Dissolved Lead
Mostrando 1-12 de 41 artigos, teses e dissertações.
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1. Electroanalytical Method for Determination of Trace Metals in Struvite Using Electrochemically Treated Screen-Printed Gold Electrodes
We present an electroanalytical method using square-wave anodic stripping voltammetry on electrochemically-treated screen-printed gold electrodes to the simultaneous determination of lead(II), copper(II) and mercury(II) in struvite (natural fertilizer produced from urine). Electrochemical treatment via cyclic voltammetry of the working electrodes increased s
J. Braz. Chem. Soc.. Publicado em: 2020-09
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2. PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT
The recovery of precious and base metals of a metal concentrate from ground waste printed circuit boards (PCBs) is described in detail. Samples were treated with NaOHaq. to remove the soldering mask. Experiments were performed in acidic medium (HF, H2SO4, CH3COOH or H3PO4) using H2O2 as oxidant. Base metals were leached in high yields (>99 wt.%) at ~40 ºC a
Quím. Nova. Publicado em: 20/07/2020
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3. Films Formed on Carbon Steel in Sweet Environments - A Review
Corrosion of carbon steel pipelines in sweet environments has been extensively researched on oil and natural gas exploration and production in order to obtain efficient corrosion mitigation methods. Although the consequences of corrosion are known, the cause and mechanism by which a certain phenomenon occurs are still not well understood. Sweet corrosion is
J. Braz. Chem. Soc.. Publicado em: 04/07/2019
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4. COMPARISON OF REGENERATED CELLULOSE MEMBRANE COAGULATED IN SULPHATE BASED COAGULANT
ABSTRACT Regenerated cellulose properties can be altered and manipulated by various methods and procedures. Coagulation steps in cellulose regeneration process is one of the most crucial step in determining the final properties of the regenerated cellulose products. This study was conducted to investigate the effect of different type of coagulant on the prop
CERNE. Publicado em: 20/05/2019
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5. Phytochemical composition and chronic hypoglycemic effect of Rhizophora mangle cortex on STZ-NA-induced diabetic rats
ABSTRACT Type 2 diabetes is a major health problem in Mexico, as it is in other countries, is a chronic condition that develops when the body cannot produce enough insulin or cannot use it appropriately. Both insulin deficiency and insulin resistance lead to high blood glucose levels. In Mexico, people with diabetes are known to use the decoction of red mang
Rev. bras. farmacogn.. Publicado em: 2017-12
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6. CaracterizaÃÃo FÃsica, QuÃmica e BiolÃgica da Ãgua na Sub-Bacia B1, do Rio CocÃ, Fortaleza-CE, com Ãnfase nos Aspectos da PoluiÃÃo ao Longo de um Ciclo ClimÃtico / Characterization Physical, Chemical and Biological Water in Sub-Basin B1, Rio Coco, Fortaleza-CE, with Emphasis on Aspects of Pollution Along a Climate Cycle
This study aimed to evaluate the physical, chemical, biological, and the occurrence of both the acute toxicity and the diversity and quantity of phytoplankton biomass, along a climatic cycle, on sub-basin B1, a member of the Cocà River basin, Fortaleza - CE. The sampling occurred monthly on fourteen collecting points in the period of September 2010 to April
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
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7. Interação de forsterita-91 e da cisteína em condições de química prebiótica utilizando diferentes técnicas espectroscópicas, químicas e mineralógicas
This work simulated prebiotic conditions existed on primordial Earth and studiedthe interaction between forsterite-91, cysteine and artificial seawater. These interactions were studied in aqueous medium at two values of pH 2.0 and 8.0. The samples of olivine plus distilled water and artificial seawater were mixed for 24h, centrifuged, the solids and supernat
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/02/2012
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8. DETERMINATION OF TOTAL AS IN OCEANIC WATER BY HG AFS / DETERMINAÇÃO DE AS TOTAL EM ÁGUAS OCEÂNICAS POR HG AFS
The increase in industrial activity has increased human exposure to metals and metalloids exponentially. In this context, arsenium is a good example, being increasingly found in several natural environments. It is an element with no essential biological function, and possessed of elevated toxicity. The discharge of toxic elements in aquatic bodies can promot
Publicado em: 2010
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9. Estudo dos metais traço (zinco, cádmio e chumbo) em duas regiões do complexo estuarino-lagunar de Cananéia-Iguape(SP) sob diferentes pressões antrópicas / Trace metals study (zinc, cadmin and lead) in two regions of Cananéia-Iguape (SP) estuarine-lagoon system submitted to different anthropic pressures
Os setores sul e norte do complexo estuarino lagunar de Cananéia-Iguape, sujeitos a diferentes pressões antrópicas, foram estudados quanto às características hidrológicas e hidroquímicas das águas de superfície e fundo, com ênfase às concentrações de zinco, cádmio e chumbo dissolvidos. A amostragem contou com coletas espaciais e temporais, em d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/10/2009
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10. A exposição aguda ao chumbo induz danos no DNA de vários tecidos do peixe Prochilodus lineatus
Currently there are many works describing the presence of metal pollution in water bodies. Among these metals, lead (Pb) is considered a chemical of great environmental impact due to its high toxicity to live organisms and its wide use in the industrial process of many products. Considering its toxicity and the lack of knowledge concerning lead effects to ne
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/02/2009
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11. Remoção de Chumbo e Bário de um efluente aquoso via flotação por ar dissolvido / Removal of Lead and Barium from a waste water by dissolved air flotation
A remoção de metais presentes em soluções aquosas em concentrações reduzidas (entre 10-7 e 10-4 mols.dm-3) não encontra resultados satisfatórios nos métodos tradicionais pois não alcançam os resultados adequados para o enquadramento do efluente nos parâmetros de emissão de resíduos líquidos. A técnica de remoção de metais pesados presentes
Publicado em: 2009
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12. Estudo hidrogeológico de um aterro sanitário instalado em uma antiga área de disposição irregular de resíduos sólidos / Hydrogeological research of a landfill set up in a previously irregular solid waste disposal area
In the past, the disposal of solid residue without any type of treatment and control was a common and widespread practice. As a result of that, the old areas used as dump have become a serious environmental and public health problem. Some of these areas are being reused in constructions now known as landfills, this time in a way that they arent a threat anym
Publicado em: 2009