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51.
Singlet molecular oxygen—mediated photooxidation of monochloro and mononitrophenols. A kinetic study
A kinetic and mechanistic study on the aerobic dye sensitized photooxidation of the mono—nitro and chlorophenols was carried out. A singlet molecular oxygen mechanism operates in the photooxidation. Solvent and substituent effects, suggest the intermediacy of a complex with partial charge transfer character, as has been postulated for other phenols. Chemical (reactive) and physical interactions of the substrates with singlet molecular oxygen were discriminated. Quantum yields for photooxidation (higher for the chlorophenols) range from 3 × 10‐2 to 2 × 10‐3, as measured by substrate or oxygen consumption. These values indicate the viability of a singlet molecular oxygen photooxidation as a way for the degradation of nitro and chlorophenol environmental contaminants. 相似文献
52.
Arsenic bioaccessibility in a gold mining area: a health risk assessment for children 总被引:1,自引:0,他引:1
Ono FB Guilherme LR Penido ES Carvalho GS Hale B Toujaguez R Bundschuh J 《Environmental geochemistry and health》2012,34(4):457-465
High concentrations of total arsenic (As) have been measured in soils of gold mining areas of Brazil. However, bioaccessibility tests have not yet been conducted on those materials, which is essential for better health risk estimates. This study aimed at?evaluating As bioaccessibility in samples from a gold mining area located in Brazil and assessing children's exposure to As-contaminated materials. Samples were collected from different materials (a control and four As-contaminated soils/sediments) found in a gold mine area located in Paracatu (MG), Brazil. Total and bioaccessible As concentrations were determined for all samples. The control soil presented the lowest As concentrations, while all other materials contained high total As concentrations (up to 2,666?mg?kg(-1)) and low bioaccessible As percentage (<4.2%), indicating a low risk from exposure of resident children next to this area. The calculated dose of exposure indicated that, except for the pond tailings, in all other areas, the exposure route considering soil ingestion contributed at most to 9.7% of the maximum As allowed ingestion per day (0.3?μg?kg(-1) BW day(-1)). 相似文献
53.
Alexandre?C.?L.?Almeida Luiz?H.?Duczmal André?L.?F.?Can?adoEmail author Fabio?R.?da?Silva 《Environmental and Ecological Statistics》2018,25(2):257-275
Multiple data sources are essential to provide reliable information regarding the emergence of potential health threats, compared to single source methods. Spatial Scan Statistics have been adapted to analyze multivariate data sources, but only ad hoc procedures have been devised to address the problem of selecting the most likely cluster and computing its significance. In this work, information from multiple data sources of disease surveillance is incorporated to achieve more coherent spatial cluster detection using tools from multi-criteria analysis. The best cluster solutions are found by maximizing two objective functions simultaneously, based on the concept of dominance. To evaluate the statistical significance of solutions, a statistical approach based on the concept of attainment function is used. The multi-criteria approach has several advantages: the representation of the evaluation function for each data source is clear, and does not suffer from an artificial, and possibly confusing mixture with the other data source evaluations; it is possible to attribute, in a rigorous way, the statistical significance of each candidate cluster; and it is possible to analyze and pick-up the best cluster solutions, as given naturally by the non-dominated set. The methodology is illustrated with real datasets. 相似文献
54.
55.
Shana Sampaio Sieber Patrícia Muniz Medeiros Ulysses Paulino Albuquerque 《Journal of Agricultural and Environmental Ethics》2011,24(5):511-531
The diversity of plant resources in the Brazilian semi-arid region is being compromised by practices related to agriculture,
pastures, and forest harvesting, especially in areas containing Caatinga vegetation (xeric shrublands and thorn forests).
The impact of these practices constitutes a series of complex factors involving local issues, creating a need for further
scientific studies on the social-environmental dynamics of natural resource use. Through participatory methods, the present
study analyzed people’s representations about local environmental change processes in the Brazilian semi-arid region, taking
into consideration local production systems, natural resources, and their importance. Environmental historical graphs were
developed with nine local families to analyze landscape changes with regard to cultivated areas and pastures, and their relationship
with the availability of native vegetation. Punctuation exercises were performed to observe the importance of each unit that
supplied native and cultivated resources. The availability of native resources in the environment is subject to stability,
as observed by a majority of the local families. The role of the production units (crops and pastures) was emphasized by most
families in the study, especially because of the need for products for subsistence needs and income generation. The current
decline of such practices is a consequence of an exodus of field workers and also relates to the conservation of native species
that otherwise would have been deforested in favor of agricultural practices. 相似文献
56.
Schirmer Waldir Nagel Stroparo Erivelton César Gueri Matheus Vitor Diniz Capanema Marlon André Mazur Douglas Luiz Jucá José Fernando Thomé Martins Kelly Geronazzo 《Journal of Material Cycles and Waste Management》2022,24(5):2041-2053
Journal of Material Cycles and Waste Management - Biofilters have been recognized as a key technology in the mitigation of greenhouse gases (GHG) emitted by landfills. This study aimed to evaluate... 相似文献
57.
Schumacher Aécio G. Gomes Guilherme J. C. Schneider Denise S. G. Pires Patrício J. M. Gomes Ruan G. S. 《Journal of Material Cycles and Waste Management》2022,24(6):2555-2568
Journal of Material Cycles and Waste Management - The use of industrial byproducts as replacement of natural aggregates has been extensively investigated to design eco-friendly roads. One of the... 相似文献
58.
Martins Bruna Alves de Albuquerque Priscilla Barbosa Sales de Souza Marthyna Pessoa 《Journal of Polymers and the Environment》2022,30(10):4023-4039
Journal of Polymers and the Environment - Polymers used as raw materials for synthetic packaging, i.e., those obtained from petroleum-derived sources, are resistant to degradation. Because of this,... 相似文献
59.
Soares Jéssica Maria Alexandre da Silva Júnior Elenildo Dário Oliveira de Veras Bruno Yara Ricardo de Albuquerque Priscilla Barbosa Sales de Souza Marthyna Pessoa 《Journal of Polymers and the Environment》2022,30(1):217-231
Journal of Polymers and the Environment - Bioactive biodegradable films are emerging biomaterials in the food packaging field. This study aims to investigate the effect of different Cenostigma... 相似文献
60.
Leite Luan de Souza Ogura Allan Pretti dos Santos Danilo Vitorino Espíndola Evaldo Luiz Gaeta Daniel Luiz Antonio 《Environmental science and pollution research international》2022,29(24):35800-35810
Environmental Science and Pollution Research - Algal organic matter (AOM) in water reservoirs is a worldwide concern for drinking water treatment; once it is one of the main precursors for... 相似文献