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https://www.readbyqxmd.com/read/28324852/a-novel-water-quality-data-analysis-framework-based-on-time-series-data-mining
#1
Weihui Deng, Guoyin Wang
The rapid development of time-series data mining provides an emerging method for water resource management research. In this paper, based on the time-series data mining methodology, we propose a novel and general analysis framework for water quality time-series data. It consists of two parts: implementation components and common tasks of time-series data mining in water quality data. In the first part, we propose to granulate the time series into several two-dimensional normal clouds and calculate the similarities in the granulated level...
March 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28324839/contributions-of-trace-elements-to-the-sea-by-small-uncontaminated-rivers-effects-of-a-water-reservoir-and-a-wastewater-treatment-plant
#2
Miguel Ángel Álvarez-Vázquez, Ricardo Prego, Miguel Caetano, Elena De Uña-Álvarez, Maryló Doval, Susana Calvo, Carlos Vale
Trace element contributions from small rivers to estuaries is an issue barely addressed in the literature. In this work, freshwater flowing into the Ria of Cedeira (NW Iberian Peninsula) was studied during a hydrological year through the input from three rivers, one considered uncontaminated (the Das-Mestas River), a second affected by urban treated wastewater discharges (the Condomiñas River), and the third containing a water reservoir for urban supply (the Forcadas River). With the objective of assessing the possible influence of human pressure, the annual yields for selected trace elements (Al, Fe, As, Cd, Co, Cr, Cu, Mn, Mo, Ni and Pb) were estimated and compared by normalizing by basin surface...
March 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28324837/status-of-pesticides-pollution-in-tanzania-a-review
#3
REVIEW
Raheli Elibariki, Mihayo Musabila Maguta
Various studies have been conducted in Tanzania to assess the magnitude of pesticides pollution associated with pesticides application, storage, disposal as well as knowledge of farmers on pesticides handling. The studies analysed samples from different matrices covering vegetation, biota, water, sediments and soil. The objective of this review was to summarise the results of pesticides residues reported in different components of the environment to give a clear picture of pesticides pollution status in the country for law enforcement as well as for taking precaution measures...
March 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28324836/pahs-behavior-in-surface-water-and-groundwater-of-the-yellow-river-estuary-evidence-from-isotopes-and-hydrochemistry
#4
Jing Li, Fadong Li, Qiang Liu
Large-scale irrigation projects have impacted the regional surface-groundwater interactions in the North China Plain (NCP). Given this concern, the aim of this study is to evaluate levels of PAH pollution, identify the sources of the PAHs, analyze the influence of surface-groundwater interactions on PAH distribution, and propose urgent management strategies for PAHs in China's agricultural areas. PAH concentrations, hydrochemical indicators and stable isotopic compositions (δ(18)O and δ(2)H) were determined for surface water (SW) and groundwater (GW) samples...
March 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28324277/using-multivariate-techniques-to-assess-the-effects-of-urbanization-on-surface-water-quality-a-case-study-in-the-liangjiang-new-area-china
#5
Kun Luo, Xuebin Hu, Qiang He, Zhengsong Wu, Hao Cheng, Zhenlong Hu, Asit Mazumder
Rapid urbanization in China has been causing dramatic deterioration in the water quality of rivers and threatening aquatic ecosystem health. In this paper, multivariate techniques, such as factor analysis (FA) and cluster analysis (CA), were applied to analyze the water quality datasets for 19 rivers in Liangjiang New Area (LJNA), China, collected in April (dry season) and September (wet season) of 2014 and 2015. In most sampling rivers, total phosphorus, total nitrogen, and fecal coliform exceeded the Class V guideline (GB3838-2002), which could thereby threaten the water quality in Yangtze and Jialing Rivers...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28324156/molecular-characterization-of-two-rhesus-glycoproteins-from-the-euryhaline-freshwater-white-rimmed-stingray-himantura-signifer-and-changes-in-their-transcript-levels-and-protein-abundance-in-the-gills-kidney-and-liver-during-brackish-water-acclimation
#6
Cheng T Yeam, You R Chng, Jasmine L Y Ong, Wai P Wong, Shit F Chew, Yuen K Ip
Himantura signifer is a freshwater stingray which inhabits rivers in Southeast Asia. It is ammonotelic in fresh water, but retains the capacities of urea synthesis and ureosmotic osmoregulation to survive in brackish water. This study aimed to elucidate the roles of Rhesus glycoproteins (Rhgp), which are known to transport ammonia, in conserving nitrogen (N) in H. signifer during brackish water acclimation when N became limited resulting from increased hepatic urea synthesis. The complete coding sequence of rhbg from H...
