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Science of the Total Environment

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https://www.readbyqxmd.com/read/28822339/effects-of-simulated-n-deposition-on-foliar-nutrient-status-n-metabolism-and-photosynthetic-capacity-of-three-dominant-understory-plant-species-in-a-mature-tropical-forest
#1
Qinggong Mao, Xiankai Lu, Hui Mo, Per Gundersen, Jiangming Mo
Anthropogenic increase of nitrogen (N) deposition has threatened forest ecosystem health at both regional and global scales. In N-limited ecosystems, atmospheric N input is regarded as an important nutrient source for plant growth. However, it remains an open question on how elevated N deposition affects plant growth in N-rich forest ecosystems. To address this question, we used a simulated N deposition experiment in an N-rich mature tropical forest of southern China, with N addition levels as 0kgNha(-1)yr(-1) (Control), 50kgNha(-1)yr(-1) (Low-N), 100kgNha(-1)yr(-1) (Middle-N) and 150kgNha(-1)yr(-1) (High-N), respectively...
August 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822338/in-vitro-bioaccessibility-and-health-risk-assessment-of-heavy-metals-in-atmospheric-particulate-matters-from-three-different-functional-areas-of-shanghai-china
#2
Huang Huang, Ying Jiang, Xiaoyun Xu, Xinde Cao
The bioaccessibility and human health risks of heavy metals in PM2.5 and PM10 samples from three functional areas of Shanghai, China including a commercial area (CA), a residential area (RA), and an industrial area (IA), were investigated. Gamble's solution and physiologically based extraction test were employed to simulate human respiratory and digestive system, respectively. Both PM2.5 and PM10 concentration in the three areas exceeded the guideline of WHO, and followed the order of IA>CA≈RA. Zinc and Pb were the most abundant metals with a concentration range of 0...
August 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822337/photocatalysis-of-estrone-in-water-and-wastewater-comparison-between-au-tio2-nanocomposite-and-tio2-and-degradation-by-products
#3
Kireesan Sornalingam, Andrew McDonagh, John L Zhou, Md Abu Hasan Johir, Mohammad Boshir Ahmed
Gold-modified TiO2 (Au-TiO2) photocatalysts were utilised for the degradation of estrone (E1), a major endocrine disrupting chemical in water and wastewater. Au-TiO2 catalysts were synthesised by a deposition-precipitation method with gold loadings of 0-8% (wt%). The Au-TiO2 nanocomposite exhibited superior activity compared to P25 TiO2 under UVA (λ=365nm), cool white (λ>420nm) and green (λ=523nm) light emitting diodes (LEDs), for treating 1mgl(-1) of E1. The 4wt% Au loading was found to produce the best photocatalytic activity with a rate constant of 2...
August 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822336/cesium-sorption-reversibility-and-kinetics-on-illite-montmorillonite-and-kaolinite
#4
Chad B Durrant, James D Begg, Annie B Kersting, Mavrik Zavarin
Understanding sorption and desorption processes is essential to predicting the mobility of radionuclides in the environment. We investigate adsorption/desorption of cesium in both binary (Cs+one mineral) and ternary (Cs+two minerals) experiments to study component additivity and sorption reversibility over long time periods (500days). Binary Cs sorption experiments were performed with illite, montmorillonite, and kaolinite in a 5mM NaCl/0.7mM NaHCO3 solution (pH8) and Cs concentration range of 10(-3) to 10(-11)M...
August 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28820980/isotope-fractionation-in-phase-transfer-processes-under-thermodynamic-and-kinetic-control-implications-for-diffusive-fractionation-in-aqueous-solution
#5
Frank-Dieter Kopinke, Anett Georgi, Ulf Roland
Diffusive isotope fractionation of organic compounds in aqueous solution was investigated by means of liquid-liquid and liquid-gas partitioning experiments under kinetic control. The two-film model was used to describe phase-transfer kinetics. It assumes the diffusion of solutes across a stagnant water boundary layer as the rate-controlling step. For all investigated solutes (benzene-D0 and -D6, toluene-D0, -D5, and -D8, cyclohexane-D0 and -D12), there was no significant observable fractionation effect between nondeuterated and perdeuterated isotopologues, resulting in a ratio of diffusion coefficients Dlight: Dheavy=1...
August 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28820979/data-driven-analysis-of-nutrient-inputs-and-transfers-through-nested-catchments
#6
Lea Levi, Vladimir Cvetkovic, Georgia Destouni
A data-driven screening methodology is developed for estimating nutrient input and retention-delivery in catchments with measured water discharges and nutrient concentrations along the river network. The methodology is applied to the Sava River Catchment (SRC), a major transboundary catchment in southeast Europe, with seven monitoring stations along the main river, defining seven nested catchments and seven incremental subcatchments that are analysed and compared in this study. For the relatively large nested catchments (>40,000km(2)), characteristic regional values emerge for nutrient input per unit area of around 30T/yr/km(2) for dissolved inorganic nitrogen (DIN) and 2T/yr/km(2) for total phosphorus (TP)...
