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https://www.readbyqxmd.com/read/29779189/environmental-factors-determining-the-accumulation-of-metals-cu-zn-mn-and-fe-in-tissues-of-taraxacum-sp-sect-taraxacum
#1
Elżbieta Królak, Jolanta Marciniuk, Katarzyna Popijantus, Paulina Wasilczuk, Zbigniew Kasprzykowski
The genus Taraxacum is used in the assessment of soil contamination with heavy metals. There are relatively few studies using sections or species representing this genus. The presented research was conducted in Poland on two habitats, varied in terms of nutrients and metals content. The content of selected metals in leaves and roots of Taraxacum sect. Taraxacum was determined. It was found that in the conditions of increased content of metals in the soil, the analysed species representing sect. Taraxacum accumulate higher amounts of metals in their leaves and roots...
May 19, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29779079/preparation-and-adsorption-characteristics-for-heavy-metals-of-active-silicon-adsorbent-from-leaching-residue-of-lead-zinc-tailings
#2
Chang Lei, Bo Yan, Tao Chen, Xian-Ming Xiao
To comprehensively reuse the leaching residue obtained from lead-zinc tailings, an active silicon adsorbent (ASA) was prepared from leaching residue and studied as an adsorbent for copper(II), lead(II), zinc(II), and cadmium(II) in this paper. The ASA was prepared by roasting the leaching residue with either a Na2 CO3 /residue ratio of 0.6:1 at 700 °C for 1 h or a CaCO3 /residue ratio of 0.8:1 at 800 °C for 1 h. Under these conditions, the available SiO2 content of the ASA was more than 20%. The adsorption behaviors of the metal ions onto the ASA were investigated and the Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models were used to analyze the adsorption isotherm...
May 19, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29778956/health-risk-assessment-of-heavy-metals-in-atmospheric-deposition-in-a-congested-city-environment-in-a-developing-country-kandy-city-sri-lanka
#3
Lakshika Weerasundara, D N Magana-Arachchi, Abdul M Ziyath, Ashantha Goonetilleke, Meththika Vithanage
This research study which was undertaken in a congested city environment in a developing country provides a robust approach for the assessment and management of human health risk associated with atmospheric heavy metals. The case study area was Kandy City, which is the second largest city in Sri Lanka and bears the characteristics of a typical city in the developing world such as the urban footprint, high population density and traffic congestion. Atmospheric deposition samples were collected on a weekly basis and analyzed for nine heavy metals common to urban environments, namely, Al, Cr, Mn, Fe, Ni, Cu, Zn, Cd and Pb...
May 17, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29778831/black-plastics-linear-and-circular-economies-hazardous-additives-and-marine-pollution
#4
REVIEW
Andrew Turner
Black products constitute about 15% of the domestic plastic waste stream, of which the majority is single-use packaging and trays for food. This material is not, however, readily recycled owing to the low sensitivity of black pigments to near infrared radiation used in conventional plastic sorting facilities. Accordingly, there is mounting evidence that the demand for black plastics in consumer products is partly met by sourcing material from the plastic housings of end-of-life waste electronic and electrical equipment (WEEE)...
May 17, 2018: Environment International
https://www.readbyqxmd.com/read/29778685/methodology-of-spatial-risk-assessment-for-arsenic-species-associated-with-sampling-and-analysis-results-optimization
#5
Yimei Zhang, Liqun Wang, Jie Chen, Yalong Zhao, Yuxian Lai, Panpan Wu
The conventional risk assessment methods may be defective for more effective health risk assessment due to ignoring heavy metal species and the accuracy and integrity of sampling and analysis results. Using the accurate and integral data to quantify the human health effects of metal species can provide great support for more effective health risk assessment. This study presents a new methodology to optimize sampling and analysis results for implementing the spatial human health risk of heavy metal species in contaminated sites...
