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821.
822.
Fate Modelling of DEHP in Roskilde Fjord, Denmark 总被引:1,自引:0,他引:1
Patrik Fauser Jørgen Vikelsøe Peter B. Sørensen Lars Carlsen 《Environmental Modeling and Assessment》2009,14(2):209-220
The fate of di(2-ethylhexyl)phthalate (DEHP) is modeled in Roskilde fjord, Denmark. The fjord is situated near Roskilde, which
comprises 80,000 PE, various industries, a central wastewater treatment plant, and adjacent agricultural fields. Roskilde
fjord is thus a suitable recipient for studying the transport and fate of DEHP, which is used in a variety of different industries
and consumer products. Wastewater from households and industries is led to the local wastewater treatment plant, which leads
the effluent to the fjord. The sludge is partly stored and partly amended on an adjacent field. The model applied in the present
study is a simple box model coupling water and sediment compartments of the fjord with wastewater treatment plant effluent,
streams leading to the fjord, and atmospheric deposition. The fjord model comprises first-order degradation, adsorption, sedimentation,
vertical diffusion in the sediment, dispersive mixing in the water, and water exchange with the surrounding sea. Experimental
measurements of DEHP were made in the fjord water and sediment, in the wastewater treatment plant inlet and effluent, and
in streams and atmospheric deposition. The experimental data are used to calibrate the model. The model results show that
freshwater from streams is the predominant DEHP source to the fjord, followed by atmospheric deposition and effluents from
wastewater treatment plants. Sedimentation is the predominant removal mechanism followed by water exchange with the sea and
degradation. 相似文献
823.
Dolores Gutiérrez-Cacciabue Ingrid Teich Hugo Ramiro Poma Mercedes Cecilia Cruz Mónica Balzarini Verónica Beatriz Rajal 《Environmental monitoring and assessment》2014,186(12):8359-8380
Several recreational surface waters in Salta, Argentina, were selected to assess their quality. Seventy percent of the measurements exceeded at least one of the limits established by international legislation becoming unsuitable for their use. To interpret results of complex data, multivariate techniques were applied. Arenales River, due to the variability observed in the data, was divided in two: upstream and downstream representing low and high pollution sites, respectively, and cluster analysis supported that differentiation. Arenales River downstream and Campo Alegre Reservoir were the most different environments, and Vaqueros and La Caldera rivers were the most similar. Canonical correlation analysis allowed exploration of correlations between physicochemical and microbiological variables except in both parts of Arenales River, and principal component analysis allowed finding relationships among the nine measured variables in all aquatic environments. Variable’s loadings showed that Arenales River downstream was impacted by industrial and domestic activities, Arenales River upstream was affected by agricultural activities, Campo Alegre Reservoir was disturbed by anthropogenic and ecological effects, and La Caldera and Vaqueros rivers were influenced by recreational activities. Discriminant analysis allowed identification of subgroup of variables responsible for seasonal and spatial variations. Enterococcus, dissolved oxygen, conductivity, E. coli, pH, and fecal coliforms are sufficient to spatially describe the quality of the aquatic environments. Regarding seasonal variations, dissolved oxygen, conductivity, fecal coliforms, and pH can be used to describe water quality during dry season, while dissolved oxygen, conductivity, total coliforms, E. coli, and Enterococcus during wet season. Thus, the use of multivariate techniques allowed optimizing monitoring tasks and minimizing costs involved. 相似文献
824.
Ehrich Dorothée Schmidt Niels M. Gauthier Gilles Alisauskas Ray Angerbjörn Anders Clark Karin Ecke Frauke Eide Nina E. Framstad Erik Frandsen Jay Franke Alastair Gilg Olivier Giroux Marie-Andrée Henttonen Heikki Hörnfeldt Birger Ims Rolf A. Kataev Gennadiy D. Kharitonov Sergey P. Killengreen Siw T. Krebs Charles J. Lanctot Richard B. Lecomte Nicolas Menyushina Irina E. Morris Douglas W. Morrisson Guy Oksanen Lauri Oksanen Tarja Olofsson Johan Pokrovsky Ivan G. Popov Igor Yu. Reid Donald Roth James D. Saalfeld Sarah T. Samelius Gustaf Sittler Benoit Sleptsov Sergey M. Smith Paul A. Sokolov Aleksandr A. Sokolova Natalya A. Soloviev Mikhail Y. Solovyeva Diana V. 《Ambio》2020,49(3):801-804
Ambio - In the original published article, some of the symbols in figure 1A were modified incorrectly during the typesetting and publication process. The correct version of the figure is provided... 相似文献
825.
Lázaro G. Cuinica Ilda Abreu Joaquim C. G. Esteves da Silva 《Environmental science and pollution research international》2014,21(3):2256-2262
Ostrya spp. and Carpinus spp. pollen was in vitro exposed to three atmospheric pollutants: CO, O3 and SO2. Two levels of each pollutant were used, and the first level corresponds to a concentration about the atmospheric hour-limit value acceptable for human health protection in Europe and the second level to about the triple of the first level. Experiments were done under artificial solar light with temperature and relative humidity controlled. The viability of the exposed pollen samples showed a significant decrease. Also, the germination percentage showed a significant decrease in both exposed pollens, and the effect was most pronounced for SO2, followed by O3 and CO. A general decreasing trend in the total soluble protein content of the exposed pollen samples when compared with the control was observed, but it was only statistically significant for the Ostrya spp pollen. The results showed marked effects were observed on the Ostrya spp. and Carpinus spp. pollen when exposed to air pollutant levels that can be considered safe for human health protection. 相似文献
826.
