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https://www.readbyqxmd.com/read/28635631/ag-nanoparticles-drop-casting-modification-of-screen-printed-electrodes-for-the-simultaneous-voltammetric-determination-of-cu-ii-and-pb-ii
#1
Clara Pérez-Ràfols, Julio Bastos-Arrieta, Núria Serrano, José Manuel Díaz-Cruz, Cristina Ariño, Joan de Pablo, Miquel Esteban
A new silver nanoparticle modified screen-printed electrode was developed and applied to the simultaneous determination of Pb(II) and Cu(II). Two different types of silver nanoparticles with different shapes and sizes, Ag nanoseeds and Ag nanoprisms, were microscopically characterized and three different carbon substrates, graphite, graphene and carbon nanofibers, were tested. The best analytical performance was achieved for the combination of Ag nanoseeds with a carbon nanofiber modified screen-printed electrode...
June 21, 2017: Sensors
https://www.readbyqxmd.com/read/28635416/arsenic-and-fluoride-co-contamination-in-shallow-aquifers-from-agricultural-suburbs-and-an-industrial-area-of-punjab-pakistan-spatial-trends-sources-and-human-health-implications
#2
Abida Farooqi, Jawairia Sultana, Noshin Masood
Release of arsenic (As) and fluoride (F(-)) species into groundwater is a serious health concern around the world. The present study was the first systematic baseline study conducted in Rahim Yar Khan district, Punjab, focusing on As and F(-) contamination in groundwater. A total of 51 representative groundwater samples comprising of 44 samples from agricultural suburbs and 7 from an industrial base were analysed. Statistical parameters, principal component analysis-multiple linear regression (PCA-MLR) and health risk assessment model were used to investigate the hydro geochemistry, spatial patterns, interrelation, source contribution and associated health risks of high As and F(-) in groundwater of the study area...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28634399/terrestrial-water-load-and-groundwater-fluctuation-in-the-bengal-basin
#3
W G Burgess, M Shamsudduha, R G Taylor, A Zahid, K M Ahmed, A Mukherjee, D J Lapworth, V F Bense
Groundwater-level fluctuations represent hydraulic responses to changes in groundwater storage due to aquifer recharge and drainage as well as to changes in stress that include water mass loading and unloading above the aquifer surface. The latter 'poroelastic' response of confined aquifers is a well-established phenomenon which has been demonstrated in diverse hydrogeological environments but is frequently ignored in assessments of groundwater resources. Here we present high-frequency groundwater measurements over a twelve-month period from the tropical, fluvio-deltaic Bengal Aquifer System (BAS), the largest aquifer in south Asia...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28632908/prediction-of-groundwater-quality-trends-resulting-from-anthropogenic-changes-in-southeast-florida
#4
Quanghee Yi, Mark Stewart
The effects of surface water flow system changes caused by constructing water-conservation areas and canals in southeast Florida on groundwater quality under the Atlantic Coastal Ridge was investigated with numerical modeling. Water quality data were used to delineate a zone of groundwater with low total dissolved solids (TDS) within the Biscayne aquifer under the ridge. The delineated zone has the following characteristics. Its location generally coincides with an area where the Biscayne aquifer has high transmissivities, corresponds to a high recharge area of the ridge, and underlies a part of the groundwater mound formed under the ridge prior to completion of the canals...
June 20, 2017: Ground Water
https://www.readbyqxmd.com/read/28628973/a-baseline-survey-of-dissolved-methane-in-aquifers-of-great-britain
#5
R A Bell, W G Darling, R S Ward, L Basava-Reddi, L Halwa, K Manamsa, B E Ó Dochartaigh
Interest in dissolved methane (CH4) concentrations in aquifers in England, Scotland and Wales ('Great Britain' or GB) has grown concurrently with interest in the exploitation of unconventional gas sources (UGS). Experience, mainly from North America, has shown the importance of a pre-production baseline against which changes possibly due to UGS extraction can be compared. The British Geological Survey, aided by water utilities, private users and regulators, has compiled a unique dataset for CH4 in groundwaters of GB...