May 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29778679/efficient-metal-adsorption-and-microbial-reduction-from-rawal-lake-wastewater-using-metal-nanoparticle-coated-cotton
#6
Attarad Ali, Ayesha Gul, Abdul Mannan, Muhammad Zia
This study was designed to investigate removal of toxic metals and reduction of bacterial count from Rawal Lake wastewater with novel nanocomposite sorbents. Iron, zinc and silver oxide nanoparticles (NPs) were attached on cotton. The nanocomposites (iron NPs on cotton (FeCt), zinc NPs on cotton (ZnCt) and silver NPs on cotton (AgCt)) were characterized by FTIR, XRD and SEM, which showed successful adsorption of 10-30 nm size nanoparticles. Batch experiments were performed to determine the adsorption capacity of nanocomposite for metal removal...
May 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29778678/manure-digestate-storage-under-different-conditions-chemical-characteristics-and-contaminant-residuals
#7
Yun Li, Hang Liu, Guoxue Li, Wenhai Luo, Ying Sun
In this study, chemical characteristics and contaminant residuals in livestock manure digestate were investigated during storage under different conditions. Results show that storing digestate openly under the mesophilic condition (30 ± 1 °C) led to water evaporation and thus considerable mass reduction. As a result, concentrative effect occurred to increase the contents of organic matter, nutrients, and heavy metals during digestate storage. By contrast, ammonium (NH4 + ) concentration in digestate decreased over storage period...
May 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29778156/preparation-and-characterization-of-a-novel-hybrid-chelating-material-for-effective-adsorption-of-cu-ii-and-pb-ii
#8
Ya Liu, Peng Qian, Yang Yu, Bo Yu, Yongliang Wang, Shufeng Ye, Yunfa Chen
The discharge of heavy metal ions such as Cu2+ and Pb2+ poses a severe threat to public health and the environment owing to their extreme toxicity and bioaccumulation through food chains. Herein, we report a novel organic-inorganic hybrid adsorbent, Al(OH)3 -poly(acrylamide-dimethyldiallylammonium chloride)-graft-dithiocarbamate (APD), for rapid and effective removal of Cu2+ and Pb2+ . In this adsorbent, the "star-like" structure of Al(OH)3 -poly(acrylamide-dimethyldiallylammonium chloride) served as the support of dithiocarbamate (DTC) functional groups for easy access of heavy metal ions and assisted development of large and compact floccules...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29778154/effects-of-chlortetracycline-cu-and-their-combination-on-the-performance-and-microbial-community-dynamics-in-swine-manure-anaerobic-digestion
#9
Rui Wang, Junya Zhang, Jibao Liu, Dawei Yu, Hui Zhong, Yawei Wang, Meixue Chen, Juan Tong, Yuansong Wei
Swine manure was typical for the combined pollution of heavy metals and antibiotics. The effects of widely used veterinary antibiotic chlortetracycline (CTC), Cu and their combination on swine manure anaerobic digestion performance and microbial community have never been investigated. Thus, four 2L anaerobic digestion reactors were established including reactor A (control), B (CTC spiked by 0.5g/kg dry weight, dw), C (Cu spiked by 5g/kg dw) and D (combination of CTC, 0.5g/kg dw, and Cu, 5g/kg dw), and dynamics of bacterial and archaeal community structure was investigated using high throughput sequencing method...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29778076/design-and-synthesis-of-core-shell-fe-3-o-4-ptmt-composite-magnetic-microspheres-for-adsorption-of-heavy-metals-from-high-salinity-wastewater
#10
Xin Huang, Jinyue Yang, Jingkang Wang, Jingtao Bi, Chuang Xie, Hongxun Hao
In this study, a novel magnetic nanoparticles (MNP) modified by an organodisulfide polymer (PTMT) was designed for adsorption of heavy metals (Hg(II), Pb(II) and Cd(II)) from simulated coal chemical high salinity wastewater. The MNP-PTMT nano-composite was synthesize and characterized by SEM, TEM, FTIR, BET, VSM, TGA and XRD. The results indicate that the wanted MNP-PTMT magnetic nanoparticles were successfully obtained by modification. Adsorption experiments were systematically carried out to evaluate the performance of the obtained nanoparticles and to build up the adsorption models...