August 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28820978/concentration-addition-and-independent-action-model-which-is-better-in-predicting-the-toxicity-for-metal-mixtures-on-zebrafish-larvae
#7
Yongfei Gao, Jianfeng Feng, Lili Kang, Xin Xu, Lin Zhu
The joint toxicity of chemical mixtures has emerged as a popular topic, particularly on the additive and potential synergistic actions of environmental mixtures. We investigated the 24h toxicity of Cu-Zn, Cu-Cd, and Cu-Pb and 96h toxicity of Cd-Pb binary mixtures on the survival of zebrafish larvae. Joint toxicity was predicted and compared using the concentration addition (CA) and independent action (IA) models with different assumptions in the toxic action mode in toxicodynamic processes through single and binary metal mixture tests...
August 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28818662/organic-matter-quality-structures-benthic-fatty-acid-patterns-and-the-abundance-of-fungi-and-bacteria-in-temperate-lakes
#8
Robert Taube, Lars Ganzert, Hans-Peter Grossart, Gerd Gleixner, Katrin Premke
Benthic microbial communities (BMCs) play important roles in the carbon cycle of lakes, and benthic littoral zones in particular have been previously highlighted as biogeochemical hotspots. Dissolved organic matter (DOM) presents the major carbon pool in lakes, and although the effect of DOM composition on the pelagic microbial community composition is widely accepted, little is known about its effect on BMCs, particularly aquatic fungi. Therefore, we investigated the composition of benthic littoral microbial communities in twenty highly diverse lakes in northeast Germany...
August 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28818661/variation-in-organochlorine-and-mercury-levels-in-first-and-replacement-eggs-of-a-single-egg-clutch-breeder-the-thick-billed-murre-at-a-breeding-colony-in-the-canadian-arctic
#9
Birgit M Braune, Shoshanah R Jacobs, Anthony J Gaston
Contaminant concentrations may vary among sequentially-laid eggs in multi-egg clutches, and this variation has implications for the interpretation of contaminant concentrations in monitoring programs. The thick-billed murre (Uria lomvia) is a key species for monitoring contaminants in the Canadian Arctic and lays only a single egg per year. Therefore, the potential issue of intra-clutch variation in contaminant concentrations is avoided. However, if the egg is removed or lost early in the incubation stage, the adult female murre will relay...
August 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28818660/environmental-effects-are-stronger-than-human-effects-on-mammalian-predator-prey-relationships-in-arid-australian-ecosystems
#10
Benjamin L Allen, Alana Fawcett, Alison Anker, Richard M Engeman, Allan Lisle, Luke K-P Leung
Climate (drought, rainfall), geology (habitat availability), land use change (provision of artificial waterpoints, introduction of livestock), invasive species (competition, predation), and direct human intervention (lethal control of top-predators) have each been identified as processes driving the sustainability of threatened fauna populations. We used a systematic combination of empirical observational studies and experimental manipulations to comprehensively evaluate the effects of these process on a model endangered rodent, dusky hopping-mice (Notomys fuscus)...
August 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28818659/a-new-methodology-to-identify-surface-water-bodies-at-risk-by-using-pesticide-monitoring-data-the-glyphosate-case-study-in-lombardy-region-italy
#11
Andrea Di Guardo, Antonio Finizio
In the last decades, several monitoring programs were established as an effect of EU Directives addressing the quality of water resources (drinking water, groundwater and surface water). Plant Protection Products (PPPs) are an obvious target of monitoring activities, since they are directly released into the environment. One of the challenges in managing the risk of pesticides at the territorial scale is identifying the locations in water bodies needing implementation of risk mitigation measures. In this, the national pesticides monitoring plans could be very helpful...
August 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28810152/driving-forces-and-impacts-of-food-system-nitrogen-flows-in-china-1990-to-2012
#12
Bing Gao, Yunfeng Huang, Wei Huang, Yalan Shi, Xuemei Bai, Shenghui Cui
Food nitrogen (N), which includes animal-food (AN) and plant-food N (PN), has been driven by population growth (PG), dietary changes associated with income growth (DC) and rural-urban migration (M) over the past three decades, and these changes combined with their N cost, have caused some effect on N use in China's food system. Although there is an increasing literature on food N and its environmental impacts in China, the relative magnitude of these driving forces are not well understood. Here we first quantify the differences in per capita AN and PN consumption in urban and rural areas and their impacts on N input to the food system during 1990-2012, and then quantify the relative contributions of DC, PG and M in the overall N change during this period...
August 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28810151/-heavy-metal-what-to-do-now-to-use-or-not-to-use
#13
LETTER
Olivier Pourret, Jean-Claude Bollinger
No abstract text is available yet for this article.
August 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28810150/occurrence-of-carbazoles-in-dust-and-air-samples-from-different-locations-in-germany
#14
Hermann Fromme, Wenying Mi, Thomas Lahrz, Martin Kraft, Bettina Aschenbrenner, Bianca Bruessow, Ralf Ebinghaus, Zhiyong Xie, Ludwig Fembacher
9H-carbazole is generated from incomplete combustion of diverse fossil fuels and biomass, in tobacco smoke and from industrial processes, while halogenated carbazoles have natural and anthropogenic sources. We analyzed 9H-carbazole and 14 halogenated carbazoles in dust samples from 14 schools, 13 daycare centers, and 13 residences, as well as 5 indoor air samples from residences in Munich, Germany. Overall, we present first data of various carbazoles in different indoor environments without visible combustion sources...
