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https://www.readbyqxmd.com/read/29333682/selective-extraction-of-bisphenol-a-from-water-by-one-monomer-molecularly-imprinted-magnetic-nanoparticles
#1
Zhenkun Lin, Yanfang Zhang, Yu Su, Jinxia Qi, Yinhang Jia, Changjiang Huang, Qiaoxiang Dong
One-monomer molecularly imprinted magnetic nanoparticles were prepared as adsorbents for selective extraction of bisphenol A from water in this study. A single bi-functional monomer was adopted for preparation of the molecularly imprinted polymer, avoiding the tedious trial-and-error optimizations as traditional strategy. Moreover, bisphenol F was used as the dummy template for bisphenol A to avoid the interference from residual template molecules. These nanoparticles not only showed large adsorption capacity and good selectivity to the bisphenol A, but also outstanding magnetic response performance...
January 15, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29333569/an-integrated-fuzzy-based-advanced-eutrophication-simulation-model-to-develop-the-best-management-scenarios-for-a-river-basin
#2
Rallapalli Srinivas, Ajit Pratap Singh
Assessment of water quality status of a river with respect to its discharge has become prerequisite to sustainable river basin management. The present paper develops an integrated model for simulating and evaluating strategies for water quality management in a river basin management by controlling point source pollutant loadings and operations of multi-purpose projects. Water Quality Analysis and Simulation Program (WASP version 8.0) has been used for modeling the transport of pollutant loadings and their impact on water quality in the river...
January 14, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29333347/beyond-harm-s-reach-submersion-of-river-turtle-nesting-areas-and-implications-for-restoration-actions-after-amazon-hydropower-development
#3
Darren Norris, Fernanda Michalski, James P Gibbs
The global expansion of energy demands combined with abundant rainfall, large water volumes and high flow in tropical rivers have led to an unprecedented expansion of dam constructions in the Amazon. This expansion generates an urgent need for refined approaches to river management; specifically a move away from decision-making governed by overly generalized guidelines. For the first time we quantify direct impacts of hydropower reservoir establishment on an Amazon fresh water turtle. We conducted surveys along 150 km of rivers upstream of a new dam construction during the low water months that correspond to the nesting season of Podocnemis unifilis in the study area...
2018: PeerJ
https://www.readbyqxmd.com/read/29332839/magnetic-solid-phase-extraction-based-on-magnetic-multiwalled-carbon-nanotubes-for-the-simultaneous-enantiomeric-analysis-of-five-%C3%AE-blockers-in-the-environmental-samples-by-chiral-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#4
Zhaokun Wang, Xue Zhang, Shenmeng Jiang, Xingjie Guo
In this work, the magnetic multiwalled carbon nanotubes (Mag-MWCNTs) were prepared by self-assembly method and characterized by scanning electron microscopy, X-ray powder diffraction, energy dispersive X-ray and vibrating sample magnetometer. Then, these synthetic Mag-MWCNTs were used as sorbents to extract five β-blockers (atenolol, metoprolol, esmolol, pindolol and arotinolol) by magnetic solid-phase extraction. The target analytes adsorbed on Mag-MWCNTs were eluted and determined on a chiral α-acid glycoprotein column coupled with a triple quadrupole mass spectrometry...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332814/novel-s-n-doped-carbon-quantum-dot-based-off-on-fluorescent-sensor-for-silver-ion-and-cysteine
#5
Sen Liao, Xinyi Zhao, Fawei Zhu, Miao Chen, Zhiliang Wu, Xiangzhi Song, Hua Yang, Xiaoqing Chen
In this work, sulfur and nitrogen co-doped carbon dots (S,N-CQDs) as highly selective fluorescent probe for silver ion (Ag+) and cysteine (Cys) detection were designed and synthesized directly from citric acid and thiamine hydrochloride via a one-step hydrothermal protocol in 63.8% quantum yield. This probe enabled selective detection of Ag+ with a linear range of 0-10 and 10-250μM and a limit of detection of 0.40μM with respect to the variation in fluorescence induced by target concentration and electron-transfer from S,N-CQDs to Ag+...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332279/ecotoxicity-thresholds-for-ametryn-diuron-hexazinone-and-simazine-in-fresh-and-marine-waters
#6
Michael St J Warne, Olivia King, Rachael A Smith
Triazine and urea herbicides are two groups of photosystem II inhibiting herbicides frequently detected in surface, ground and marine waters. Yet, there are few water quality guidelines for herbicides. Ecotoxicity thresholds (ETs) for ametryn, hexazinone and simazine (triazine herbicides) and diuron (a urea herbicide) were calculated using the Australian and New Zealand method for deriving guideline values to protect fresh and marine ecosystems. Four ETs were derived for each chemical and ecosystem that should theoretically protect 99, 95, 90 and 80% of species (i...