May 10, 2018: Chemosphere
https://www.readbyqxmd.com/read/29778056/one-century-sedimentary-record-of-heavy-metal-pollution-in-western-taihu-lake-china
#11
Yan Li, Shenglu Zhou, Qing Zhu, Baojie Li, Junxiao Wang, Chunhui Wang, Lian Chen, Shaohua Wu
Long-term trends of sediment compositions are important for assessing the impact of human activities on the sediment and protecting the sediment environment. In this study, based on the contents of heavy metals and the Pb isotope ratios in lake sediments, atmospheric dustfall and soil in Yixing, China, the representative heavy metals (Zn, Pb, Cr and Cd) in lake sediments from western Taihu Lake were studied. The evolution history of heavy metals in the local environment was constructed for the past 100 years...
May 16, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29778047/source-identification-and-spatial-distribution-of-arsenic-and-heavy-metals-in-agricultural-soil-around-hunan-industrial-estate-by-positive-matrix-factorization-model-principle-components-analysis-and-geo-statistical-analysis
#12
Xiaowen Zhang, Shuai Wei, Qianqian Sun, Syed Abdul Wadood, Boli Guo
Characterizing the distribution and defining potential sources of arsenic and heavy metals are the basic preconditions for reducing the contamination of heavy metals and metalloids. 71 topsoil samples and 61 subsoil samples were collected by grid method to measure the concentration of cadmium (Cd), arsenic (As), lead (Pb), copper (Cu), zinc (Zn), nickel (Ni) and chromium (Cr). Principle components analysis (PCA), GIS-based geo-statistical methods and Positive Matrix Factorization (PMF) were applied. The results showed that the mean concentrations were 9...
May 16, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29778038/hierarchically-three-dimensional-3d-nanotubular-sea-urchin-shaped-iron-oxide-and-its-application-in-heavy-metal-removal-and-solar-induced-photocatalytic-degradation
#13
Soon Chang Lee, Yesul Jeong, Youn Jung Kim, Hyeran Kim, Hyun Uk Lee, Young-Chul Lee, Sang Moon Lee, Hae Jin Kim, Ha-Rim An, Myoung Gyu Ha, Go-Woon Lee, Young-Seak Lee, Gaehang Lee
In this study, hierarchically three-dimensional (3D) nanotubular sea urchin-shaped iron oxide nanostructures (3D-Fe2 O3 ) were synthesized by a facile and rapid ultrasound irradiation method. Additives, templates, inert gas atmosphere, pH regulation, and other complicated procedures were not required. Dense 3D-Fe2 O3 with a relatively large Brunauer-Emmett-Teller (BET) surface area of 129.4 m2 /g was synthesized within 23 min, and the BET surface area was further improved to 282.7 m2 /g by a post heat-treatment process...
April 23, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29778028/functional-lignocellulosic-material-for-the-remediation-of-copper-ii-ions-from-water-towards-the-design-of-a-wood-filter
#14
Selin Vitas, Tobias Keplinger, Nico Reichholf, Renato Figi, Etienne Cabane
In this study, the chemical modification of bulk beech wood is described along with its utilization as biosorbent for the remediation of copper from water. The material was prepared by esterification using anhydrides, and reaction conditions were optimized to propose a greener process, in particular by reducing the amount of solvent. This modification yields a lignocellulosic material whose native structure is preserved, with an increased amount of carboxylic groups (up to 3 mmol/g). We demonstrate that the material can remove up to 95% of copper from low concentration solutions (100- 500 ppm)...
May 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29777921/comparison-of-heavy-metals-parasites-and-histopathology-in-sculpins-myoxocephalus-spp-from-two-sites-at-a-lead-zinc-mine-in-north-east-greenland
#15
Rasmus Dyrmose Nørregaard, Mai Dang, Lis Bach, Ole Geertz-Hansen, Kim Gustavson, Peter Aastrup, Pall S Leifsson, Jens Søndergaard, Barbara Nowak, Christian Sonne
The former lead-zinc mine at Mestersvig, Greenland, continues to contaminate the surrounding environment despite its operations ceasing over 50 years ago. Elevated concentrations of heavy metals are found in water, sediment and biota in the terrestrial, freshwater and marine environments. To shed light on the present contamination and its potential effects on local fish we investigated gill and liver histology of sculpins (Myoxocephalus spp.) around the former mining area. Two species of sculpins were caught; shorthorn sculpins (M...
