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

Sahuquillo, A.; Rubio, R.; Rauret, G.

doi:10.1039/a808659a

Cited by 14 publications

(4 citation statements)

References 16 publications

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“…Recent studies have used the open-vessel microwaves for plant digestion, eliminating the need for ashing prior to digestion [3], and enables the use of strong oxidant acids with HF [4]. A focused microwave has also been used for online HCl digestion of slurries of oxide materials [5].…”

Section: Introductionmentioning

confidence: 99%

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Acid digestion of geological and environmental samples using open-vessel focused microwave digestion

Taylor

Toms

Longerich

2002

Analytical and Bioanalytical Chemistry

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The application of open vessel focused microwave acid digestion is described for the preparation of geological and environmental samples for analysis using inductively coupled plasma-mass spectrometry (ICP-MS). The method is compared to conventional closed-vessel high pressure methods which are limited in the use of HF to break down silicates. Open-vessel acid digestion more conveniently enables the use of HF to remove Si from geological and plant samples as volatile SiF4, as well as evaporation-to-dryness and sequential acid addition during the procedure. Rock reference materials (G-2 granite, MRG-1 gabbros, SY-2 syenite, JA-1 andesite, and JB-2 and SRM-688 basalts) and plant reference materials (BCR and IAEA lichens, peach leaves, apple leaves, Durham wheat flour, and pine needles) were digested with results comparable to conventional hotplate digestion. The microwave digestion method gave poor results for granitic samples containing refractory minerals, however fusion was the preferred method of preparation for these samples. Sample preparation time was reduced from several days, using conventional hotplate digestion method, to one hour per sample using our microwave method.

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Section: Introductionmentioning

confidence: 99%

“…The removal of HF also eliminates the need for sample introduction systems that are HF resistant, or the addition of large quantities of boric acid to complex the fluoride. Digestion using HF can also be necessary in biological samples to break down siliceous structures in plants [4].…”

Section: Introductionmentioning

confidence: 99%

Acid digestion of geological and environmental samples using open-vessel focused microwave digestion

Taylor

Toms

Longerich

2002

Analytical and Bioanalytical Chemistry

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“…In addition, dry ashing methods are sometimes discouraged due to possible losses of volatile elements (Stoeppler 1992). Procedures involving microwave ovens are often employed for sample digestion (Sahuquillo et al. 1999).…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Contents of Vegetables Grown in Soil, Irrigated with Mixtures of Wastewater and Sewage Sludge in Pakistan, using Ultrasonic‐Assisted Pseudo‐digestion

Jamali¹,

Kazi²,

Arain³

et al. 2007

J Agronomy Crop Science

123

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The success of risk assessment of metal-contaminated soils depends on how precisely one can predict the bioavailability of trace and toxic metals in soil and transfer to the human food chain. A field experiment was carried out from 2004 to 2005 to evaluate the long-term effect of sewage sludge application in agricultural lands where mostly vegetables are grown. The aim of this study was to predict the uptake of Cd, Cu, Cr, Ni, Pb and Zn by different vegetables grown on agricultural soil irrigated for long period with untreated domestic waste water and sewage sludge (SIDWS) as test samples and for comparative purposes, same vegetables grown on agricultural soil irrigated with fresh canal water (SIFW), collected as control samples. A sample preparation method based on ultrasound-assisted pseudo-digestion (UASD) of soil, sewage sludge and vegetable samples in ultrasonic bath was developed. A conventional wet acid digestion method was used for comparison purposes. The EDTA-extractable metal in SIFW and SIDWS was also studied. The extracts and digests were analysed by flame atomic absorption spectrometer/electrothermal atomic absorption spectrometer (FAAS/ETAAS). Analytical results for six metals and metalloid by UASD in bath and conventional wet digestion methods showed a good agreement, thus indicating the possibility of using low mass and minimum quantity of digesting acid mixture in less time when compared with the conventional digestion method (CDM). The validation of the proposed UASD method was assessed by using certified reference materials BCR 483 and (whole meal flour) BCR 189. Recoveries ranging from 95.5 % to 102.3 % for understudied metals were obtained for different samples (soils and vegetables). The average relative standard deviation of UASD method varied between 2.3 % and 7.9 % for N ¼ 12, depending on the analyte. The vegetables grown in SIDWS showed high level of heavy metals when compared with control samples. This investigation highlights the increased danger of growing vegetables in the agricultural land, continuously irrigated and dressed with waste water and solid sewage sludge.

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“…The determination of trace element concentrations in pine needles has mainly been done by flame atomic absorption spectrometry (FAAS) [13], electrothermal atomic absorption spectrometry (ETAAS) [14][15][16], hydride generation atomic absorption spectrometry (HGAAS) [17,18] or inductively coupled plasma optical emission spectrometry (ICP-OES) [19][20][21][22][23][24] depending on the analyte elements and concentrations. Such instrumental technique as direct current plasma atomic emission spectrometer (DRC-AES) [25] has successfully been used in the analysis of selected element concentrations in pine needles.…”

Section: Introductionmentioning

confidence: 99%

Determination of mineral and trace element concentrations in pine needles by ICP-OES: evaluation of different sample pre-treatment methods

Väisänen

Laatikainen

Ilander

et al. 2008

International Journal of Environmental Analytical Chemistry

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

Cited by 14 publications

References 16 publications

Acid digestion of geological and environmental samples using open-vessel focused microwave digestion

Acid digestion of geological and environmental samples using open-vessel focused microwave digestion

Heavy Metal Contents of Vegetables Grown in Soil, Irrigated with Mixtures of Wastewater and Sewage Sludge in Pakistan, using Ultrasonic‐Assisted Pseudo‐digestion

Determination of mineral and trace element concentrations in pine needles by ICP-OES: evaluation of different sample pre-treatment methods

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