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https://www.readbyqxmd.com/read/29145639/assessment-of-intake-according-to-ideas-guidance-case-study
#1
A Bitar, M Maghrabi
Estimation of radiation intake and internal dose can be carried out through direct or indirect measurements during routine or special monitoring program. In case of Iodine-131 contamination, direct measurements, such as thyroid counting, are fast and efficient to give quick results. Generally, the calculation method implements suitable values for known parameters whereas default values are used if no information is available. However, in view to avoid significant discrepancies, IDEAS guidelines put in route a comprehensive method to evaluate the monitoring data for one and different types of monitoring...
November 14, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29145477/the-abundance-of-health-associated-bacteria-is-altered-in-pah-polluted-soils-implications-for-health-in-urban-areas
#2
Anirudra Parajuli, Mira Grönroos, Sari Kauppi, Tomasz Płociniczak, Marja I Roslund, Polina Galitskaya, Olli H Laitinen, Heikki Hyöty, Ari Jumpponen, Rauni Strömmer, Martin Romantschuk, Nan Hui, Aki Sinkkonen
Long-term exposure to polyaromatic hydrocarbons (PAHs) has been connected to chronic human health disorders. It is also well-known that i) PAH contamination alters soil bacterial communities, ii) human microbiome is associated with environmental microbiome, and iii) alteration in the abundance of members in several bacterial phyla is associated with adverse or beneficial human health effects. We hypothesized that soil pollution by PAHs altered soil bacterial communities that had known associations with human health...
2017: PloS One
https://www.readbyqxmd.com/read/29145471/arbuscular-mycorrhizal-strategy-for-zinc-mycoremediation-and-diminished-translocation-to-shoots-and-grains-in-wheat
#3
Abdelghafar M Abu-Elsaoud, Nivien A Nafady, Ahmed M Abdel-Azeem
Mycoremediation is an on-site remediation strategy, which employs fungi to degrade or sequester contaminants from the environment. The present work focused on the bioremediation of soils contaminated with zinc by the use of a native mycorrhizal fungi (AM) called Funneliformis geosporum (Nicol. & Gerd.) Walker & Schüßler. Experiments were performed using Triticum aestivum L. cv. Gemmeza-10 at different concentrations of Zn (50, 100, 200 mg kg-1) and inoculated with or without F. geosporum. The results showed that the dry weight of mycorrhizal wheat increased at Zn stressed plants as compared to the non-Zn-stressed control plants...
2017: PloS One
https://www.readbyqxmd.com/read/29145427/do-microplastic-particles-affect-daphnia-magna-at-the-morphological-life-history-and-molecular-level
#4
Hannes K Imhof, Jakub Rusek, Michaela Thiel, Justyna Wolinska, Christian Laforsch
Microplastic particles are ubiquitous not only in marine but also in freshwater ecosystems. However, the impacts of microplastics, consisting of a large variety of synthetic polymers, on freshwater organisms remains poorly understood. We examined the effects of two polymer mixtures on the morphology, life history and on the molecular level of the waterflea Daphnia magna (three different clones). Microplastic particles of ~40 μm were supplied at a low concentration (1% of the food particles) leading to an average of ~30 particles in the digestive tract which reflects a high microplastic contamination but still resembles a natural situation...
2017: PloS One
https://www.readbyqxmd.com/read/29145143/biodegradation-of-polystyrene-wastes-in-yellow-mealworms-larvae-of-tenebrio-molitor-linnaeus-factors-affecting-biodegradation-rates-and-the-ability-of-polystyrene-fed-larvae-to-complete-their-life-cycle
#5
Shan-Shan Yang, Anja Malawi Brandon, James Christopher Andrew Flanagan, Jun Yang, Daliang Ning, Shen-Yang Cai, Han-Qing Fan, Zhi-Yue Wang, Jie Ren, Eric Benbow, Nan-Qi Ren, Robert M Waymouth, Jizhong Zhou, Craig S Criddle, Wei-Min Wu
Commercial production of polystyrene (PS) -a persistent plastic that is not biodegradable at appreciable rates in most environments-has led to its accumulation as a major contaminant of land, rivers, lakes, and oceans. Recently, however, an environment was identified in which PS is susceptible to rapid biodegradation: the larval gut of Tenebrio molitor Linnaeus (yellow mealworms). In this study, we evaluate PS degradation capabilities of a previously untested strain of T. molitor and assess its survival and PS biodegradation rates for a range of conditions (two simulated food wastes, three temperatures, seven PS waste types)...
