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https://www.readbyqxmd.com/read/28924917/high-heterogeneity-in-soil-composition-and-quality-in-different-mangrove-forests-of-venezuela
#1
X L Otero, A Méndez, G N Nóbrega, T O Ferreira, W Meléndez, F Macías
Mangrove forests play an important role in biogeochemical cycles of metals, nutrients, and C in coastal ecosystems. However, these functions could be strongly affected by the mangrove soil degradation. In this study, we performed an intensive sampling characterizing mangrove soils under different types of environment (lagoon/gulf) and vegetation (Rhizophora/Avicennia/dead mangrove) in the Venezuelan coast. To better understand the spatial heterogeneity of the composition and characteristics of the soils, a wide range of the soil attributes were analyzed...
September 18, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28923753/concentration-and-spatial-distribution-of-organophosphate-esters-in-the-soil-sediment-profile-of-kathmandu-valley-nepal-implication-for-risk-assessment
#2
Ishwar Chandra Yadav, Ningombam Linthoingambi Devi, Jun Li, Gan Zhang, Adrian Covaci
Despite the fact that soil and sediments, which act as a sink or potential source of organic pollutants, have been polluted with organophosphate esters (OPEs) around the globe, extremely constrained data is accessible on environmental concentration and fate of OPEs in solid matrices in whole of the South Asia particularly if there should be an occurrence in Nepal. In this study, surface soil (N=19) and sediments samples (N=20) were analyzed for eight different OPE in Kathmandu Valley during October 2014. The concentration of ∑8OPE measured in sediments samples was 12 times higher than soil and ranged 983-7460ng/g dw (median 2210ng/g dw) and 65-27,500ng/g dw (186ng/g dw), respectively...
September 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28923748/controllable-mullite-bismuth-ferrite-micro-nanostructures-with-multifarious-catalytic-activities-for-switchable-hybrid-catalytic-degradation-processes
#3
Zhong-Ting Hu, Wen-Da Oh, Yiquan Liu, En-Hua Yang, Teik-Thye Lim
In this work, controllable preparation of micro/nanostructured bismuth ferrites (BFOs) were used to investigate multifarious heterogeneous catalyses, including Fenton/Fenton-like reaction, photocatalysis, photo-Fenton oxidation, and peroxymonosulfate (PMS) activation. Results showed that BFO can be used asa novel catalyst to activate switchable catalytic degradation of organic matters. Additionally, a novel catalytic system for degradation of organic pollutants, which integrating all-above heterogeneous catalyses is denoted as BFO/H2O2/PMS hybrid reaction, is introduced for the first time...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923297/quick-analysis-of-organic-matter-in-soil-by-energy-dispersive-x-ray-fluorescence-and-multivariate-analysis
#4
Franslley Morona, Felipe R Dos Santos, André M Brinatti, Fábio L Melquiades
The rapid, simple and accurate determination of soil quality indicators is fundamental for improvements in precision agriculture and consequently in production efficiency. The objectives of this study were to determine the organic matter (OM) and total organic carbon (TOC) concentrations in agricultural soil and to discriminate soil provenance by energy-dispersive X-ray fluorescence (EDXRF) combined with principal component analysis and partial least square regression. The conventional methods used for the determination of OM and TOC concentrations are the gravimetric and Walkley-Black methods, respectively...
September 8, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28920759/spatial-distribution-of-polycyclic-aromatic-hydrocarbon-and-polychlorinated-biphenyl-sources-in-the-nakdong-river-estuary-south-korea
#5
Jun H Lee, Han J Woo, Kap S Jeong, Jeong W Kang, Jae U Choi, Eun J Jeong, Kap S Park, Dong H Lee
Our research team investigated the elemental composition and the presence of various toxic organic compounds, such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), in estuary surface sediments to trace the spatial distribution of the sources of pollution deposited in Nakdong River, Busan, South Korea. The spatial patterns of elemental composition and toxic organic compounds were determined from the measurements of total organic carbon (TOC), total nitrogen, total sulfur, PAHs, and PCBs...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28918006/factors-influencing-organochlorine-pesticides-distribution-in-the-brisbane-river-estuarine-sediment-australia
#6
Godfred Odame Duodu, Ashantha Goonetilleke, Godwin A Ayoko
Sediment samples collected from Brisbane River were analysed for organochlorine pesticide residues (OCPs). The factors influencing OCPs distribution in the sediment were investigated using multivariate analytical tools. Thirteen OCPs were detected in the sediment with concentrations ranging between below detection to 83.9ng/g, and detection frequency >90%. With the exception of dieldrin, the OCP inputs appear to be historical and may cause adverse ecological impacts. Multi-criteria ranking of the factors influencing the OCPs (except dieldrin) distribution in the sediment revealed that TOC>silt>intensive urban land use>population>seasons...
