Literature study of microwave-assisted digestion using electrothermal atomic absorption spectrometry

Chakraborty, Ruma; Das, Arabinda; Cervera, M. Luisa; Guárdia, Miguel de la

doi:10.1007/s0021663550099

Cited by 46 publications

(15 citation statements)

References 40 publications

(165 reference statements)

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“…Microwave procedures have been widely used for sample digestion in atomic spectrometric analysis (Matusiewicz et al 1988, Chakraborty et al 1996, Pérez-Cid et al 1999, Michael et al 1991, for the acceleration of organic reactions (Bordera et al 1996, Sturgeon et al 1995) and lately some work has been made as a technique for sample extraction (de Pedro et al 1997, García-Ayuso et al 1999.…”

Section: Microwave Extractionmentioning

confidence: 99%

Alternative methods for the wool wax extraction from wool scouring wastes

López‐Mesas¹,

Carrillo²,

Gutiérrez³

et al. 2007

Grasas y Aceites

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Métodos alternativos para la extracción de la cera de lana contenida en efluentes residuales generados tras lavados industriales de lana.Las fibras de lana, tras obtenerlas de las ovejas y antes de ser procesadas industrialmente, han de ser lavadas. Este proceso genera residuos altamente contaminantes que pueden obtenerse en dos formas diferentes, una fase líquida y una fase sólida. Ambas fases contienen, entre otros, una gran cantidad de la grasa generada por las ovejas y que se puede recuperar y purificar para obtener lanolina, un producto de alto valor industrial. Para evaluar la cantidad de grasa contenida en dichos efluentes, la técnica más extendida en los laboratorios es la extracción por Soxhlet, la cual consume tiempo y disolventes orgánicos pero obteniendo altos porcentajes de recuperación. En el presente trabajo se compara el porcentaje de recuperación de la cera de lana de efluentes industriales mediante técnicas alternativas a la tradicional (Microondas, Soxhlet automatizado y Fluidos Supercríticos) obteniendo recuperaciones del 100%, reduciendo el tiempo de análisis, el consumo de disolvente y la generación de residuos.PALABRAS-CLAVE: Cera de lana -Extracción por fluidos supercríticos -Microondas -Soxhlet automatizado.

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Section: Microwave Extractionmentioning

confidence: 99%

Alternative methods for the wool wax extraction from wool scouring wastes

López‐Mesas¹,

Carrillo²,

Gutiérrez³

et al. 2007

Grasas y Aceites

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“…With the aim of shortening the time and the total volume of reagents, and to avoid contamination in the digestion process, the use of microwave sample pre-treatment is increasing, as shown by the large number of reviews dealing with the principles. 6,10,[12][13][14] The main microwave-assisted digestions described for chromium determination in plants consist of microwave PTFE closed-vessel attacks using different acidic mixtures for short periods of time. [15][16][17] In this work, different digestion procedures for the determination of Cr in plants were studied with the aim of establishing a suitable method that ensures no losses of volatile chromium compounds, has the ability to use as little reagent as possible and is rapid.…”

Section: Introductionmentioning

confidence: 99%

Classical wet ashing versus microwave-assisted attacks for the determination of chromium in plants

Sahuquillo¹,

Rubio²,

Rauret³

1999

Analyst

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Microwave-assisted pre-treatments for the determination of Cr in plants are compared with classical wet-ashing procedures using open attacks in sand-baths. Four certified plant reference materials were analysed: pine needles (NIST SRM 1575), rye grass (BCR CRM 281), beech leaves (BCR CRM 100) and an aquatic plant (Trapa natans) (BCR CRM 596). The use of acidic procedures with HClO 4 or H 2 SO 4 yielded different Cr results for these materials when classical wet-ashing procedures were used, as the use of HClO 4 caused losses of volatile chromium compounds. The shorter time of analysis required (60 min) in open-focused microwave-assisted attack allows the use of HClO 4 for obtaining results very close to the certified values for CRM plant materials. This type of microwave digestion also led to good reproducibility values with relative standard deviations between 5 and 10%.

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“…The effects taking place when using microwave radiation for the acceleration of chemical and physical processes are so significant that chemists who have applied these microwave systems for the dissolution of samples in the routine analysis of various objects [1][2][3][4] speak of a 'microwave revolution' in sample preparation. 5 The theoretical aspects of microwaveassisted decomposition have not been considered since the paper of Kingston and Jassie, 6 in which thermodynamic equations were used in the calculation of heating parameters based on direct temperature measurements.…”

mentioning

confidence: 99%