October 23, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145139/application-and-microbial-ecology-of-psychrotrophs-in-domestic-wastewater-treatment-at-low-temperature
#6
Zhenzhen Xu, Yue Ben, Zhonglin Chen, Anxi Jiang, Jimin Shen, Xiaoyun Han
The feasibility of a bunch of screened psychrotrophs being applied to low-temperature wastewater treatment was investigated. The screened psychrophillic strains are capable of growth at a broad temperature-range from 0 to 40 °C and exhibit a preferable TTC-dehydrogenase activity at low temperature (4-10 °C). Along the sharply fluctuant temperatures (25-4-25 °C), the screened psychrotrophs (compared with the indigenous mesophiles) demonstrate less fluctuations of COD removal and more rapid recovery after temperature shocks...
October 24, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145136/lead-cadmium-and-arsenic-in-human-milk-and-their-socio-demographic-and-lifestyle-determinants-in-lebanon
#7
Maya Bassil, Farah Daou, Hussein Hassan, Osama Yamani, Joelle Abi Kharma, Zouheir Attieh, Jomana Elaridi
INTRODUCTION: Exposure of newborns to toxic metals is of special interest due to their reported contamination in breast milk and potential harm. The aim of this study was to assess the occurrence and factors associated with lead, cadmium and arsenic contamination in breast milk collected from lactating mothers in Lebanon. METHODS: A total of 74 breast milk samples were collected from primaparas according to guidelines set by the World Health Organization. A survey was administered to determine the demographic and anthropometric characteristics of participating lactating mothers...
October 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145129/high-contamination-in-the-areas-surrounding-abandoned-mines-and-mining-activities-an-impact-assessment-of-the-dilala-luilu-and-mpingiri-rivers-democratic-republic-of-the-congo
#8
Emmanuel K Atibu, Pierre Lacroix, Periyasamy Sivalingam, Nicolas Ray, Gregory Giuliani, Crispin K Mulaji, Jean-Paul Otamonga, Pius T Mpiana, Vera I Slaveykova, John Poté
Abandoned mines and mining activities constitute important sources of toxic metals and Rare Earth Elements (REEs) affecting surrounding environmental compartments and biota. This study investigates the contamination degree and distribution of toxic metals and REEs in contrasting sediment, soil and plant samples surrounding rivers in the African copperbelt area characterized by the presence of numerous abandoned mines, artisanal and industrial mining activities. ICP-MS results highlighted the highest concentration of Cu, Co and Pb in sediments reaching values of 146,801, 18,434 and 899 mg kg(-1), respectively...
October 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145113/denitrification-behavior-and-microbial-community-spatial-distribution-inside-woodchip-based-solid-phase-denitrification-w-spd-bioreactor-for-nitrate-contaminated-water-treatment
#9
Jiamin Zhao, Chuanping Feng, Shuang Tong, Nan Chen, Shanshan Dong, Tong Peng, Shunlong Jin
The NO3(-) removal pathway and microorganisms change along with the height of an up-flow W-SPD bioreactor was investigated in this study. Modeling and microbial community analysis were used to analyze the denitrification behavior in W-SPD bioreactor. The results showed that NO3(-) removal rate matched for zero-order (R(2) > 0.97) and first-order (R(2) > 0.94) combination Michaelis-Menten kinetics, whereas microbial reaction rate suited for modified logistic model (R(2) > 0.99). The excellent denitrification performance (92...
