Arsenate
Mostrando 1-12 de 264 artigos, teses e dissertações.
-
1. DETERMINATION OF FOUR ARSENIC SPECIES IN ALGAE BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY COUPLED WITH HYDRIDE GENERATION ATOMIC FLUORESCENCE SPECTROMETRY
A rapid method has been developed for the determination of silver arsenite As(III), dimethylated arsenic DMA, monomethylated arsenic MMA, and arsenate As(V) in algae sample using liquid chromatography coupled with hydride generation atomic fluorescence spectrometry (LC-HG-AFS). Types, flow rate and pH of mobile phase were optimized. Under the optimal conditi
Quím. Nova. Publicado em: 2020-09
-
2. African star grass response to postemergence herbicides
RESUMO A grama estrela africana (Cynodon nlemfuensis Vanderyst) é considerada excelente forrageira. Contudo, há poucas informações disponíveis sobre o manejo de plantas daninhas em áreas de grama estrela. Dois experimentos foram realizados em 2017 e 2018 para avaliar a resposta da grama estrela africana a herbicidas pós-emergentes. Os tratamentos fora
Ciênc. agrotec.. Publicado em: 27/05/2019
-
3. EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
Electron paramagnetic resonance (EPR) and optical absorption studies of xMgO- (25-x) Li2O-50B2O3-25As2O3 glasses were made by introducing Cu2+ as a spin probe. The EPR spectra of all the glass samples recorded at X-band frequencies have similar spectral features. The Cu2+ ions are in well-defined axial sites, but subjected to small distortion leading to the
Mat. Res.. Publicado em: 01/12/2016
-
4. Behavior of Eucalyptus urophylla and Eucalyptus citriodora Seedlings Grown in Soil Contaminated by Arsenate
ABSTRACT Persistent areas of tailings and deposits from coal and gold mining may present high levels of arsenic (As), mainly in the arsenate form, endangering the environment and human health. The establishment of vegetation cover is a key step to reclaiming these environments. Thus, this study aimed to evaluate the potential of Eucalyptus urophylla and E. c
Rev. Bras. Ciênc. Solo. Publicado em: 2016
-
5. Nanomagnetite-Zeolite Composites in the Removal of Arsenate from Aqueous Systems
Composites based on nanosized particles of magnetite and natural microsized zeolite were prepared and their efficiency to adsorb arsenate from aqueous systems was evaluated through kinetic data and adsorption isotherms, considering the proportion of magnetic iron oxide, composite:solution ratio and zeolite particle size. A well-crystallized nanomagnetite wit
J. Braz. Chem. Soc.. Publicado em: 2015-09
-
6. Isolation and characterization of arsenic resistant bacteria from wastewater
The present study proposed the isolation of arsenic resistant bacteria from wastewater. Only three bacterial isolates (MNZ1, MNZ4 and MNZ6) were able to grow in high concentrations of arsenic. The minimum inhibitory concentrations of arsenic against MNZ1, MNZ4 and MNZ6 were 300 mg/L, 300 mg/L and 370 mg/L respectively. The isolated strains showed maximum gro
Braz. J. Microbiol.. Publicado em: 2014-12
-
7. Classificação de resíduos de madeira tratada com preservativos à base de arseniato de cobre cromatado e de boro/flúor
Classification of waste wood treated with chromated copper arsenate (CCA) and boron/fluorine preservatives, according to NBR 10004, was investigated. The leaching test (ABNT NBR 10005) for As and Cr, and solubilization test (ABNT NBR 10006) for F, were applied to out-of-service wooden poles. Concentrations of As and Cr in leachates were determined by ICP-MS
Quím. Nova. Publicado em: 2012
-
8. Penetração e retenção de arseniato de cobre cromatado em madeira de eucalipto / Penetration and retention of chromated copper arsenate in eucalypt timber
O objetivo deste trabalho foi avaliar a penetração e retenção de arseniato de cobre cromatado (CCA tipo C) nas madeiras de Eucalyptus citriodora, Eucalyptus cloeziana, Eucalyptus camaldulensis x Eucalyptus grandis e de um híbrido natural de Eucalyptus urophylla, com origem paternal desconhecida, visando à produção de moirões. As árvores tinham idad
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
-
9. Adsorção e dessorção de arsênio por hidróxidos duplos lamelares e seu emprego na remoção deste elemento de águas / Arsenic adsorption and desorption by layered double hydroxides and its use in removing arsenic from water
Este trabalho aborda inicialmente a problemática do efeito e das conseqüências da contaminação de organismos por arsênio. Trata também da síntese e caracterização de argilas aniônicas do tipo Hidróxido Duplos Lamelar (HDL), a escolha da melhor argila e aplicação das mesmas para remoção de arsêniato (As(V)) de águas contaminadas. As é um el
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/01/2011
-
10. Testicular morphology and morphometry in mice chronically exposed to arsenic / Morfologia e morfometria testicular de camundongos adultos submetidos à exposição crônica ao arsenato
There is an increasing concern about the potentially harmful effects of several environmental pollutants, as for instance, the inorganic arsenic, one of the main pollutants of the water worldwide. The intoxication by arsenic can be acute or chronic, and lead to a variety of pathologies and impairment of male reproductive system. This work aimed to investigat
Publicado em: 2009
-
11. Implementação da análise de acoplamentos estatísticos e sua aplicação à família de proteínas tirosina fosfatases / Implementation of the statistical coupling analysis and its application to the Protein Tyrosine Phosphatases family.
A Análise de Acoplamentos Estatísticos é uma técnica computacional capaz de identificar resíduos importantes para a estrutura e função de proteínas em uma família por meio da quantificação de conservação posicional, correlação entre posições e identificação de grupos de resíduos correlacionados entre si. Neste trabalho, a análise de acop
Publicado em: 2009
-
12. AvaliaÃÃo das concentraÃÃes de elementos quÃmicos nos sedimentos de fundo do estuÃrio do Rio Formoso (PE)
The estuary of Formoso river is located in the south coastal zone of the Pernambuco state, in an environmental protection area, named APA of Guadalupe. This is an important coastal ecosystem with a rich biodiversity, which plays an important socioeconomic role for the local population. Anthropogenic activities such as shrimp farming, sugar cane cultivation,
Publicado em: 2009