September 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28917181/-137-cs-and-plutonium-isotopes-accumulation-retention-in-bottom-sediments-and-soil-in-lithuania-a-case-study-of-the-activity-concentration-of-anthropogenic-radionuclides-and-their-provenance-before-the-start-of-operation-of-the-belarusian-nuclear-power-plant
#7
D Marčiulionienė, B Lukšienė, D Montvydienė, O Jefanova, J Mažeika, R Taraškevičius, R Stakėnienė, R Petrošius, E Maceika, N Tarasiuk, Z Žukauskaitė, L Kazakevičiūtė, M Volkova
Knowledge of the background activity concentrations of anthropogenic radionuclides before the start of operations of the new nuclear facilities in Belarus is of great value worldwide. Inland water bodies in Lithuania (specifically the Neris River, the Nemunas River and the Curonian Lagoon) are near the site of the Belarusian NPP under construction and, for this reason, sediments and flooded soils from these sensitive areas were analysed for radiocesium and plutonium isotopes (macrophytes were analysed only for (137)Cs) in 2011-2012...
September 13, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28905281/enhanced-degradation-of-acid-red-1-dye-using-a-coupled-system-of-zero-valent-iron-nanoparticles-and-sonolysis
#8
Shoniya Thomas, Sijumon V Abraham, Usha K Aravind, Charuvila T Aravindakumar
The heterogeneous catalytic degradation of a model azo dye, acid red 1 (AR1), initiated by zero valent iron nanoparticles (ZVINP), and its synergic effect with ultrasound (US) have been investigated in the present study. The treatment of AR1 using ZVINP at pH 3 showed maximum efficiency in terms of colour removal (53.0%) and mineralization (48.5% TOC reduction) after 25 min of reaction. However, the coupling of this system with US showed an enhanced efficiency against the decolourization and mineralization of AR1...
September 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28904738/total-oxidant-and-antioxidant-status-in-prepubertal-children-with-obesity
#9
Grażyna Rowicka, Hanna Dyląg, Jadwiga Ambroszkiewicz, Agnieszka Riahi, Halina Weker, Magdalena Chełchowska
AIMS: Obesity is accompanied by the formation of oxygen free radicals, whose intensified activity without effective defense mechanisms can lead to oxidative stress and related complications. We evaluated the presence of oxidative stress in obese prepubertal children. METHODS: The study included 83 healthy children aged 2-10 years (62 with obesity and 21 nonobese controls). Total oxidant capacity (TOC), total antioxidant capacity (TAC), oxidized low-density lipoprotein (ox-LDL), lipid parameters, glucose, and C-reactive protein (CRP) were measured in serum...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28900306/effect-of-hno3-concentration-on-a-novel-silica-based-adsorbent-for-separating-pd-ii-from-simulated-high-level-liquid-waste
#10
Guo Ge, Xu Yuanlai, Yang Xinxin, Wang Fen, Zhou Fang, Yu Junxia, Chi Ruan
A new kind of silica-based (Crea + TODGA)/SiO2-P adsorbent with high selectivity adsorption for palladium (Pd) was synthesized to examined the applicability for partitioning process of high level liquid waste (HLLW). Adsorption behavior of Pd(II) towards (Crea + TODGA)/SiO2-P adsorbent and stability of adsorbent against HNO3 solution were investigated by batch method. The degradation parts of (Crea + TODGA)/SiO2-P dissolved in liquid phase were estimated by total organic carbon (TOC) analyzer. (Crea + TODGA)/SiO2-P adsorbent showed good selectivity adsorption for Pd(II) and reached equilibrium within 24 hr...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28898949/efficiencies-and-mechanisms-of-zsm5-zeolites-loaded-with-cerium-iron-or-manganese-oxides-for-catalytic-ozonation-of-nitrobenzene-in-water
#11
Chunmao Chen, Xin Yan, Brandon A Yoza, Tingting Zhou, Yang Li, Yali Zhan, Qinghong Wang, Qing X Li
Discharge of industrial wastewater causes water pollution. It is therefore necessary to treat wastewater prior to discharge. Catalytic ozonation processes (COP) using ZSM5 zeolites loaded with metallic (Ce, Fe, or Mn) oxides to remove nitrobenzene from water were investigated. The total organic carbon (TOC) removal by the COP treatment with NaZSM5-38, HZSM5-38, and NaZSM5-100 were increased by 6.7%, 23.1%, and 19.8%, respectively, in comparison with single ozonation efficiency (39.2%). The loadings of Ce, Fe, or Mn oxides increased the catalytic activity relative to ZSM5 zeolites alone...