June 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28628877/remediation-of-groundwater-contaminated-with-arsenic-through-enhanced-natural-attenuation-batch-and-column-studies
#6
Saeedreza Hafeznezami, Amity G Zimmer-Faust, Dukwoo Jun, Megyn B Rugh, Heather L Haro, Austin Park, Jae Suh, Tina Najm, Matthew D Reynolds, James A Davis, Tarannom Parhizkar, Jennifer A Jay
Batch and column laboratory experiments were conducted on natural sediment and groundwater samples from a contaminated site in Maine, USA with the aim of lowering the dissolved arsenate [As(V)] concentrations through chemical enhancement of natural attenuation capacity. In batch factorial experiments, two levels of treatment for three parameters (pH, Ca, and Fe) were studied at different levels of phosphate to evaluate their impact on As(V) solubility. Results illustrated that lowering pH, adding Ca, and adding Fe significantly increased the sorption capacity of sediments...
June 12, 2017: Water Research
https://www.readbyqxmd.com/read/28628876/column-study-of-enhanced-cr-vi-removal-and-longevity-by-coupled-abiotic-and-biotic-processes-using-fe-0-and-mixed-anaerobic-culture
#7
Jiawei Zhong, Weizhao Yin, Yongtao Li, Ping Li, Jinhua Wu, Gangbiao Jiang, Jingjing Gu, Hao Liang
In this study, Fe(0) and mixed anaerobic culture were integrated in one column to investigate the coupled abiotic and biotic effects on hexa-valent chromium (Cr(VI)) removal and column longevity with an abiotic Fe(0) column in the control experiments. According to the breakthrough study, a slower Cr(VI) breakthrough rate of 0.19 cm/PV was observed in the biotic Fe(0) column whereas the value in the abiotic Fe(0) column was 0.30 cm/PV, resulting in 64% longer life-span and 62% higher Cr(VI) removal capacity in the biotic Fe(0) column than the abiotic one...
June 2, 2017: Water Research
https://www.readbyqxmd.com/read/28628820/river-flow-is-critical-for-vegetation-dynamics-lessons-from-multi-scale-analysis-in-a-hyper-arid-endorheic-basin
#8
Qin Shen, Guangyao Gao, Yihe Lü, Shuai Wang, Xiaohui Jiang, Bojie Fu
Knowledge of the spatio-temporal responses of vegetation dynamics to hydro-climatic factors is important to assess ecological restoration efforts in arid and semiarid areas. In this study, the vegetation dynamics during 2000-2015 were investigated in the downstream area of the Heihe River Basin (HRB) in Northwest China where an ecological water diversion project (EWDP) commenced in 2000. The spatio-temporal relationships between vegetation cover and climatic factors (precipitation and temperature) and available water resources (river flow and groundwater) were determined...
June 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28626252/amelioration-of-arsenic-induced-toxic-effects-in-mice-by-dietary-supplementation-of-syzygium-cumini-leaf-extract
#9
Milan Barai, Nazmul Ahsan, Nilanjana Paul, Khaled Hossain, Mohammad Abdur Rashid, Masashi Kato, Nobutaka Ohgami, Anwarul Azim Akhand
Arsenic created a serious public health problem in Bangladesh due to its presence in groundwater and dissemination of the toxic effects to millions of people. The scarcity of the treatment options to manage this affected population has made the situation much worse. To find a promising treatment option, this study was undertaken to examine the ameliorating roles of Syzygium cumini leaf extract (SLE) against arsenic-induced toxic effects in mice. Swiss albino mice were divided into four groups where 'control' group received pure water + normal feed, 'arsenic (As)' group received sodium arsenite (NaAsO2)-containing water (10 μg/g body weight/day) + normal feed, 'As+SLE' group received NaAsO2-containing water + feed supplemented with SLE (50 µg/g body weight/day) and finally the 'SLE' group received pure water + feed supplemented with SLE...