January 14, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29332148/occurrence-of-pharmaceuticals-and-personal-care-products-and-their-associated-environmental-risks-in-a-large-shallow-lake-in-north-china
#7
Panwei Zhang, Huaidong Zhou, Kun Li, Xiaohui Zhao, Qiaona Liu, Dongjiao Li, Gaofeng Zhao
Eighteen selected pharmaceuticals and personal care products (PPCPs), consisting of five non-antibiotic pharmaceuticals (N-APs), four sulfonamides (SAs), four tetracyclines (TCs), four macrolides (MCs), and one quinolone (QN) were detected in water, pore water, and sediment samples from Baiyangdian Lake, China. A total of 31 water samples and 29 sediment samples were collected in March 2017. Caffeine was detected with 100% frequency in surface water, pore water, and sediment samples. Carbamazepine was detected with 100% frequency in surface water and sediment samples...
January 13, 2018: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/29332146/mercury-concentrations-in-northern-two-lined-salamanders-from-stream-ecosystems-in-garrett-county-maryland
#8
Mark S Castro, Robert H Hilderbrand, Morgan Kaumeyer
The purpose of this study was to increase our understanding of the bioaccumulation of mercury in northern two-lined salamanders (Eurycea bislineata bislineata) in freshwater stream ecosystems. We collected 111 adults and 131 larval northern two-lined salamanders from six streams in Garrett County, Maryland. These salamanders were collected in April, July, and September 2010. We measured the size and tissue mercury content in all of these salamanders. We also measured the total and methyl mercury concentrations in stream water on monthly basis from April through December 2010...
January 13, 2018: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29331917/comparision-of-photocatalysis-and-photolysis-processes-for-arsenic-oxidation-in-water
#9
Klaiani B Fontana, Giane G Lenzi, Eriton C R Seára, Eduardo S Chaves
The oxidation of As(III) to As(V) in aqueous solution was evaluated using heterogeneous photocatalysis and photolysis. The influence of TiO2 as catalyst in different crystalline (rutile, anatase) and commercial forms was evaluated in a batch reactor and an insignificant difference was observed between them. The process by photocatalysis reached up to 97% As(III) oxidation and no significant difference was observed comparing to results obtained by photolysis. The photolysis experiments (UV radiation only), also carried out in a batch system, showed a high oxidation rate of As(III) (90% in 20min)...
January 11, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29330969/is-salinity-an-obstacle-for-biological-invasions
#10
Filipa Paiva, Andrea Barco, Yiyong Chen, Alireza Mirzajani, Farrah T Chan, Velda Lauringson, Miguel Baltazar-Soares, Aibin Zhan, Sarah A Bailey, Jamileh Javidpour, Elizabeta Briski
Invasions of freshwater habitats by marine and brackish species have become more frequent in recent years with many of those species originating from the Ponto-Caspian region. Populations of Ponto-Caspian species have successfully established in the North and Baltic Seas and their adjoining rivers, as well as in the Great Lakes-St. Lawrence River region. To determine if Ponto-Caspian taxa more readily acclimatize to and colonize diverse salinity habitats than taxa from other regions, we conducted laboratory experiments on 22 populations of eight gammarid species native to the Ponto-Caspian, Northern European and Great Lakes-St...