August 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806556/persistent-organic-pollutants-in-fat-of-three-species-of-pacific-pelagic-longline-caught-sea-turtles-accumulation-in-relation-to-ingested-plastic-marine-debris
#15
Katharine E Clukey, Christopher A Lepczyk, George H Balazs, Thierry M Work, Qing X Li, Melannie J Bachman, Jennifer M Lynch
In addition to eating contaminated prey, sea turtles may be exposed to persistent organic pollutants (POPs) from ingesting plastic debris that has absorbed these chemicals. Given the limited knowledge about POPs in pelagic sea turtles and how plastic ingestion influences POP exposure, our objectives were to: 1) provide baseline contaminant levels of three species of pelagic Pacific sea turtles; and 2) assess trends of contaminant levels in relation to species, sex, length, body condition and capture location...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806555/environmental-and-socio-economic-sustainability-appraisal-of-contaminated-land-remediation-strategies-a-case-study-at-a-mega-site-in-china
#16
Yinan Song, Deyi Hou, Junli Zhang, David O'Connor, Guanghe Li, Qingbao Gu, Shupeng Li, Peng Liu
Green and sustainable remediation (GSR) has become a global trend in the contaminated land remediation field. Growing numbers of countries have adopted GSR procedures published in regulatory and/or technical guidance. China is fast becoming one of the largest remediation markets in the world, and is beginning to engage with GSR. Among other efforts, a taskforce is currently developing the first Chinese technical standard on GSR. This paper presents the context positioning and development of a sustainable remediation assessment indicator set for China...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806554/metal-bioaccumulation-and-biomarkers-of-effects-in-caged-mussels-exposed-in-the-athabasca-oil-sands-area
#17
M Pilote, C André, P Turcotte, F Gagné, C Gagnon
The Athabasca oil sands deposit is the world's largest known reservoir of crude bitumen and the third-largest proven crude oil reserve. Mining activity is known to release contaminants, including metals, and to potentially impact the aquatic environment. The purpose of this study was to determine the impacts of oil sands mining on water quality and metal bioaccumulation in mussels from the Fort McMurray area in northern Alberta, Canada. The study presents two consecutive years of contrasting mussel exposure conditions (low and high flows)...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806553/thiacloprid-adsorption-and-leaching-in-soil-effect-of-the-composition-of-irrigation-solutions
#18
José Antonio Rodríguez-Liébana, M Dolores Mingorance, Aránzazu Peña
Pressure on groundwater resources has increased during the last decades due to the growing demand, especially in arid and semiarid regions, such as the Mediterranean basin, with frequent drought periods. In order to partially remediate this environmental problem of world concern, irrigation of agricultural lands with adequately treated wastewaters (TWW) is becoming a common management practice. The complex composition of these low-quality waters may influence the behavior of organic contaminants in soils. A calcareous soil with low organic carbon content was selected for the assessment of the adsorption and leaching of the neonicotinoid insecticide thiacloprid (THC)...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806552/exposure-of-engineered-nanoparticles-to-alexandrium-tamarense-dinophyceae-healthy-impacts-of-nanoparticles-via-toxin-producing-dinoflagellate
#19
Manlu Li, Daoyi Chen, Yang Liu, Chia Ying Chuang, Fanzhou Kong, Paul J Harrison, Xiaoshan Zhu, Yuelu Jiang
Human activities can enhance the frequency, intensity and occurrence of harmful algal blooms (HABs). Engineered nanoparticles (ENPs), contained in many materials, will inevitably enter coastal waters and thus cause unpredictable impacts on aquatic organisms. However, knowledge of the influence of ENPs on HAB species is still lacking. In this study, we examined the effects of titanium dioxide nanoparticles (nTiO2), zinc oxide nanoparticles (nZnO) and aluminum oxide nanoparticles (nAl2O3) on physiological changes and paralytic shellfish poisoning toxins (PSTs) production of Alexandrium tamarense...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806551/effects-of-agricultural-land-use-on-fluvial-carbon-dioxide-methane-and-nitrous-oxide-concentrations-in-a-large-european-river-the-meuse-belgium
#20
A V Borges, F Darchambeau, T Lambert, S Bouillon, C Morana, S Brouyère, V Hakoun, A Jurado, H-C Tseng, J-P Descy, F A E Roland
We report a data-set of CO2, CH4, and N2O concentrations in the surface waters of the Meuse river network in Belgium, obtained during four surveys covering 50 stations (summer 2013 and late winter 2013, 2014 and 2015), from yearly cycles in four rivers of variable size and catchment land cover, and from 111 groundwater samples. Surface waters of the Meuse river network were over-saturated in CO2, CH4, N2O with respect to atmospheric equilibrium, acting as sources of these greenhouse gases to the atmosphere, although the dissolved gases also showed marked seasonal and spatial variations...
August 11, 2017: Science of the Total Environment
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