Rodrigo Pereira Cavalcante Lucas da Rocha Sandim Danielle Bogo Antônio Marcos Jacques Barbosa Marly Eiko Osugi Matildes Blanco Silvio Cesar de Oliveira Maria de Fatima Cepa Matos Amilcar Machulek Jr Valdir Souza Ferreira 《Environmental science and pollution research international》2013,20(4):2352-2361
In the present study, selected advanced oxidation processes (AOPs)—namely, photo-Fenton (with Fe2+, Fe3+, and potassium ferrioxalate—FeOx—as iron sources), solar photo-Fenton, Fenton, and UV/H2O2—were investigated for degradation of the antineoplastic drug mitoxantrone (MTX), frequently used to treat metastatic breast cancer, skin cancer, and acute leukemia. The results showed that photo-Fenton processes employing Fe(III) and FeOx and the UV/H2O2 process were most efficient for mineralizing MTX, with 77, 82, and 90 % of total organic carbon removal, respectively. MTX probably forms a complex with Fe(III), as demonstrated by voltammetric and spectrophotometric measurements. Spectrophotometric titrations suggested that the complex has a 2:1 Fe3+:MTX stoichiometric ratio and a complexation constant (K) of 1.47 × 104 M–1, indicating high MTX affinity for Fe3+. Complexation partially inhibits the involvement of iron ions and hence the degradation of MTX during photo-Fenton. The UV/H2O2 process is usually slower than the photo-Fenton process, but, in this study, the UV/H2O2 process proved to be more efficient due to complexing of MTX with Fe(III). The drug exhibited no cytotoxicity against NIH/3T3 mouse embryonic fibroblast cells when oxidized by UV/H2O2 or by UV/H2O2/FeOx at the concentrations tested. 相似文献
827.
Carolinne Borges Khayat Emília Oliveira Alves Costa Macks Wendhell Gonçalves Damiana Mirian da Cruz e Cunha Alex Silva da Cruz Caroline Oliveira de Araújo Melo Rogério Pereira Bastos Aparecido Divino da Cruz Daniela de Melo e Silva 《Environmental science and pollution research international》2013,20(10):7334-7340
We evaluated 41 rural workers occupationally exposed to pesticides and 32 subjects as a control group, using the micronucleus (MN) and the comet assay. For the comet assay, we evaluated the peripheral blood, and for the MN, we sampled cells from the oral epithelium. Damage to DNA was measured by tail length, % DNA in tail (% tail), olive tail moment (OTM), and tail moment (TM). The exposed group presented an 8× increase in MN frequency, when compared to the control group (p <0.05). When we contrasted the MN frequencies between the individuals that use and do not use personal protective equipment, we found a mean of 7.5 MN (57 % variance) and 12.1 MN (130 % variance), respectively. The binucleated cells were 0.04 and 0.005, in the exposed and control groups, respectively, indicating 8× increase in the number of binucleated cells, when comparing the groups (p <0.05). In the comet assay, we demonstrated statistically significant differences in three parameters (% DNA, OTM, and TM) indicating that the rural workers presented high levels of genomic damages. Our results indicate that occupational exposure to pesticides could cause genome damage in somatic cells, representing a potential health risk to Brazilian rural workers that deal constantly with agrochemicals without adequate personal protection equipment. 相似文献
828.
Lígia M. Salvo Maria Ivette C. Malucelli José Roberto M. C. da Silva Geraldo C. Alberton Helena C. Silva De Assis 《Journal of environmental science and health. Part. B》2013,48(7):449-455
In this study, we used primary cultures of fish hepatic cells as a tool for evaluating the effects of environmental contamination. Primary hepatic cell cultures derived from the subtropical fish Metynnis roosevelti were exposed to different concentrations (0.275, 2.75 and 27.5 μg L?1) of the herbicides 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-chloro-2-methylphenoxyacetic acid (MCPA). Cellular respiratory activity was evaluated by polarography using three substrates: 0.5 M glucose, 0.5 M succinate and 0.5 M α-ketoglutarate. Significant changes were observed in cellular oxygen consumption with 0.5 M α-ketoglutarate. Even at low concentrations, 2,4-D and MCPA were potent uncouplers of oxidative phosphorylation. Primary cultures of M. roosevelti liver cells may provide a useful tool for the evaluation of environmental contaminant effects. A review of regulations regarding permitted concentrations of these herbicides is needed. 相似文献
829.
Drawing on the cognitive persistence perspective of creativity and conservation of resources theory, we investigated how 2 social contexts (perceived relationship conflict and coworker support for creativity) influence the relationship between anger and creative process engagement (CPE) in organizations. We tested our hypotheses using 422 daily surveys from 98 participants, collected over 5 consecutive workdays. The results show that anger perceived relationship conflict and coworker support for creativity interact to influence CPE. Specifically, when relationship conflict is high, the anger–CPE relationship is positive for employees who receive high coworker support for creativity, but negative for those who receive low coworker support for creativity. In contrast, when relationship conflict is low, the anger–CPE relationship is positive but does not differ at high versus low coworker support for creativity. 相似文献
830.
Chemical Characterization of Soil Used as a Deposit for Waste Originating From the Manufacturing of Products Based on Fiberglass
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Genesio Mario da Rosa Arci Dirceu Wastowski Angela Maria Mendonça Márcia Gabriel Renato Beppler Sphor 《环境质量管理》2017,26(3):125-135
Companies need to follow environmental laws as they affect their manufacturing systems, waste handling, and the management of soil on their properties to ensure that their properties are either improved or altered as little as possible. Thus, the objective of this study was to evaluate the use of energy dispersive X‐ray fluorescence spectrometry (EDXRF) to determine the concentrations of elements present in the soil at a manufacturer of products based on fiberglass where wastes from production activities have been deposited on the property. 相似文献