January 13, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29330820/effect-of-ion-exchange-on-the-rate-of-aerobic-microbial-oxidation-of-ammonium-in-hyporheic-zone-sediments
#11
Ailan Yan, Chongxuan Liu, Yuanyuan Liu, Fen Xu
Microbially mediated ammonium oxidation is a major process affecting nitrogen transformation and cycling in natural environments. This study investigated whether ion exchange process can affect microbially mediated aerobic oxidation of ammonium in a hyporheic zone (HZ) sediments from the Columbia River at US Department of Energy's Hanford site, Washington State. Experiments were conducted using synthetic groundwater and river water to investigate their effect on ammonium oxidation. Results indicated that ammonium sorption through ion exchange reactions decreased the rate of ammonium oxidation, apparently resulting from the influence of the ion exchange on dissolved ammonium concentration, thus decreasing the bioavailability of ammonium for microbial oxidation...
January 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29330608/environmental-performance-information-use-by-conservation-agency-staff
#12
Chloe Bradley Wardropper
Performance-based conservation has long been recognized as crucial to improving program effectiveness, particularly when environmental conditions are dynamic. Yet few studies have investigated the use of environmental performance information by staff of conservation organizations. This article identifies attitudinal, policy and organizational factors influencing the use of a type of performance information-water quality information-by Soil and Water Conservation District staff in the Upper Mississippi River Basin region...
January 12, 2018: Environmental Management
https://www.readbyqxmd.com/read/29330607/river-continuity-restoration-and-diadromous-fishes-much-more-than-an-ecological-issue
#13
H Drouineau, C Carter, M Rambonilaza, G Beaufaron, G Bouleau, A Gassiat, P Lambert, S le Floch, S Tétard, E de Oliveira
Ecosystem fragmentation is a serious threat to biodiversity and one of the main challenges in ecosystem restoration. River continuity restoration (RCR) has often targeted diadromous fishes, a group of species supporting strong cultural and economic values and especially sensitive to river fragmentation. Yet it has frequently produced mixed results and diadromous fishes remain at very low levels of abundance. Against this background, this paper presents the main challenges for defining, evaluating and achieving effective RCR...
January 12, 2018: Environmental Management
https://www.readbyqxmd.com/read/29329710/hydride-generation-coupled-with-thioglycolic-acid-coated-gold-nanoparticles-as-simple-and-sensitive-headspace-colorimetric-assay-for-visual-detection-of-sb-iii
#14
Tesfaye Tolessa, Zhi-Qiang Tan, Jing-Fu Liu
Antimony (Sb) is a toxic element which causes different health problems including cardiac problems and lung cancer in humans, and its levels in surface water can be noticeably increased to 100 μg/L typically in the proximity of anthropogenic sources. Thus, besides instrumental techniques, it is of great significance to develop a simple, sensitive and selective analytical method for direct analysis of Sb(III) at trace level without the need of any expensive and/or complicated instrumentations and sample preparation processes...
April 3, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29329314/influence-of-monsoonal-winds-on-chlorophyll-%C3%AE-distribution-in-the-beibu-gulf
#15
Chunyan Shen, Yunrong Yan, Hui Zhao, Jiayi Pan, Adam T Devlin
The influence of seasonal, monsoonal winds on the temporal and spatial variability of chlorophyll-a (chl-a) in the Beibu Gulf is studied based on long-term satellite data of sea surface winds, chl-a concentration and sea surface temperature (SST) and in-situ observations for the years from 2002 to 2014. The analysis results indicated that under northeasterly monsoonal winds, chl-a concentrations were substantially elevated in most area of the Beibu Gulf, with a high chl-a concentration (>2 mg m-3) patch extending southwestward from the coastal water of the northeastern Gulf, consistent with the winter wind pattern...
2018: PloS One
https://www.readbyqxmd.com/read/29328337/development-and-validation-of-a-simulation-method-pechrem-for-evaluating-spatio-temporal-concentration-changes-of-paddy-herbicides-in-rivers
#16
Yoshitaka Imaizumi, Noriyuki Suzuki, Fujio Shiraishi, Daisuke Nakajima, Shigeko Serizawa, Takeo Sakurai, Hiroaki Shiraishi
In pesticide risk management in Japan, predicted environmental concentrations are estimated by a tiered approach, and the Ministry of the Environment also performs field surveys to confirm the maximum concentrations of pesticides with risk concerns. To contribute to more efficient and effective field surveys, we developed the Pesticide Chemicals High Resolution Estimation Method (PeCHREM) for estimating spatially and temporally variable emissions of various paddy herbicides from paddy fields to the environment...
