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排序方式: 共有151条查询结果,搜索用时 15 毫秒
31.
Fabio Gosetti Michela Bottaro Valentina Gianotti Eleonora Mazzucco Paolo Frascarolo Davide Zampieri Caterina Oliveri Aldo Viarengo Maria Carla Gennaro 《Environmental pollution (Barking, Essex : 1987)》2010,158(2):592-146
This paper studies the degradation reactions that 4-chloroaniline can naturally undergo in waters for the action of sun light. 10.00 mg L−1 4-chloroaniline aqueous solution, without any addition of organic solvent, are undergone to photoirradiation under conditions that simulate sun light. The degradation pathway, followed by HPLC-DAD-MS/MS methods, is complex since the pollutant gives rise to many photoproducts: the predominant species are characterized by m/z values of 217 (P5) and 218 (P6) and are compatible with dimeric structures of 4-chloroaniline. Vibrio fischeri tests indicate that the photoproducts of 4-chloroaniline are characterized by a toxicity level significantly greater than the precursor. 相似文献
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Collivignarelli C Tharnpoopasiam P Vaccari M De Felice V Di Bella V Worakhunpiset S 《Environmental monitoring and assessment》2008,142(1-3):345-358
After 2004 Indian Ocean Tsunami, which hit and devastated several Countries in Southeast Asia, University of Brescia and Mahidol University started a project on water monitoring and treatment for drinking purposes in Takua Pa district (Thailand), the most damaged by the tsunami. In particular, this paper presents the results of a study conducted to evaluate the effectiveness of Takua Pa drinking water treatment plant and to identify actions that could be adopted to improve its performances. The results show that, even if the effluent usually meets Thai guide values, except for pH which is already too acid in the influent, the plant needs several structural and managerial improvements, such as filtration and sedimentation upgrade, coagulation/flocculation and final disinfection re-organization, use of proper registers to better plan and control employees activities. Moreover, it was determined that water quality in the distribution network is characterized by turbidity and organic matter values higher than those evaluated in the plant effluent. 相似文献
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The present paper proposes a spatial multicriteria approach for supporting decision makers in the siting process of a waste incinerator plant in the Province of Torino (Italy). Municipal solid waste management is an intrinsically complex problem because it involves different interconnected elements and must achieve objectives that are often in conflict. Given the spatial nature of the problem, a useful support is provided by a family of methods that are rapidly gaining traction for planning and policy-making, named multicriteria spatial decision support systems, which are based on geographical information systems and multicriteria analysis coupling. In the present study, a methodological framework is proposed for the integration of geographical information systems with a specific multicriteria analysis technique, named Analytic Network Process. The method is illustrated with reference to a case study in the Province of Torino. The purpose of the research is to generate a suitability map of the area under analysis in order to locate a municipal solid waste incinerator plant. The application allows the dependence relationships between the criteria to be assessed and the relative importance of all the elements to be evaluated. The results are obtained in the form of maps analyzed through the ILWIS 3.3 GIS software and have been further verified through a “what-if” analysis with reference to the clusters priorities in order to test the robustness of the model. The implementation of the spatial Analytic Network Process technique gives an originality value to the present research since it represents one of the first applications at both the national and international levels. 相似文献
37.
Catarina Mansilha Poliana Silva Sónia Rocha Paula Gameiro Valentina Domingues Carina Pinho Isabel M. P. L. V. O. Ferreira 《Environmental science and pollution research international》2013,20(9):6007-6018
Bisphenol A (BPA) is an endocrine disrupting chemical (EDC) whose migration from food packaging is recognized worldwide. However, the real overall food contamination and related consequences are yet largely unknown. Among humans, children’s exposure to BPA has been emphasized because of the immaturity of their biological systems. The main aim of this study was to assess the reproductive impact of BPA leached from commercially available plastic containers used or related to child nutrition, performing ecotoxicological tests using the biomonitoring species Daphnia magna. Acute and chronic tests, as well as single and multigenerational tests were done. Migration of BPA from several baby bottles and other plastic containers evaluated by GC-MS indicated that a broader range of foodstuff may be contaminated when packed in plastics. Ecotoxicological test results performed using defined concentrations of BPA were in agreement with literature, although a precocious maturity of daphnids was detected at 3.0 mg/L. Curiously, an increased reproductive output (neonates per female) was observed when daphnids were bred in the polycarbonate (PC) containers (145.1?±?4.3 % to 264.7?