November 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29145102/remediation-of-a-soil-chronically-contaminated-with-hydrocarbons-through-persulfate-oxidation-and-bioremediation
#10
Rocío Medina, Pedro Maximiliano David Gara, Antonio José Fernández-González, Janina Alejandra Rosso, María Teresa Del Panno
The impact of remediation combining chemical oxidation followed by biological treatment on soil matrix and microbial community was studied, of a chronically hydrocarbon contaminated soil sourced from a landfarming treatment. Oxidation by ammonium persulfate produced a significant elimination of polycyclic aromatic hydrocarbons (PAHs) and an increase in PAH bioavailability. Organic-matter oxidation mobilized nutrients from the soil matrix. The bacterial populations were affected negatively, with a marked diminution in the diversity indices...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29145101/the-distribution-and-trends-of-persistent-organic-pollutants-and-mercury-in-marine-mammals-from-canada-s-eastern-arctic
#11
REVIEW
Tanya M Brown, Robie W Macdonald, Derek C G Muir, Robert J Letcher
Arctic contaminant research in the marine environment has focused on organohalogen compounds and mercury mainly because they are bioaccumulative, persistent and toxic. This review summarizes and discusses the patterns and trends of persistent organic pollutants (POPs) and mercury in ringed seals (Pusa hispida) and polar bears (Ursus maritimus) in the Eastern Canadian Arctic relative to the rest of the Canadian Arctic. The review provides explanations for these trends and looks at the implications of climate-related changes on contaminants in these marine mammals in a region that has been reviewed little...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29145088/phosphorus-recovery-and-leaching-of-trace-elements-from-incinerated-sewage-sludge-ash-issa
#12
Le Fang, Jiang-Shan Li, Ming Zhi Guo, C R Cheeseman, Daniel C W Tsang, Shane Donatello, Chi Sun Poon
Chemical extraction of phosphorus (P) from incinerated sewage sludge ash (ISSA) is adversely influenced by co-dissolution of metals and metalloids. This study investigated P recovery and leaching of Zn, Cu, Pb, As and Ni from ISSA using inorganic acids (sulphuric acid and nitric acid), organic acids (oxalic acid and citric acid), and chelating agents (ethylenediaminetetraacetic acid (EDTA) and ethylene diamine tetramethylene phosphonate (EDTMP)). The aim of this study was to optimize a leaching process to recover P-leachate with high purity for P fertilizer production...
November 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145085/analysis-of-microplastics-in-water-by-micro-raman-spectroscopy-release-of-plastic-particles-from-different-packaging-into-mineral-water
#13
Darena Schymanski, Christophe Goldbeck, Hans-Ulrich Humpf, Peter Fürst
Microplastics are anthropogenic contaminants which have been found in oceans, lakes and rivers. Investigations focusing on drinking water are rare and studies have mainly been using micro-Fourier Transform Infrared Spectroscopy (μ-FT-IR). A major limitation of this technique is its inability to detect particles smaller than 20 μm. However, micro-Raman spectroscopy is capable of detecting even smaller particle sizes. Therefore, we show that this technique, which was used in this study, is particularly useful in detecting microplastics in drinking water where particle sizes are in the low micrometer range...
November 6, 2017: Water Research
https://www.readbyqxmd.com/read/29145082/insights-into-arsenic-retention-dynamics-of-pleistocene-aquifer-sediments-by-in-situ-sorption-experiments
#14
Harald Neidhardt, Lenny H E Winkel, Ralf Kaegi, Caroline Stengel, Pham T K Trang, Vi M Lan, Pham H Viet, Michael Berg
The migration of arsenic (As) enriched groundwater into Pleistocene aquifers as a consequence of extensive groundwater abstraction represents an increasing threat to the precious water resources in Asian delta regions. Pleistocene aquifer sediments are typically rich in FeIII-(hydr)oxides and are capable to adsorb high amounts of As. This results in a pronounced accumulation of As in Pleistocene aquifers, where high As groundwater infiltrates from adjacent Holocene aquifers. However, As retention by Pleistocene aquifers over long-term time scales remains largely unknown...