September 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28898848/comparative-evaluation-of-piggery-wastewater-treatment-in-algal-bacterial-photobioreactors-under-indoor-and-outdoor-conditions
#12
Dimas García, Esther Posadas, Carlos Grajeda, Saúl Blanco, Sonia Martínez-Páramo, Gabriel Acién, Pedro García-Encina, Silvia Bolado, Raúl Muñoz
This work evaluated the performance of four open algal-bacterial photobioreactors operated at ≈26days of hydraulic retention time during the treatment of 10 (×10) and 20 (×20) times diluted piggery wastewater (PWW) under indoor (I) and outdoor (O) conditions for four months. The removal efficiencies (REs) of organic matter, nutrients and zinc from PWW, along with the dynamics of biomass concentration and structure of algal-bacterial population were assessed. The highest TOC-RE, TP-RE and Zn-RE (94±1%, 100% and 83±2%, respectively) were achieved indoors in ×10 PWW, while the highest TN-RE (72±8%) was recorded outdoors in ×10 PWW...
August 24, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28898835/assessment-upon-heterotrophic-microalgae-screened-from-wastewater-microbiota-for-concurrent-pollutants-removal-and-biofuel-production
#13
Liang Shen, Jean Damascene Ndayambaje, Theophile Murwanashyaka, Wenqian Cui, Emmanuel Manirafasha, Cuixue Chen, Yuanpeng Wang, Yinghua Lu
Heterotrophic microalgae, capable of converting organic carbons to biofuel, as well as assimilating nutrients, have a great prospective in wastewater treatment. Meanwhile, the knowledge about heterotrophic microalgae is still far less than the autotrophic conterpart. Hence, in this study, 20 heterotrophic microalgal strains were isolated from a domestic wastewater treatment plant, and identified according to morphology and partial 18S and 23S rRNA gene sequences. Further, their biological traits were assessed in terms of N, P, TOC removal efficiencies, growth parameters, self-settleability and lipids production, expressed through a comprehensive selection index...
August 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28892848/source-dynamics-of-radiocesium-contaminated-particulate-matter-deposited-in-an-agricultural-water-reservoir-after-the-fukushima-nuclear-accident
#14
Sylvain Huon, Seiji Hayashi, J Patrick Laceby, Hideki Tsuji, Yuichi Onda, Olivier Evrard
The Fukushima nuclear accident in Japan resulted in the deposition of radiocesium over forested and rural landscapes northwest of the power plant. Although there have been several investigations into the dynamics of contaminated river sediment, less attention has been paid to the sources of deposited particulate matter in dams and reservoirs. In the Fukushima Prefecture, there are 10 significant dams and over a 1000 reservoirs for both agricultural and surface water management. These reservoirs may have trapped a significant volume of radiocesium-contaminated sediment...
September 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28892797/study-of-the-intensification-of-solar-photo-fenton-degradation-of-carbamazepine-with-ferrioxalate-complexes-and-ultrasound
#15
A J Expósito, J M Monteagudo, A Durán, I San Martín, L González
The intensification of the solar photo-Fenton system with ferrioxalate photoactive complexes and ultrasound applied to the mineralization of 15mg/L carbamazepine aqueous solution (CBZ) was evaluated. The experiments were carried out in a solar compound parabolic collector (CPC) pilot plant reactor coupled to an ultrasonic processor. The dynamic behavior of hydroxyl radicals generated under the different studied reaction systems was discussed. The initial concentrations of hydrogen peroxide and ferrous/oxalic acid and pH were found to be the most significant variables (32...
