Comparison between ultrasound assisted extraction and microwave digestion in the determination of arsenic in edible grains.
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Date
2017
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Abstract
A comparative evaluation of arsenic extraction from grains using ultrasound assisted extraction
(UAE) and microwave digestion (MW) was developed. The arsenic determination was carried
out using hydride generation coupled to flame atomic absorption spectroscopy (HG-FAAS). The
optimal extraction condition indicated for corn was 20% v v-1 of HCl, temperature of 67 °C and
sonication time of 30 min. For bean, the optical condition was HNO3 in a 10% v v-1, temperature
of 25 °C and sonication time of 10 min and for soybean it was 30% v v-1 HCl, temperature of
60 °C and time of 10 min. Recovery studies close to 100% in the extraction of spiked samples
was achieved. The results obtained were compared with two common extraction methods for
arsenic using microwave digestion and the developed methods showed a significant increase in
the arsenic recovery from the samples. In the real samples it was found an arsenic concentration
of 0.3 μg g-1. The developed methods proved to be efficient at extracting the arsenic present in the
studied grains, being appropriate to evaluate the risk to human consumption.
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Keywords
Arsenic, Hydride generation, Ultrasound assisted extraction, Grains
Citation
RIBEIRO, R. V. et al. Comparison between ultrasound assisted extraction and microwave digestion in the determination of arsenic in edible grains. Journal of The Brazilian Chemical Society, v. 29, p. 873-880, 2017. Disponível em: <http://jbcs.sbq.org.br/imagebank/pdf/2017-0341SR.pdf>. Acesso em: 05 abr. 2018.