November 7, 2017: Water Research
https://www.readbyqxmd.com/read/29145056/environmental-life-cycle-assessment-of-marine-sediment-decontamination-by-citric-acid-enhanced-microwave-heating
#15
Pietro P Falciglia, Carlo Ingrao, Guido De Guidi, Alfio Catalfo, Guglielmo Finocchiaro, Marcello Farina, Maria Liali, Giuseppe Lorenzano, Gaetano Valastro, Federico G A Vagliasindi
The potential ability of microwave heating (MWH) for the remediation of marine sediments affected by severe hydrocarbon (HC) contamination was investigated. Decontamination effectiveness and environmental sustainability through a comparative Life Cycle Assessment (LCA) were addressed. Main results revealed that the application of a 650-W MWH treatment resulted in a rapid (15min) HC removal. A citric acid (CA) dose of 0.1M led to enhanced-HC removals of 76.9, 96.5 and 99.7% after 5, 10 and 15min of MW irradiation, respectively...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29145014/ecotracer-analyzing-concentration-of-contaminants-and-radioisotopes-in-an-aquatic-spatial-dynamic-food-web-model
#16
William J Walters, Villy Christensen
Ecotracer is a tool in the Ecopath with Ecosim (EwE) software package used to simulate and analyze the transport of contaminants such as methylmercury or radiocesium through aquatic food webs. Ecotracer solves the contaminant dynamic equations simultaneously with the biomass dynamic equations in Ecosim/Ecospace. In this paper, we give a detailed description of the Ecotracer module and analyze the performance on two problems of differing complexity. Ecotracer was modified from previous versions to more accurately model contaminant excretion, and new numerical integration algorithms were implemented to increase accuracy and robustness...
November 13, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29145002/different-transport-behaviors-of-bacillus-subtilis-cells-and-spores-in-saturated-porous-media-implications-for-contamination-risks-associated-with-bacterial-sporulation-in-aquifer
#17
Qi Li, Jiakuan Yang, Wei Fan, Dandan Zhou, Xiaoyu Wang, Leilei Zhang, Mingxin Huo, John C Crittenden
In this study, we compared the transport characteristics of Bacillus subtilis cells and their spores in saturated porous media. Both the bacteria cells and spores were readily transported under lower ionic strengths (IS) (1mM), featuring high mass recovery rates (>75%). The bacteria cells recovery rate declined to 58.05% when the IS increased to 100mM; but the spores recovery rate remained at 74.54%. Spores appear to be more mobile than bacterial cells over wide range of IS. Surface properties and breakthrough curves analysis of the two bio-particles (cells and spores) indicated that attachment, straining and blocking mechanisms contribute differently to deposition processes...
November 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29144431/bioabsorption-and-bioaccumulation-of-cadmium-in-the-straw-and-grain-of-maize-zea-mays-l-in-growing-soils-contaminated-with-cadmium-in-different-environment
#18
Jorge Retamal-Salgado, Juan Hirzel, Ingrid Walter, Iván Matus
There is a worldwide increase of heavy metal or potentially toxic element (PTE), contamination in agricultural soils caused mainly by human and industrial action, which leads to food contamination in crops such as in maize. Cadmium (Cd) is a PTE often found in soils and it is ingested through food. It is necessary to determine the bioabsorption, distribution, and accumulation levels in maize to reduce or prevent food chain contamination. Cadmium absorption and accumulation in three maize cultivars were evaluated in three agricultural environments in Chile by increasing CdCl₂ rates (0, 1, and 2 mg·kg(-1))...
November 16, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29144406/evaluating-differences-in-aluminum-exposure-through-parenteral-nutrition-in-neonatal-morbidities
#19
Megan Fortenberry, Lela Hernandez, Jacob Morton
Aluminum is a common contaminant in many components of parenteral nutrition, especially calcium and phosphate additives. Although long-term effects have been described in the literature, short-term effects are not well-known. Currently, the Food and Drug Administration recommends maintaining aluminum at <5 mcg/kg/day. This was a single center, retrospective case-control study of 102 neonatal intensive care unit patients. Patients were included if they had a diagnosis of necrotizing enterocolitis, rickets/osteopenia, or seizures and received at least 14 days of parenteral nutrition...
November 16, 2017: Nutrients
https://www.readbyqxmd.com/read/29144301/contamination-levels-and-potential-sources-of-organic-pollution-in-an-asian-river
#20
Chitsan Lin, Kim Anh Nguyen, Chi Thanh Vu, Delia Senoro, Maria Ching Villanueva
The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds (SVOCs) for a period of 16 months (Feb 2014-June 2015). Our analyses show that elevated levels of VOCs were observed near two industrial areas, Dashe and Renwu industrial parks...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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