March 21, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28323451/phytostabilization-of-heavy-metals-by-the-emergent-macrophyte-vossia-cuspidata-roxb-griff-a-phytoremediation-approach
#7
Tarek M Galal, Fatma A Gharib, Safia M Ghazi, Khalid H Mansour
The present study was conducted to investigate the potential of Vossia cuspidata as a phytoremediator to accumulate heavy metals from polluted water bodies. Thirty-two quadrats, distributed equally in eight sites (six polluted sites along Ismailia canal and two unpolluted sites along the Nile River) were selected seasonally for plant, water and sediment investigations. Winter plants recorded the highest values of shoot height, diameter, and leaf width, but the lowest shoot density. Plants collected in autumn had the lowest values of leaf length, width and area, while those in spring had the highest shoot density, with the lowest shoot height...
March 21, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28319887/physico-chemical-and-genotoxicity-analysis-of-guaribas-river-water-in-the-northeast-brazil
#8
João Marcelo de Castro E Sousa, Ana Paula Peron, Felipe Cavalcanti Carneiro da Silva, Ellifran Bezerra de Siqueira Dantas, Ataíde de Macedo Vieira Lima, Victor Alves de Oliveira, Leomá Albuquerque Matos, Márcia Fernanda Correia Jardim Paz, Marcus Vinicius Oliveira Barros de Alencar, Muhammad Torequl Islam, Ana Amélia de Carvalho Melo-Cavalcante, Cláudia Costa Bonecker, Horácio Ferreira Júlio
River pollution in Brazil is significant. This study aimed to evaluate the physico-chemical and genotoxic profiles of the Guaribas river water, located in Northeast Brazil (State of Piauí, Brazil). The study conducted during the dry and wet seasons to understand the frequency of pollution throughout the year. Genotoxicity analysis was done with the blood of Oreochromis niloticus by using the comet assay. Water samples were collected from upstream, within and downstream the city Picos. The results suggest a significant (p < 0...
March 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28319862/multi-phase-distribution-and-comprehensive-ecological-risk-assessment-of-heavy-metal-pollutants-in-a-river-affected-by-acid-mine-drainage
#9
Jianbo Liao, Xuan Ru, Binbin Xie, Wanhui Zhang, Haizhen Wu, Chaofei Wu, Chaohai Wei
To date, there is a lack of a comprehensive research on heavy metals detection and ecological risk assessment in river water, sediments, pore water (PW) and suspended solids (SS). Here, the concentrations of heavy metals, including Cu, Zn, Mn, Cd, Pb and As, and their distribution between the four phases was studied. Samples for analysis were taken from twelve sites of the Hengshi River, Guangdong Province, China, during the rainy and dry seasons. A new comprehensive ecological risk index (CERI) based on considering metal contents, pollution indices, toxicity coefficients and water categories is offered for prediction of potential risk on aquatic organisms...
March 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319861/different-salt-concentrations-induce-alterations-both-in-photosynthetic-parameters-and-salt-gland-activity-in-leaves-of-the-mangrove-avicennia-schaueriana
#10
Janaina Dos Santos Garcia, Ândrea Carla Dalmolin, Marcel Giovanni Costa França, Pedro Antônio Oliveira Mangabeira
Mangrove sites are constantly under tidal regimes, where there is variation of dissolved oxygen and saline content in water. This study evaluated the effects of varying salinity in Avicennia schaueriana, an abundant species in the sea-mangrove-river interface. Seedlings of A. schaueriana were harvested at the riverbank and placed in different saline and nutrient solutions in a greenhouse in order to simulate a saline flow. After 7 acclimatization days, plants were exposed to the following saline concentrations: 0, 50, 170 and 250mM NaCl, for a period of 30 days...
