Anthropogenic Contamination
Mostrando 25-36 de 39 artigos, teses e dissertações.
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25. Geoprocessamento como ferramenta de apoio à gestão dos recursos hídricos subterrâneos do Distrito Federal
In the Federal District of Brasilia (Capital of Brazil), the groundwater demand has growin significantly in the last decades. Migratory process promoted by local government policies, population increasing and inadequate territory occupation are the main factors that compromises qualitatively and quantitatively subsurface water resources. In this sense, it is
Publicado em: 2007
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26. Contribution of the acid volatile sulfide in the control of metal bioavailability in sediments of the Morrão river, estuary system of Santos-Cubatão (SP) / Contribuição dos sulfetos volatilizados por acidificação no controle da biodisponibilidade de metais em sedimentos do rio Morrão, sistema estuarino de Santos-Cubatão (SP)
Estuaries, in general, reducer environments in which anthropogenic activities could result in high metal levels in the sediments. Sulfides are important phases in the control of the concentration of some free metals in those sediments. The majority of sulfides in sediments occurs as iron bisulfides and iron monosulfide, being the last the most reactive. Due
Publicado em: 2007
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27. DiagnÃstico da evoluÃÃo de algumas espÃcies quÃmicas e matÃria orgÃnica, em perfil sedimentar holocÃnico no estuÃrio do rio Manguaba, Estado de Alagoas
A Ãrea estuarina do rio Manguaba, situada no litoral norte do Estado de Alagoas, Nordeste do Brasil, Ã dominada por cultivos de cana-de-aÃÃcar, e apresenta baixos Ãndices de industrializaÃÃo e densidade demogrÃfica. Ambientes desse tipo oferecem grande diversidade para colonizaÃÃo, refÃgio e criadouro de espÃcies economicamente importantes, mas v
Publicado em: 2007
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28. Water quality assessement and water conditions for recreational use in basin of the Carrancas River - MG / AvaliaÃÃo da qualidade das Ãguas e condiÃÃes de balneabilidade na bacia do RibeirÃo de Carrancas-MG
The development of anthropogenic activities without an adequate planning has provided the degradation of waters quality, compromising the several uses of this natural resource, as its utilization for recreational use. In this context, the county of Carrancas, located in the southern area of Minas Gerais state, possesses various natural attractions, such as s
Publicado em: 2007
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29. Avaliação de impactos ambientais nos tributários do lago Paranoá, Brasília - DF
The high level of urbanization in Distrito Federal in Brazil is contributing to modify the environment particularly the quality of surface water resources. The historical of environment aggression to the Paranoá Lake through urban expansion, land use and land occupation, is studied as environmental changes. In this work, physical-chemistry conditions and ge
Publicado em: 2007
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30. Trace elements in waters, sediments, and soils of Rio das Mortes Basin, Minas Gerais. / Elementos-traÃo em Ãguas, sedimentos e solos da Bacia do Rio das Mortes, Minas Gerais
The watershed of the Rio das Mortes is a region in the State of Minas Gerais characterized by several mining, iron works, industries, and tanneries. The aims of this study were: to establish natural background contents of trace elements for soils and sediments; and to identify sites contaminated by trace elements. In order to detect contamination spots, it w
Publicado em: 2006
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31. Geochemistry of soil and sediments and anthropogenic impact by trace elements, in the microbasin of the stream of the farm Santa Cândida, urban area of Campinas, São Paulo State / Geoquimica de solos e sedimentos e impacto antropico por elementos-traço, na microbacia do corrego da Fazenda Santa Candida, area periurbana de Campinas (SP)
A caracterização ambiental da microbacia do córrego da fazenda Santa Cândida, manancial periurbano de Campinas (SP), foi realizada a partir da classificação de solos e geoquímica multi-elementar (Ag, AI, As, Sa, Se, Si, Ca, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Ge, Hf, Hg, In, K, La, Li, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Rb, Sb, Sn, Se, Sr, Ta, Te, Th, Ti, Ta,
Publicado em: 2005
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32. Geoquimica e impacto ambiental do arsenio no Vale do Ribeira (SP-PR)
The sedimentary and volcanic rocks of the Ribeira Valley, in the Apiaf FoId Belt, host a variety of PbZn deposits, which were formed by singenetic (Perau-type) and epigenetic (Panelas-type) models. Long-term mining activities originated a toxic contamination by arsenic in the stream sediments of the Ribeira de Iguape river that drains the region. The purpose
Publicado em: 1997
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33. Discrimination Efficacy of Fecal Pollution Detection in Different Aquatic Habitats of a High-Altitude Tropical Country, Using Presumptive Coliforms, Escherichia coli, and Clostridium perfringens Spores
The performance of rapid and practicable techniques that presumptively identify total coliforms (TC), fecal coliforms (FC), Escherichia coli, and Clostridium perfringens spores (CP) by testing them on a pollution gradient in differing aquatic habitats in a high-altitude tropical country was evaluated during a 12-month period. Site selection was based on high
American Society for Microbiology.
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34. Classification of Antibiotic Resistance Patterns of Indicator Bacteria by Discriminant Analysis: Use in Predicting the Source of Fecal Contamination in Subtropical Waters
The antibiotic resistance patterns of fecal streptococci and fecal coliforms isolated from domestic wastewater and animal feces were determined using a battery of antibiotics (amoxicillin, ampicillin, cephalothin, chlortetracycline, oxytetracycline, tetracycline, erythromycin, streptomycin, and vancomycin) at four concentrations each. The sources of animal f
American Society for Microbiology.
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35. Environmental Factors Influencing Human Viral Pathogens and Their Potential Indicator Organisms in the Blue Mussel, Mytilus edulis: the First Scandinavian Report
This study was carried out in order to investigate human enteric virus contaminants in mussels from three sites on the west coast of Sweden, representing a gradient of anthropogenic influence. Mussels were sampled monthly during the period from February 2000 to July 2001 and analyzed for adeno-, entero-, Norwalk-like, and hepatitis A viruses as well as the p
American Society for Microbiology.
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36. New isotopic evidence for chronic lead contamination in the San Francisco Bay estuary system: Implications for the persistence of past industrial lead emissions in the biosphere
Measurements of lead isotope compositions in unfiltered San Francisco Bay waters from 1989 to 1998 have brought new insights into the cycling of anthropogenic lead in estuaries. Isotopic compositions of lead in the shallow (<2 m) southern reach were essentially invariant (∼90% derived from 1960s–1970s leaded gasoline) during the study period because
The National Academy of Sciences.