Determination Of Trace Gas
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Simultaneous GC-NCI-MS Determination of Persistent Organic Pollutants and Current-Use Pesticides in Breast Milk Samples
To preserve human health, persistent organic pollutants (POPs) and current-use pesticides (CUPs) should be monitored in fatty tissues, including breast milk. Therefore, this study aimed to optimize sample preparation conditions using a 32 factorial design for the determination of POPs and CUPs by gas chromatography coupled to mass spectrometry with negative
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Application of Bar Adsorptive Microextraction-Large-Volume Injection-Gas Chromatography-Mass Spectrometric Method for the Determination of Trace Levels of Agrochemicals in Real Matrices
Bar adsorptive microextraction followed by liquid desorption in combination with large volume injection gas chromatography coupled to mass spectrometry, under selected ion monitoring mode acquisition (BAµE-LD/LVI-GC-MS(SIM)), was applied for the determination of trace levels of different classes of agrochemicals (using alachlor, diniconazole, fenpropathrin,
J. Braz. Chem. Soc.. Publicado em: 2015-10
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3. Application of a low pressure spray chamber for the determination of mercury concomitantly to other trace elements by inductively coupled plasma mass spectrometry
Uma nova abordagem para introdução de amostras utilizando uma câmara de nebulização de baixa pressão foi empregada para a determinação de Hg e outros elementos por espectrometria de massa com plasma indutivamente acoplado. O sistema consiste de uma camara de nebulização ciclônica conectada a um nebulizador e a um tubo de sucção. A taxa de sucç�
J. Braz. Chem. Soc.. Publicado em: 2014-09
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4. Desenvolvimento de métodos cromatográficos hifenados (in-tube SPME/LC-FLD e GCxGC/qMS) para análises de fármacos e agrotóxicos em amostras complexas / Development of hyphenated chromatographic methods (in-tube SPME/LC-FLD and GCxGC/MS) for analysis of drugs and pesticides in complex samples.
Determination of trace levels of drugs in biological fluids and multiresidue (contaminants) in food samples is extremely important because this generates valuable data for therapeutic drug monitoring (individualization of dosage regimen) and quality control (food safety), respectively. Because of the demand for analytical methods with high resolution and low
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011
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5. 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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6. Utilização de líquens como bioindicadores de contaminação atmosférica por radionuclídeos naturais e metais em região impactada por TENORM / The use of lichens as bioindicators of atmospheric contamination by natural radionuclides and metals in a region impacted by TENORM
The main aim of this thesis is to study the possibility of using lichen as bioincicator of atmospheric pollution in regions contaminated by radionuclides, metals and rare earth elements. Two regions were chosen, one in Pirapora do Bom Jesus, where a tin and lead industry is located, and a second one in Cubatão, where a phosphate fertilizer industrial comple
Publicado em: 2010
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7. VALIDATION OF METHODS FOR WDXRF AND OES-SPARK TECHNIQUES IN STEEL ANALYSIS. DETERMINATION OF THE UNCERTAINTY OF MEASUREMENTS FOR API STEEL PLANT SAMPLE / Validação de métodos para as técnicas de WDXRF e OES -spark, na análise de aços. Cálculo de incerteza de medição para amostras de processo, aço classe API
The increase of gas and petroleum demanding in the national and international markets, the specification and certification of the chemical analysis results of gas and oil pipe-line have became more and more challenging. A continuous development has been outlined to improve API grade alloy steels (American Petroleum Institute). The steel properties depend on
Publicado em: 2009
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8. DETERMINAÇÃO DE ELEMENTOS MENORES E TRAÇO EM ROCHAS POR LA-ICPMS: PROGRESSOS NA UTILIZAÇÃO DE VIDROS BORATOS COMO ALVOS / DETERMINATION OF MINOR AND TRACE ELEMENTS IN ROCK SAMPLES BY LA-ICPMS: PROGRESS IN THE UTILIZATION OF BORATE GLASSES AS TARGETS
The present master dissertation is a continuation of a research study developed by Leite (2006) aiming at the multielemental analysis of rock samples (basalts, obsidians and shale) by inductively coupled plasma mass spectrometry (ICPMS), in combination with laser ablation (LA) and using borate glass as analytical targets. As in the former work, the experimen
Publicado em: 2009
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9. Desenvolvimento de um espectrômetro por absorção diferencial para medidas de poluentes na atmosfera / Development of a spectrometer using the differential optical absorption spectroscopy for measures of pollutants in the atmosphere
Este trabalho apresenta os resultados da construção de um espectrômetro utilizando a espectroscopia ótica por absorção diferencial (DOAS) para determinação de poluentes na atmosfera. A determinação e a quantificação de gases-traço contaminantes na atmosfera são possíveis pelo registro da transmitância, e posterior avaliação das estruturas d
Publicado em: 2007
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10. DETERMINATION OF MAJOR, MINOR AND TRACE ELEMENTS IN ROCK SAMPLES BY LA-ICPMS AFTER TARGET PREPARATION BY FUSION WITH LITHIUM BORATES / DETERMINAÇÃO DE ELEMENTOS PRINCIPAIS, MENORES E TRAÇOS EM ROCHAS VIA LA-ICPMS APÓS PREPARAÇÃO DE ALVOS POR FUSÃO EM BORATOS DE LÍTIO
A determinação de elementos traços em amostras de rocha por espectrometria de massas, combinada com ablação a laser (LA-ICPMS), tem se tornado uma importante ferramenta nas investigações em petrogênese, metalogênese e na prospecção de minérios. Apesar do surgimento de uma nova geração de lasers com menor duração de pulso (fs) e comprimento de
Publicado em: 2006
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11. Determination of the absolute threshold of detection and evaluation of trace levels of acetaldehyde in mineral water / Determinação do limiar de detecção absoluto e avaliação dos niveis residuais de acetaldeido em aguas minerais acondicionadas em garrafas de polietileno tereftalato (PET)
The consumption of mineral water in Brazil has been increasing significantly in the last few years. Consumers are becoming more demanding with respect to their buying habits and convenience for use. Due to a series of technical advantages the traditional glass package, high-density polyethylene and PVC for mineral waters have been replaced by the PET package
Publicado em: 2001