March 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319719/year-round-phytofiltration-lagoon-assessment-using-pistia-stratiotes-within-a-pilot-plant-scale-biorefinery
#11
Eugenia J Olguín, Daniel A García-López, Ricardo E González-Portela, Gloria Sánchez-Galván
Phytofiltration lagoons are phytoremediation technologies suitable for tropical and sub-tropical regions requiring cost-effective and echo-friendly technologies. A biorefinery of fourth generation has been implemented at pilot plant level in Xalapa, Mexico, and the phytofiltration lagoon, being the first module for provision of treated water and plant biomass for biofuel production plays a key role. The aim of this work was to evaluate the performance of such phytofiltration lagoon with a working volume of 13,000 L for the removal of nutrients from an urban river polluted with domestic wastewater and the biomass productivity of the macrophyte Pistia stratiotes, during five different experimental periods, comprising 42 days each one...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319703/impacts-of-human-activities-on-nutrient-transport-in-the-yellow-river-the-role-of-the-water-sediment-regulation-scheme
#12
Xinyu Li, Hontao Chen, Xueyan Jiang, Zhigang Yu, Qingzhen Yao
Anthropogenic activities alter the natural states of large rivers and their surrounding environment. The Yellow River is a well-studied case of a large river with heavy human control. An artificial managed water and sediment release system, known as the Water-Sediment Regulation Scheme (WSRS), has been carried out annually in the Yellow River since 2002. Nutrient concentrations and composition display significant time and space variations during the WSRS period. To figure out the anthropogenic impact of nutrient changes and transport in the Yellow River, biogeochemical observations were carried out in both middle reaches and lower reaches of the Yellow River during 2014 WSRS period...
March 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28318787/municipal-wastewater-treatment-plant-effluent-induced-effects-on-freshwater-mussel-populations-and-the-role-of-mussel-refugia-in-recolonizing-an-extirpated-reach
#13
Patricia L Gillis, Rodney McInnis, Joseph Salerno, Shane R de Solla, Mark R Servos, Erin M Leonard
Global human population and urbanization continually increase the volume of wastewater entering aquatic environments. Despite efforts to treat these effluents, they contribute a diverse suite of substances that enter watersheds at concentrations that have the potential to elicit adverse effects on aquatic organisms. The relationship between wastewater treatment plant (WWTP) effluent exposure and biological responses within aquatic ecosystems remains poorly understood, especially at the population level. To examine the effect of WWTP effluents on sentinel invertebrates, freshwater mussels were assessed in the Grand River, Ontario, in populations associated with the outfall of a major WWTP...
March 15, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28318786/modulation-of-the-stress-response-in-wild-fish-is-associated-with-variation-in-dissolved-nitrate-and-nitrite
#14
Tom G Pottinger
Disruption of non-reproductive endocrine systems in wildlife by chemicals has received little attention but represents a potentially significant problem. Nitrate is a major anthropogenic contaminant in the freshwater aquatic environment and has been identified as a potential disrupter of endocrine function in aquatic animals. This study was conducted to investigate the relationship between the function of the neuroendocrine stress axis in fish and inorganic N loading along reaches of rivers receiving cumulative point source and diffuse chemical inputs...
