Mecanização no preparo de amostras por microondas: o estado da arte

Arruda, Marco Aurélio Zezzi; Santelli, Ricardo Erthal

doi:10.1590/s0100-40421997000600012

Cited by 29 publications

(31 citation statements)

References 15 publications

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“…18,[33][34][35] Examples are heavy metal determination in waste-waters or liquid foodstuffs such as beer and wine. 18 Ultraviolet radiation decomposition requires the addition of a small amount of acid plus hydrogen peroxide to the sample, without a significant increase in the temperature.…”

Section: Wet Dissolution-radiant Energy-ultraviolet Radiationmentioning

confidence: 99%

“…[4][5][6][7][8][9]18,19,[34][35][36][37] The interaction of microwave radiation (2450 MHz, 12.2 cm) with sample and reagents causes both ionic migration and dipole rotation, resulting in fast heating of the mixture with consequent decomposition.…”

Section: Wet Decomposition-radiant Energy-microwave Radiationmentioning

confidence: 99%

“…4 Microwave assisted flow digestion can be performed in continuous flow systems, stopped flow systems, ambient pressure systems or pressurized systems; several examples have been presented in the literature. 18,[34][35][36][37][38][39][40][41] These systems save time and reagents and have broad applications. By accelerating the reaction through rapid heating, such systems make it feasible to generate reaction products quickly and in larger quantities.…”

Section: Wet Decomposition-radiant Energy-microwave Radiationmentioning

confidence: 99%

“…Generally a flow system is incorporated into a microwave oven, and the digested sample is collected in flasks, opened for subsequent analysis by some appropriate analytical technique or transported directly to a detector coupled in line with the microwave oven. 34 …”

Section: Wet Decomposition-radiant Energy-microwave Radiationmentioning

confidence: 99%

“…34,51,[63][64][65][66][67] A review about mechanization for sample pretreatment has been published by Arruda and Santelli. 34 Han et al 64 presented a microwave system that allows the decomposition of the sample and the evaporation of the digestates for trace element determination in silicabased materials.…”

Section: Microwave Plus Ultraviolet Radiation/automation and Roboticsmentioning

confidence: 99%

See 4 more Smart Citations

Sample preparation for atomic spectroscopy: evolution and future trends

Oliveira¹

2003

J. Braz. Chem. Soc.

140

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A preparação da amostra é a etapa crítica dentro de um protocolo analítico e envolve desde a simples diluição até a solubilização parcial ou total. Métodos de decomposição por via seca ou úmida, envolvendo o aquecimento das amostras em sistemas abertos ou fechados, utilizando várias formas de energia como térmica, ultra-som ou radiante (infravermelho, ultravioleta e microondas) são empregados. O presente e o futuro da preparação de amostras consideram também solubilização em linha de amostras, lixiviação dos analitos de interesse, especiação, análise de suspensão, análise in situ, in vivo etc. Ênfase foi dada para o preparo de amostras para espectroscopia atômica. Atualmente, os objetivos a serem alcançados envolvem a obtenção do melhor resultado, no menor tempo, com mínima contaminação, pouco gasto de reagente e pequena geração de resíduos e efluentes, bem como a integridade das amostras e traceabilidade dos resultados, tendo em mente a qualidade e confiança nos resultados de medições, como requerido pela comunidade e usuários.Sample preparation is the critical step of any analytical protocol, and involves steps from simple dilution to partial or total dissolution. The methods include dry or wet decomposition of the samples in open or closed systems, using thermal, ultrasonic or radiant (infrared, ultraviolet and microwaves) energy. This review emphasizes sample preparation for atomic spectroscopy. The present and future tendencies for sample preparation also involve on-line dissolution, extraction of the analytes, speciation, solid sample and slurry analysis, in situ and in vivo procedures, etc. Nowadays the goals are the best result, in the shortest time, with minimum contamination, using the smallest quantities of reagents and samples, and having low residue and waste generation, as well as maintaining the integrity of the sample and the traceability of the results, to have quality and confidence in the measurements as the primordial attributes required by the community and by the users.

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Section: Wet Dissolution-radiant Energy-ultraviolet Radiationmentioning

confidence: 99%