May 16, 2018: Environmental Research
https://www.readbyqxmd.com/read/29777524/mercury-involvement-in-neuronal-damage-and-in-neurodegenerative-diseases
#16
REVIEW
Veronica Lanza Cariccio, Annalisa Samà, Placido Bramanti, Emanuela Mazzon
Neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, and multiple sclerosis are characterized by a chronic and selective process of neuronal cell death. Although the causes of neurodegenerative diseases remain still unknown, it is now a well-established idea that more factors, such as genetic, endogenous, and environmental, are involved. Among environmental causes, the accumulation of mercury, a heavy metal considered a toxic agent, was largely studied as a probable factor involved in neurodegenerative disease course...
May 18, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29776592/response-to-metals-treatment-of-fra1-a-member-of-the-ap-1-transcription-factor-family-in-p-lividus-sea-urchin-embryos
#17
Roberta Russo, Rosa Bonaventura, Marco Chiaramonte, Caterina Costa, Valeria Matranga, Francesca Zito
Lithium (Li), Nickel (Ni), and Zinc (Zn) are metals normally present in the seawater, although they can have adverse effects on the marine ecosystem at high concentrations by interfering with many biological processes. These metals are toxic for sea urchin embryos, affecting their morphology and developmental pathways. In particular, they perturb differently the correct organization of the embryonic axes (animal-vegetal, dorso-ventral): Li is a vegetalizing agent and Ni disrupts the dorso-ventral axis, while Zn has an animalizing effect...
May 5, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29775854/a-wavelength-modulated-localized-surface-plasmon-resonance-lspr-optical-fiber-sensor-for-sensitive-detection-of-mercury-ii-ion-by-gold-nanoparticles-dna-conjugates
#18
Shuo Jia, Chao Bian, Jizhou Sun, Jianhua Tong, Shanhong Xia
The study presented herein investigated an easy preparation, high performance, wavelength-modulated LSPR optical fiber chemosensor coated by gold nanospheres(AuNS) for Hg2+ detection based on thymine-Hg2+ -thymine base pair mismatches and the coupled plasmonic resonance effect.Utilizing electrostatic self-assembly method, the high density and dispersivity monolayer AuNS coated LSPR fiber sensor had the near field refractive index sensitivity up to 2016 nm/RIU. The single-strand probe DNA served as a binding element for free AuNS labelled-target DNA conjugates was attached to the monolayer AuNS by Au-S bond...
May 8, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775349/tuning-the-pairing-interaction-in-a-d-wave-superconductor-by-paramagnons-injected-through-interfaces
#19
M Naritsuka, P F S Rosa, Yongkang Luo, Y Kasahara, Y Tokiwa, T Ishii, S Miyake, T Terashima, T Shibauchi, F Ronning, J D Thompson, Y Matsuda
Unconventional superconductivity and magnetism are intertwined on a microscopic level in a wide class of materials. A new approach to this most fundamental and hotly debated issue focuses on the role of interactions between superconducting electrons and bosonic fluctuations at the interface between adjacent layers in heterostructures. Here we fabricate hybrid superlattices consisting of alternating atomic layers of the heavy-fermion superconductor CeCoIn_{5} and antiferromagnetic (AFM) metal CeRhIn_{5}, in which the AFM order can be suppressed by applying pressure...
May 4, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29775107/heavy-metals-contamination-and-accumulation-in-submerged-macrophytes-in-an-urban-river-in-china
#20
Guangqiu Lu, Bei Wang, Cuiping Zhang, Shuying Li, Jiliang Wen, Guoli Lu, Chunrong Zhu, Yuanqing Zhou
Deteriorating urban water quality has attracted considerable attention in China. We investigated the contamination levels and distribution of heavy metals (As, Cd, Cu, Ni, Pb, and Zn) in Yuxi River water and sediments, and assessed the heavy metal accumulation capability of five species of submerged macrophytes: Vallisneria natans (Lour.) Hara, Potamogeton pectinatus L., Hydrilla verticillata (L. f.) Royle, Myriophyllum spicatum L., and Potamogeton crispus L. Samples were collected from upstream and downstream locations in different season...
July 3, 2018: International Journal of Phytoremediation
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