March 15, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28318696/coupling-lidar-and-thermal-imagery-to-model-the-effects-of-riparian-vegetation-shade-and-groundwater-inputs-on-summer-river-temperature
#15
Vincent Wawrzyniak, Pascal Allemand, Sarah Bailly, Jérôme Lejot, Hervé Piégay
In the context of global warming, it is important to understand the drivers controlling river temperature in order to mitigate temperature increases. A modeling approach can be useful for quantifying the respective importance of the different drivers, notably groundwater inputs and riparian shading which are potentially critical for reducing summer temperature. In this study, we use a one-dimensional deterministic model to predict summer water temperature at an hourly time step over a 21km reach of the lower Ain River (France)...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28318692/characterization-and-source-identification-of-nitrogen-in-a-riverine-system-of-monsoon-climate-region-china
#16
Jie Yuan, Siyue Li, Xi Han, Qiuyang Chen, Xiaoli Cheng, Quanfa Zhang
There are increasing concerns in nitrogen (N) pollution worldwide, especially in aquatic ecosystems, and thus quantifying its sources in waterways is critical for pollution prevention and control. In this study, we investigated the spatio-temporal variabilities of inorganic N concentration (i.e., NO3(-), NH4(+)) and total dissolved N (TDN) and identified their sources in waters and suspended matters using an isotopical approach in the Jinshui River, a river with a length of 87km in the monsoon-climate region of China...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28318568/multiresidue-analysis-of-24-water-framework-directive-priority-substances-by-on-line-solid-phase-extraction-liquid-chromatography-tandem-mass-spectrometry-in-environmental-waters
#17
Adrià Rubirola, Mª Rosa Boleda, Mª Teresa Galceran
This paper reports the development of a fully multiresidue and automated on-line solid phase extraction (SPE) - liquid chromatography tandem mass spectrometry (LC-MS/MS) method for the determination of 24 priority substances (PS) belonging to different classes (pesticides, hormones or pharmaceuticals) included in the Directive 2013/39/UE and the recent Watch List (Decision 2015/495) in water samples (drinking water, surface water, and effluent wastewaters). LC-MS/MS conditions and on-line SPE parameters such as sorbent type, sample and wash volumes were optimized...
March 6, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28318115/microbial-players-and-processes-involved-in-phytoplankton-bloom-utilization-in-the-water-column-of-a-fast-flowing-river-dominated-estuary
#18
Maria W Smith, Lydie Herfort, Caroline S Fortunato, Byron C Crump, Holly M Simon
Fueled by seasonal phytoplankton blooms, the Columbia River estuary is a natural bioreactor for organic matter transformations. Prior metagenome analyses indicated high abundances of diverse Bacteroidetes taxa in estuarine samples containing phytoplankton. To examine the hypothesis that Bacteroidetes taxa have important roles in phytoplankton turnover, we further analyzed metagenomes from water collected along a salinity gradient at 0, 5, 15, 25, and 33 PSU during bloom events. Size fractions were obtained by using a 3-μm prefilter and 0...
March 20, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28317258/centrifugeless-ultrasound-assisted-emulsification-microextraction-based-on-salting-out-phenomenon-followed-by-high-performance-liquid-chromatography-for-the-simple-determination-of-phthalate-esters-in-aqueous-samples
#19
Ehsan Mirparizi, Maryam Rajabi, Mohammad Bazregar, Alireza Asghari
A fast, sensitive, and centrifugeless ultrasound-assisted emulsification microextraction followed by high performance liquid chromatography method is developed for the determination of some phthalate esters in aqueous samples. In this method, a simple approach is followed for elimination of the centrifugation step in dispersive liquid-liquid microextraction using an organic solvent whose melting point is near the ambient temperature, consumption of the extracting solvent is efficiently reduced, and the overall extraction time was found to be only 7 min...
March 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28316899/water-quality-assessment-in-the-german-river-of-the-years-2014-2015-how-a-case-study-on-the-impact-of-a-storm-water-sedimentation-basin-displayed-impairment-of-fish-health-in-the-argen-river-southern-germany
#20
Paul Thellmann, Bertram Kuch, Karl Wurm, Heinz-R Köhler, Rita Triebskorn
BACKGROUND: The present work investigates the impact of discharges from a storm water sedimentation basin (SSB) receiving runoff from a connected motorway in southern Germany. The study lasted for almost two years and was aimed at assessing the impact of the SSB on the fauna of the Argen River, which is a tributary of Lake Constance. Two sampling sites were examined up- and downstream of the SSB effluent. A combination of different diagnostic methods (fish embryo test with the zebrafish, histopathology, micronucleus test) was applied to investigate health impairment and genotoxic effects in indigenous fish as well as embryotoxic potentials in surface water and sediment samples of the Argen River, respectively, in samples of the SSB effluent...
2017: Environmental Sciences Europe
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