Lead And Barium
Mostrando 1-12 de 22 artigos, teses e dissertações.
-
1. DETERMINATION OF TOTAL AND BIOACCESSIBLE ELEMENTS IN TEMPORARY ADHESIVE TATTOOS USED BY CHILDREN AND ADULTS
The presence of bioaccessible potentially-toxic elements in five different brands of temporary tattoos (packaged with bubble gums) aimed at children and three product brands used by young and adult audiences were analyzed in accordance with the Brazilian Organization of Technical Standards (ABNT) and International Organization for Standardization (ISO) for t
Química Nova. Publicado em: 2022
-
2. Barium and its Importance as an Indicator of (Paleo)Productivity
ABSTRACT Barium (Ba) is a trace element which occurs predominantly as barite mineral (BaSO4) in the marine environment. Previous work suggests that barite concentrations are related to the organic carbon flux and marine biological debris in the water column suggesting a direct or indirect involvement in the marine biological cycling. In addition, barite has
An. Acad. Bras. Ciênc.. Publicado em: 2016-12
-
3. Essential minerals and inorganic contaminants (barium, cadmium, lithium, lead and vanadium) in dried bee pollen produced in Rio Grande do Sul State, Brazil
Abstract Like other beehive products, such as honey, royal jelly and propolis, bee pollen has attracted great interest because of the health benefits it can provide when consumed. Bee pollen has high contents of sugars and proteins and a low content of lipids, it is also a rich source of vitamins and other bioactive compounds, which makes it an attractive mi
Food Sci. Technol. Publicado em: 03/06/2016
-
4. ESTUDO DO EFEITO DE MATRIZ NA DETERMINAÇÃO DE METAIS EM ÓLEOS BÁSICOS RERREFINADOS POR FLUORESCÊNCIA DE RAIOS X POR ENERGIA DISPERSIVA
In this article, the results of the study of the matrix effect in the determination of metals calcium, chromium, iron, nickel, copper, zinc, molybdenum, cadmium, barium and lead in base oil using Energy Dispersive X-Ray Fluorescence (EDX) are presented. Sensitivities obtained for each calibration curve were evaluated where calcium, chromium, copper, cadmi
Quím. Nova. Publicado em: 2015-06
-
5. Determinação espectrofotométrica de sulfato em álcool etílico combustível empregando dibromosulfonazo III
A sensitive spectrophotometric method was developed for sulphate determination in automotive ethanol fuel. The method based on the reaction of the analyte with barium-dibromosulphonazo(III) complex lead to a decrease in the magnitude of the absorbance signals monitored at 649 nm. No sample pretreatment is required and the proposed method allows sulphate dete
Quím. Nova. Publicado em: 2013
-
6. Fitoextração em solo contaminado com metais pesados / Phytoextraction of soil contaminated with heavy metals
The industrial and urban progress associated with increased production of consumer goods has resulted in the generation of waste, which, for a long time, was indiscriminately discarded in the environment, causing damage usually irreversible to recover. Two experiments were conducted in soils contaminated with heavy metals: the first aimed at the disposal of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011
-
7. Addition of magnetic markers for non-destructive evaluation of polymer composites
Polymer composite pipes are an appealing option as a substitute for conventional steel pipes, particularly due to their inherent corrosion resistance. However, the composite pipes currently used do not allow non-destructive evaluation (NDE) using instrumented devices which operate with magnetic sensors. The present work aims at the development of polymer com
Materials Research. Publicado em: 28/10/2011
-
8. Qualidade da água na microbacia do Córrego Fundo, municípios de Catalão e Ouvidor (G0): uma análise geoquímica / Water quality in the watershed of the Stream Fund, municipalities Catalan and Ombudsman (G0): a geochemical analysis
The human action can change aspects of water quality restricting the possible uses of water resources. It integrates the impacts of human activities, but in that regards it as a social concept. The research shows the results of water quality with a view to understanding the geochemical features and anthropic that alters the dynamics of the environment. Thus,
Publicado em: 2010
-
9. Determination of the presence of Barium, Lead and Crhomium in the groundwater samples colleted in the Aquifer Bauru / Determinação da presença de Bário, Chumbo e Crômio em amostras de água subterrânea coletadas no Aqüífero Bauru
The occurrence of chemical element in groundwater has a great importance in the world because of the diversity of toxic effects and wide distribution in the environment. Between these chemical elements, we can cite barium, lead and chromium that can induce diverse effects such neurotoxicity and carcinogenicity. It has been considered that the aquifer Bauru h
Publicado em: 2009
-
10. Desenvolvimento de bloco de vedação com barita na composição de partida para blindagem de radiação X
This work main objective is to study the use of bricks in barium X-rays rooms in order to contribute to the optimization of shielding rooms diagnosis. The work was based on experimental measurements of X-ray attenuation (40 to 150 kV), using ceramic seal bearing the incorporation of barium sulfat (BaSO4). Different formulations were studied in three differen
Publicado em: 2009
-
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
-
12. Processos litográficos em filmes epitaxiais de compostos IV-VI para medidas Hall e o estudo da dopagem do telureto de chumbo com flureto de bário / Lithographic processes in epitaxial films of IV-VI compounds for Hall measurements and the study of lead telluride doping with barium flouride
The first part of the work dealt with the application of lithographical techniques to fabricate Hall geometry of IV-VI films grown on (111) BaF_2 substrates. A previous study of In diffusion in PbTe films confirmed the viability of using In as a metallic contact. During the lithographic process, some solutions were implemented to resolve the problems generat
Publicado em: 2009