January 12, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29327304/the-irrigation-effect-how-river-regulation-can-promote-some-riparian-vegetation
#17
Karen M Gill, Lori A Goater, Jeffrey H Braatne, Stewart B Rood
River regulation impacts riparian ecosystems by altering the hydrogeomorphic conditions that support streamside vegetation. Obligate riparian plants are often negatively impacted since they are ecological specialists with particular instream flow requirements. Conversely, facultative riparian plants are generalists and may be less vulnerable to river regulation, and could benefit from augmented flows that reduce drought stress during hot and dry periods. To consider this 'irrigation effect' we studied the facultative shrub, netleaf hackberry (Celtis reticulata), the predominant riparian plant along the Hells Canyon corridor of the Snake River, Idaho, USA, where dams produce hydropeaking, diurnal flow variation...
January 11, 2018: Environmental Management
https://www.readbyqxmd.com/read/29327209/bio-monitoring-of-tissue-accumulation-and-genotoxic-effect-of-heavy-metals-in-cyprinus-carpio-from-river-kabul-khyber-pakhtunkhwa-pakistan
#18
Muhammad Siraj, Muhammad Khisroon, Ajmal Khan, Farrah Zaidi, Ahmad Ullah, Ghani Rahman
The study explored (I) the concentration of heavy metals in water samples (II) their bioaccumulation in common carp Cyprinus carpio (III) and the subsequent genotoxicity in the selected organs of carp; from river Kabul, Khyber Pakhtunkhwa Pakistan. Except for Mercury (Hg) the water samples had all the heavy metals within permissible limits of recommended dietary allowance (RDA). Nonetheless a number of heavy metals (Zn, Ni, Cr, Cd, Pb and Hg) showed bioaccumulation at levels higher than permissible. Zinc (Zn) was the most while Cadmium (Cd) was the least accumulated metal in all tissue samples analyzed...
January 11, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29327191/iron-impregnated-zeolite-catalyst-for-efficient-removal-of-micropollutants-at-very-low-concentration-from-meurthe-river
#19
Hawraa Ayoub, Thibault Roques-Carmes, Olivier Potier, Bachar Koubaissy, Steve Pontvianne, Audrey Lenouvel, Cédric Guignard, Emmanuel Mousset, Hélène Poirot, Joumana Toufaily, Tayssir Hamieh
In this paper, for the first time, faujasite Y zeolite impregnated with iron (III) was employed as a catalyst to remove a real cocktail of micropollutants inside real water samples from the Meurthe river by the means of the heterogeneous photo-Fenton process. The catalyst was prepared by the wet impregnation method using iron (III) nitrate nonahydrate as iron precursor. First, an optimization of the process parameters was conducted using phenol as model macro-pollutant. The hydrogen peroxide concentration, the light wavelength (UV and visible) and intensity, the iron loading immobilized, as well as the pH of the solution were investigated...
January 11, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29327177/influence-of-sampling-frequency-and-load-calculation-methods-on-quantification-of-annual-river-nutrient-and-suspended-solids-loads
#20
Ahmed Elwan, Ranvir Singh, Maree Patterson, Jon Roygard, Dave Horne, Brent Clothier, Geoffrey Jones
Better management of water quality in streams, rivers and lakes requires precise and accurate estimates of different contaminant loads. We assessed four sampling frequencies (2 days, weekly, fortnightly and monthly) and five load calculation methods (global mean (GM), rating curve (RC), ratio estimator (RE), flow-stratified (FS) and flow-weighted (FW)) to quantify loads of nitrate-nitrogen (NO3--N), soluble inorganic nitrogen (SIN), total nitrogen (TN), dissolved reactive phosphorus (DRP), total phosphorus (TP) and total suspended solids (TSS), in the Manawatu River, New Zealand...
January 11, 2018: Environmental Monitoring and Assessment
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