±?3.8 %), both in single as in multigenerational tests, in comparison with the negative control group (100.3?±?1.6 %). A strong correlated dose-dependent ecotoxicological effect was observed, providing evidence that BPA leached from plastic food packaging materials act as functional estrogen in vivo at very low concentrations. In contrast, neonate production by daphnids cultured in polypropylene and non-PC bottles was slightly but not significantly enhanced (92.5?±?2.0 % to 118.8?±?1.8 %). Multigenerational tests also revealed magnification of the adverse effects, not only on fecundity but also on mortality, which represents a worrying trend for organisms that are chronically exposed to xenoestrogens for many generations. Two plausible explanations for the observed results could be given: a non-monotonic dose–response relationship or a mixture toxicity effect. 相似文献
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Paolo Rosato Anna Alberini Valentina Zanatta Margaretha Breil 《Journal of Environmental Planning and Management》2010,53(2):257-281
Are economic incentives and regulatory relief useful tools for encouraging reuse of abandoned or under-utilised urban sites with historic buildings? Answering this question is of key importance for many European cities and for older US cities, and has important implications in terms of urban sustainability and “smart growth” initiatives. This study uses conjoint choice experiments to explore the relative importance of economic incentives, regulatory relief, land use and property regime offerings at under-utilised historic sites in Venice, Italy. Real estate developers and investors were surveyed, and asked to choose between pairs of hypothetical projects in three Venice locations, as well as between one of these projects and the alternative to do a development project elsewhere. Statistical models of the responses to these choice questions indicate that respondents were sensitive to the price of acquiring the land (and hence to any policies that influence prices), and particularly sensitive to the property regime that would be granted to developers and investors and to the allowable land use. It is concluded that the city should focus on offering land uses and property regimes that are more in tune with developer demand. 相似文献
39.
Escalada JP Pajares A Gianotti J Massad WA Bertolotti S Amat-Guerri F García NA 《Chemosphere》2006,65(2):237-244
The present work studies the visible-light-promoted photodegradation of the colorless fungicide carbendazim (methyl 2-benzimidazolecarbamate) and several 2-substituted benzimidazoles (SBZ's), in water or water-methanol solution, in the presence of air and, as a photosensitizer, the synthetic xanthene dye Rose Bengal (RB) or the natural pigment riboflavin (Rf). The results indicate that the degradation of each particular SBZ depends on its chemical structure and on the sensitizer employed. In the presence of RB, the degradation always operates via a singlet molecular oxygen (O(2)((1)Delta(g)))-mediated mechanism, through a highly efficient process, as deduced from the comparison of the rate constants for physical and chemical quenching of O(2)((1)Delta(g)). In the presence of Rf, the visible-light irradiation of any of the studied SBZ's produces a series of competitive processes that depend on the relative concentrations of Rf and SBZ. These processes include the quenching of excited singlet and triplet Rf states by the SBZ and the generation of both O(2)((1)Delta(g)) and superoxide radical anion (O(2)(-)), the latter generated by electron transfer from excited Rf species to the dissolved oxygen. The overall result is the photodegradation of the SBZ and the photoprotection of the sensitizer. 相似文献
40.
Polati S Angioi S Gianotti V Gosetti F Gennaro MC 《Journal of environmental science and health. Part. B》2006,41(4):333-344
Pesticides and other organic species are adsorbed by soil via different mechanisms, with bond strengths that depend on the properties of both the soil and the pesticide. Since the clay fraction in soil is a preferential sorbent for organic matter, reference kaolinite and montmorillonite are useful models for studying the mechanism and the strength of sorption. This paper presents the results of batch experiments to investigate the interactions of kaolinite KGa-1 and montmorillonite SWy-1 with the following pesticides and organic species resulting from the natural degradation of pesticides in the environment: atrazine (1-chloro-3-ethylamino-5-isopropylamino-2,4,6-triazine), simazine (1-chloro-3,5-bisethylamino-2,4,6-triazine), diuron [1,1-dimethyl-3-(3,4-dichlorophenyl)urea], aniline, 4-chlorophenol, 2,4-dichlorophenol, and 2,4,6-trichlorophenol. Each of these chemicals has different hydrophilicity. Systems containing 2.0 g of clay were put in contact with 100.0 mL of solutions of the pesticides at known concentration ranging from 1.0 to 5.0 mg/L, and the amount of solute adsorbed was evaluated through RP-HPLC analysis of the pesticide still present in the aqueous suspension. To test for electrostatic interactions between the clay surface and the pesticides, potentiometric titration was used to determine the permanent surface charge of clays. Experiments were performed at different pH values. The results indicate that, for the chemicals studied, neutral molecules are preferentially retained relative to ionized ones, and that montmorillonite is a more effective sorbent than kaolinite. 相似文献