic-matter
#19
Hendrik Reuter, Julia Gensel, Marcus Elvert, Dominik Zak
A novel approach for the analysis of dissolved lignin in freshwaters is presented. Lignin concentrations in natural waters are low and a lignin extraction is usually required to obtain sufficient sample for analysis. In this method, extraction and dry down of the dissolved lignin are omitted and alkaline CuO oxidation is directly performed using 15 mL water sample in a microwave digestion system, thus reducing the required amount of sample and its preparation time considerably. Low procedural blank values are obtained by solid phase extraction (SPE) of the oxidized lignin phenols on HLB sorbents...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29139609/development-of-a-high-throughput-method-based-on-thin-film-microextraction-using-a-96-well-plate-system-with-a-cork-coating-for-the-extraction-of-emerging-contaminants-in-river-water-samples
#20
Lucas Morés, Adriana Neves Dias, Eduardo Carasek
In this study, a new method was developed in which a biosorbent material is used as the extractor phase in conjunction with a recently described sample preparation technique called thin-film microextraction and a 96-well plate system. The method was applied to the determination of emerging contaminants, such as 3-(4-methylbenzylidene) camphor, ethylparaben, triclocarban and bisphenol A, in water samples. The separation and detection of the analytes were performed by high-performance liquid chromatography with diode array detection...
November 15, 2017: Journal of Separation Science
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