Natural Waters
Mostrando 13-24 de 324 artigos, teses e dissertações.
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13. Use of a Digital Image in Flow Analysis: Determination of Nitrite and Nitrate in Natural Waters
A webcam is proposed as the detector in a flow system with multicommutation, and the feasibility of the approach is demonstrated in the determination of nitrate and nitrite in natural waters. The typical transient signal inherent to the flow system was obtained using a digital video and quantified by ImageJ software. The linear dynamics range for nitrite and
J. Braz. Chem. Soc.. Publicado em: 2016-01
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14. EVALUATING ARSENIC AND MANGANESE REMOVAL FROM WATER BY CHLORINE OXIDATION FOLLOWED BY CLARIFICATION
AbstractThis paper investigates the simultaneous removal of arsenic [As(V) or As(III)] and manganese [Mn(II)] from natural waters of low and high turbidity by clarification (with polyaluminum chloride and aluminum sulfate as primary coagulants) associated or not with chlorine pre-oxidation. The results showed that the clarification process exhibited low Mn(I
Braz. J. Chem. Eng.. Publicado em: 2015-06
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15. Noteworthy Method for Direct Determination of SbIII and Total Inorganic Antimony in Natural Waters
A procedure was developed for the direct determination of SbIII and total inorganic Sb in water samples by hydride generation atomic absorption spectrometry (HG AAS), without pre-reduction of SbV. The NaBH4 concentration was maintained at 0.4% (m/v) to perform the selective generation of stibine from SbIII and online stibine generation was carried out with 5
J. Braz. Chem. Soc.. Publicado em: 2015-05
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16. VALIDAÇÃO INTRALABORATORIAL DA DETERMINAÇÃO DE METILTESTOSTERONA EM ÁGUAS NATURAIS POR VOLTAMETRIA USANDO ELETRODO DE GOTA PENDENTE DE MERCÚRIO
17α-methyltestosterone (17α-MT) is a hormone used in medicine and aquaculture which can be found in natural waters. It is considered an emerging organic pollutant and its accurate and precise analysis is required. Therefore, this study presents the in-house validation of a new voltammetric methodology for 17α-MT analysis in natural waters. A hanging mercu
Quím. Nova. Publicado em: 2015-03
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17. DISPOSITIVOS DGT MODIFICADOS COM MATERIAIS ALTERNATIVOS PARA USO NA ESPECIAÇÃO DE ELEMENTOS TRAÇO
The use of MT-K10 Montmorillonite immobilized onto agarose was investigated in this work as an alternative binding phase in Diffusive Gradient in Thin Film (DGT) devices for the determination of metallic labile species. In addition, agarose itself was also used as the diffusive phase. The percentage of sorption of Zn2+, Cu2+, Cr3+, Mn2+, Cd2+, Pb2+, and Ni2+
Quím. Nova. Publicado em: 2015-03
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18. Yearly variation of bacterial production in the Arraial do Cabo protection area (Cabo Frio upwelling region): an evidence of anthropogenic pressure
Arraial do Cabo is where upwelling occurs more intensively on the Brazilian coast. Although it is a protection area it suffers anthropogenic pressure such as harbor activities and sporadic sewage emissions. Short-time studies showed a high variability of bacterial production (BP) in this region but none of them evaluated BP during long periods in a large spa
Braz. J. Microbiol.. Publicado em: 2013-12
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19. Injuries by marine and freshwater stingrays: history, clinical aspects of the envenomations and current status of a neglected problem in Brazil
Stingrays are a group of rays – cartilaginous fish related to sharks – that have whiplike tails with barbed, usually venomous spines and are found around the world, especially the marine species. Despite recent reports of accidents involving these fish, they are not aggressive, reacting only when stepped on or improperly handled. Injuries by stingrays ar
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 29/07/2013
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20. Evaluation of the environmental sustainability of massive forestry fragments of the coastal plain and lower slopes of Bertioga (SP) / Avaliação da sustentabilidade ambiental dos fragmentos de maciços florestais da planície costeira e baixa encosta do município de Bertioga (SP)
The São Paulo coastal zone alternates extensive zones of great diversity of biotopes with others intensively degradated. These characteristics are observed in the municipality of Bertioga and its forest regions localized among Itaguaré and Guaratuba river basins. Due to their special characteristics these basins are denominated Bertioga System. The aim of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/11/2012
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21. ÁGUAS DO CEARÁ: política pública de territorialidades conflituosas. / WATERS CEARÁ: territorialities conflicting public policy.
A discussão sobre a apropriação da água na sociedade capitalista é tema antigo e revisitado. Entretanto, tornou-se um tema bem atual considerando as territorialidades produzidas pelos conflitos gerados na criação de valor, associados à política de recursos hídricos e em meio à problemática ambiental de agressão, escassez e abuso de poder na apro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2012
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22. Canal do Valo Grande: Governança das águas estuarinas na perspectiva da aprendizagem social / Valo Grande Channel: estuarine waters governance in the social learning perspective
A publicação da lei 9.433 de 1997, que institucionaliza a Política Nacional de Recursos Hídricos no Brasil, abriu a perspectiva de uma gestão integrada, participativa e descentralizada dos recursos hídricos. A integração da gestão de bacias hidrográficas com a gestão da zona costeira é uma diretriz dessa política e a participação social é pre
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/04/2012
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23. Análise espacial e temporal de dados fisicos e químicos de águas superficiais, das sub-bacias do rio Turvo Sujo e do ribeirão São Bartolomeu, por quimiometria / Spatial and temporal analysis of chemical and physical data of surfaces waters, of the sub basins of the Turvo Sujo river and São Bartolomeu stream, by chemometrics
Este trabalho teve como objetivo analisar a variação espacial e temporal de dados físicos e químicos de águas superficiais coletadas em 23 pontos, sendo 15 pontos ao longo da sub-bacia do Rio Turvo Sujo e 8 pontos ao longo da sub-bacia do Ribeirão São Bartolomeu, da zona da mata mineira durante nove meses de amostragem. Os dados físico-químicos fora
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/02/2012
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24. A reinserção dos cursos de água em áreas urbanas. Estudo de caso: Microbacia do Córrego Jataí - Uberlândia /MG / The reinsertion of the watercourses in urban areas. Case study: the Stream watershed Jataí - Uberlândia/MG
The main objective of this work is to promote the reinsertion of urban water in the context of physical and territorial planning, in the cities, through the study of the watershed of Jataí stream in Uberlândia-MG. Pursuiting the rebalancing of the waters with the urban environment, this work promote the connectivity and physical strengthening of the relati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/01/2012