Ultrasonic bath in container preparation for storage of seawater samples in trace metal analysis

Kinsella, Brian; Willix, Rodney L.

doi:10.1021/ac00251a052

Cited by 13 publications

(5 citation statements)

References 14 publications

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“…Normally, one finds that at a temperature of around 50°C, the extraction efficiency is favored due to the increase in the number of acoustic cavitation nuclei in the proximities of the surface of the solid phase of the suspension (solid-liquid system). (Klnsella and Willix 1982;Patnaik and Muralidhar 1995;Elik 2005). However, when the temperature of the extraction medium approaches the ebullition temperature of the liquid phase, there is a drop in sonication efficiency because the surface tension of the medium decreases and the vapor pressure inside the microbubbles increases, causing the shock waves to decrease (Elik 2007).…”

Section: Resultsmentioning

confidence: 99%

“…The intensity of the ultrasound transmitted to the medium is related directly with the amplitude of the vibration of the sonotrode tip in contact with the solid sample/extractor suspension (Klnsella and Willix 1982;Patnaik and Muralidhar 1995;Elik 2005;Elik 2007). Normally, an increase in power intensity will favor an increase of the chemical effects caused by sonication.…”

Section: Optimization Of Ultrasound Powermentioning

confidence: 99%

“…It was therefore decided to use the amplitude of 40% W (corresponding 136 W) in all the remaining experiments, since this power causes a lower increase in the extractor solution temperature of 62°C compared to 76°C and 84°C at amplitudes of 50% to 60% W of power (170-204 W). (Klnsella and Willix 1982;Patnaik and Muralidhar 1995;Elik 2005;Elik 2007). …”

Section: Optimization Of Ultrasound Powermentioning

confidence: 99%

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Evaluation of Cu, Mn, and Se in Vegetables Using Ultrasonic Extraction and GFAAS Quantification

et al. 2010

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This paper proposes a method for the determination of copper, manganese, and selenium in vegetables of conventional and organic farming in the state of São Paulo/ Brazil using ultrasonic extraction of analytes and subsequent quantification by graphite furnace atomic absorption spectrometry (GFAAS). Using 0.10 mol L −1 of hydrochloric acid as the extracting solution, the following optimal extraction conditions were established: sample mass of 100 mg, sample grain size of <60 μm, sonication time of five cycles of 40 s, and sonication power of 136 W. The analytes were determined by GFAAS, applying drying temperatures of 90°C to 250°C, pyrolysis temperature of 1,300°C, atomization temperature of 2,300°C, and cleaning temperature of 2,800°C. Palladium nitrate was co-injected with the samples as a chemical modifier and tungsten as a permanent modifier. The accuracy and precision of the proposed extraction method were evaluated based on a certified standard, RM 8433 Corn Bran (NIST RM 8433). The results obtained by the ultrasonic extraction method were equivalent to those obtained by the method of acid mineralization of samples in a microwave oven. However, the proposed methodology reduces the analytical time considerably, favoring the analytical speed. Moreover, the quantity of residues generated and discharged into the environment is also considerably lower.

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Section: Resultsmentioning

confidence: 99%

Section: Optimization Of Ultrasound Powermentioning

confidence: 99%

Section: Optimization Of Ultrasound Powermentioning

confidence: 99%

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Evaluation of Cu, Mn, and Se in Vegetables Using Ultrasonic Extraction and GFAAS Quantification

et al. 2010

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“…Entre as várias outras aplicações dos ultra-sons para a determinação de metais, destacam-se a formação de suspensões para análise direta em sólidos [17], descontaminação de recipientes para armazenamento de amostras [18] e favorecimento cinético de reações de complexação [19]. É importante ressaltar que, nas situações acima mencionadas, a integridade e identidade das espécies de interesse foram mantidas seguindo o critério da rastreabilidade [20].…”

Section: Ultra-sons No Preparo De Amostras E Tratamento De Efluentesunclassified

Algumas aplicações analíticas dos ultra-sons

Korn¹,

Pereira²,

Borges³

2005

BSPQuimica

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“…Acidification, however, changes the physicochemical distribution of lead species and therefore must not be used prior to speciation. Generally, the sample should be analysed immediately or stored in Teflon or polyethylene containers, which are considered to be the most suitable [35,36]. Unacidified natural water samples may be stored at 4 ~ in the dark for up to 3 months without any measurable changes in the distribution of lead species [34,36].…”

Section: Watersmentioning

confidence: 99%