February 2017: Nagoya Journal of Medical Science
https://www.readbyqxmd.com/read/28625566/advances-in-bioremediation-of-1-4-dioxane-contaminated-waters
#10
Shu Zhang, Phillip B Gedalanga, Shaily Mahendra
1,4-Dioxane is a contaminant of emerging concern that has been found widespread in groundwater, surface water, and drinking water environments. Many states are implementing lower regulatory advisory levels based on the toxicological profile of 1,4-dioxane and the potential public health risks. However, the unique chemical properties of 1,4-dioxane, such as high water solubility, low Henry's law constant, and importantly, the co-occurrence with chlorinated solvents and other contaminants, increase the challenges to efficiently cleanup 1,4-dioxane...
June 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28624130/assessing-the-hydrogeochemical-processes-affecting-groundwater-pollution-in-arid-areas-using-an-integration-of-geochemical-equilibrium-and-multivariate-statistical-techniques
#11
Mohamed El Alfy, Aref Lashin, Fathy Abdalla, Abdulaziz Al-Bassam
Rapid economic expansion poses serious problems for groundwater resources in arid areas, which typically have high rates of groundwater depletion. In this study, integration of hydrochemical investigations involving chemical and statistical analyses are conducted to assess the factors controlling hydrochemistry and potential pollution in an arid region. Fifty-four groundwater samples were collected from the Dhurma aquifer in Saudi Arabia, and twenty-one physicochemical variables were examined for each sample...
June 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28623795/transport-of-road-salt-contamination-in-karst-aquifers-and-soils-over-multiple-timescales
#12
Heather K Robinson, Elizabeth A Hasenmueller
Road deicing has caused widespread environmental Na(+) and Cl(-) release for decades, yet the transport and retention of these contaminants in karst aquifers and soils are poorly understood. We examined the transport dynamics of Na(+) and Cl(-) from road salt in shallow groundwater during flooding and over seasonal timescales by intensively monitoring an urban and a rural karst spring over approximately 2 years. Furthermore, we used a 20-year dataset for the rural spring to determine how salt retention affected long-term geochemical trends in the shallow groundwater...
June 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28623505/assessment-of-arsenic-content-in-soil-rice-grains-and-groundwater-and-associated-health-risks-in-human-population-from-ropar-wetland-india-and-its-vicinity
#13
Sakshi Sharma, Inderpreet Kaur, Avinash Kaur Nagpal
In the present study, potential health risks posed to human population from Ropar wetland and its vicinity, by consumption of inorganic arsenic (i-As) via arsenic contaminated rice grains and groundwater, were assessed. Total arsenic (t-As) in soil and rice grains were found in the range of 0.06-0.11 mg/kg and 0.03-0.33 mg/kg, respectively, on dry weight basis. Total arsenic in groundwater was in the range of 2.31-15.91 μg/L. i-As was calculated from t-As using relevant conversion factors. Rice plants were found to be arsenic accumulators as bioconcentration factor (BCF) was observed to be >1 in 75% of rice grain samples...
June 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28620852/the-generation-of-biogenic-manganese-oxides-and-its-application-in-the-removal-of-as-iii-in-groundwater
#14
Guannan Liang, Yu Yang, Simiao Wu, Yonghai Jiang, Yunfeng Xu
The generation of biogenic manganese oxides (BMnOx) by Microbacterium sp. CSA40, and As(III) removal efficiency and mechanism by BMnOx were investigated in this study. The propagation and growth of Microbacterium sp. CSA40 was conducted in half-strength Luria Broth with 10 mg/L Mn(II), then high concentration of Microbacterium sp. CSA40 was added to PYG medium making its OD600 = 0.9 ± 0.05 for BMnOx generation. The initial Mn(II) concentrations, excessively oligotrophic condition, and pH had great influence on generation of BMnOx by Microbacterium sp...
June 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28620850/the-colloid-hematite-particle-migration-through-the-unsaturated-porous-bed-at-the-presence-of-biosurfactants
#15
Agnieszka Pawlowska, Izabela Sznajder, Zygmunt Sadowski
Colloidal particles have an ability to sorb heavy metals, metalloids, and organic compounds (e.g. biosurfactants) present in soil and groundwater. The pH and ionic strength changes may promote release of such particles causing potential contaminant transport. Therefore, it is very important to know how a colloid particle-mineral particle and colloid-mineral-biosurfactant system behaves in the natural environment. They can have negative impact on the environment and human health. This study highlighted the influence of biosurfactants produced by Pseudomonas aeruginosa on the transport of colloidal hematite (α-Fe2O3) through porous bed (materials collected from the Szklary and Zloty Stok solid waste heaps from Lower Silesia, Poland)...