August 30, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28888860/natural-soil-mediated-photo-fenton-like-processes-in-treatment-of-pharmaceuticals-batch-and-continuous-approach
#16
Rahil Changotra, Himadri Rajput, Amit Dhir
This paper manifests the potential viability of soil as a cost-free catalyst in photo-Fenton-like processes for treating pharmaceuticals at large scale. Naturally available soil without any cost intensive modification was utilized as a catalyst to degrade pharmaceuticals, specifically ornidazole (ORZ) and ofloxacin (OFX). Soil was characterized and found enriched with various iron oxides like hematite, magnetite, goethite, pyrite and wustite, which contributes toward enhanced dissolution of Fe(3+) than Fe(2+) in the aqueous solution resulting in augmented rate of photo-Fenton reaction...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28886976/the-degradation-processes-of-refractory-substances-in-nanofiltration-concentrated-leachate-using-micro-ozonation
#17
Hui Wang, Yunhai Wang, Ziyang Lou, Nanwen Zhu, Haiping Yuan
Concentrated leachate (CL) is the byproduct of leachate treated by the membrane separation unit after bio-treatment processes, and contains many humic-like substances. Ozonation processes were applied and optimized for the further removal of those refractory matters in this work. Micro-bubble ozonation (MB-O3) possessed the best performance, and 76.0% and 69.9% of COD and TOC were found to be removed under the optimum conditions with ozone dosage of 2.4g/L, initial pH of 9 and reaction time of 120min. The reaction rate k in MB-O3 was 0...
September 5, 2017: Waste Management
https://www.readbyqxmd.com/read/28884172/a-4-dimethylaminobenzoate-functionalized-ti6-oxo-cluster-with-a-narrow-band-gap-and-enhanced-photoelectrochemical-activity-a-combined-experimental-and-computational-study
#18
Hai-Ting Lv, Ying Cui, Yu-Min Zhang, Hua-Min Li, Guo-Dong Zou, Rui-Huan Duan, Jun-Tao Cao, Qiang-Shan Jing, Yang Fan
Organic donor-π-bridge-acceptor (D-π-A) dyes with arylamines as an electron donor have been widely used as photosensitizers for dye-sensitized solar cells (DSSCs). However, titanium-oxo clusters (TOCs) functionalized with this kind of D-π-A structured dye-molecule have rarely been explored. In the present study, the 4-dimethylaminobenzoate-functionalized titanium-oxo cluster [Ti6(μ3-O)6(OiPr)6(DMABA)6]·2C6H5CH3 (DMABA = 4-dimethylaminobenzoate) was synthesized and structurally characterized by single-crystal X-ray diffraction...
September 28, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28881241/degradation-of-acid-orange-7-using-peroxymonosulfate-catalyzed-by-granulated-activated-carbon-and-enhanced-by-electrolysis
#19
Jing Li, Heng Lin, Kangmeng Zhu, Hui Zhang
Electrochemistry coupled with granulated activated carbon catalysis of peroxymonosulfate (electro/GAC/PMS) as a novel wastewater treatment process was performed for the degradation of Acid Orange 7 (AO7) in aqueous solution. The decolorization of AO7 was compared under different permutations and combinations of electro-oxidation, GAC and PMS. It showed that the electro/GAC/PMS process was the most effective and the decolorization of AO7 followed pseudo-first order kinetics. The surface chemistry of GAC samples was analyzed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy...
August 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/28875390/core-curriculum-illustration-pulmonary-laceration
#20
Daniel Carson, Rachael Edwards
This is the 44th installment of a series that will highlight one case per publication issue from the bank of cases available online as part of the American Society of Emergency Radiology (ASER) educational resources. Our goal is to generate more interest in and use of our online materials. To view more cases online, please visit the ASER Core Curriculum and Recommendations for Study online at: http://www.erad.org/page/CCIP_TOC .
September 5, 2017: Emergency Radiology
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