June 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28619599/impact-of-sulfuric-and-nitric-acids-on-carbonate-dissolution-and-the-associated-deficit-of-co2-uptake-in-the-upper-middle-reaches-of-the-wujiang-river-china
#16
Qi-Bo Huang, Xiao-Qun Qin, Peng-Yu Liu, Lian-Kai Zhang, Chun-Tian Su
Carbonate weathering and the CO2 consumption in karstic area are extensive affected by anthropogenic activities, especially sulfuric and nitric acids usage in the upper-middle reaches of Wujiang River, China. The carbonic acid would be substituted by protons from sulfuric and nitric acids which can be reduce CO2 absorption. Therefore, The goal of this study was to highlight the impacts of sulfuric and nitric acids on carbonate dissolution and the associated deficit of CO2 uptaking during carbonate weathering...
May 25, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28618449/groundwater-quality-analysis-of-its-temporal-and-spatial-variability-in-a-karst-aquifer
#17
Roger Pacheco Castro, Julia Pacheco Ávila, Ming Ye, Armando Cabrera Sansores
This study develops an approach based on hierarchical cluster analysis for investigating the spatial and temporal variation of water quality governing processes. The water quality data used in this study were collected in the karst aquifer of Yucatan, Mexico, the only source of drinking water for a population of nearly two million people. Hierarchical cluster analysis was applied to the quality data of all the sampling periods lumped together. This was motivated by the observation that, if water quality does not vary significantly in time, two samples from the same sampling site will belong to the same cluster...
June 15, 2017: Ground Water
https://www.readbyqxmd.com/read/28618357/visualisation-study-on-pseudomonas-migulae-an-1-transport-in-saturated-porous-media
#18
Dan Qu, Hejun Ren, Rui Zhou, Yongsheng Zhao
Influence of granular size and groundwater flow rate on transport of Pseudomonas migulae AN-1 in saturated porous media was non-invasively and visually investigated with a novel imaging technique based on our previously established green fluorescent protein-tagging approach. AN-1 was transported faster than water was. The finer the media were, the greater the enhancement of bacterial velocity was. Mass recovery (MR) increased, while deposition rate coefficient (Kc) decreased, with increasing granular size. Similar and linear trends of MR and Kc, respectively, were quantitatively observed with increasing water flow rate...
June 7, 2017: Water Research
https://www.readbyqxmd.com/read/28617596/review-of-organic-wastewater-compound-concentrations-and-removal-in-onsite-wastewater-treatment-systems
#19
Laurel A Schaider, Kathryn M Rodgers, Ruthann A Rudel
Onsite wastewater treatment systems, such as septic systems, serve 20% of U.S. households and are common in areas not served by wastewater treatment plants (WWTPs) globally. They can be sources of nutrients and pathogen pollution and have been linked to health effects in communities where they contaminate drinking water. However, few studies have evaluated their ability to remove organic wastewater compounds (OWCs) such as pharmaceuticals, hormones, and detergents. We synthesized results from 20 studies of 45 OWCs in conventional drainfield-based and alternative onsite wastewater treatment systems to characterize concentrations and removal...
June 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28616741/ecological-risk-assessment-of-an-open-dumping-site-at-mehmood-booti-lahore-pakistan
#20
Asifa Alam, Amtul Bari Tabinda, Abdul Qadir, Talib E Butt, Sidra Siddique, Adeel Mahmood
A robust risk assessment of Mehmood Booting Open Dumping (MBOD) site has been carried out by developing holistic risk assessment framework. Framework mainly comprises on baseline study, hazard identification, and risk quantification and evaluation. Physico-chemical analysis of groundwater and leachate, health risk assessment, and estimation of gas emissions from the site were carried out for risk evaluation. LandGEM 3.02 modelling software was used to measure the gas emissions. Analysis of leachate showed that all parameters were exceeding the WHO standard limit...
June 15, 2017: Environmental Science and Pollution Research International
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