Ultrasound assisted pseudo-digestion for determination of iron and manganese in citric acid fermentation mediums by electrothermal atomic absorption spectroscopy |
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Authors: | Alireza Pourhossein Masoud Madani Mohsen Shahlaei Kambiz Fakhri Parisa Alimohamadi Maryam Amiri |
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Institution: | (1) Research and Development Center, Kimia Gharb Gostar Industrial Company, 17136-94881 Kermanshah, Iran;(2) Department of Chemistry, Faculty of Science, Varamin-Pishva Branch, Islamic Azad University, 16417-66813 Varamin, Iran;(3) Department of Pharmaceutical Chemistry, Isfahan University of Medical Science, 81746-73461 Isfahan, Iran;(4) Department of Medicinal Chemistry, School of Pharmacy, Kermanshah University of Medical Sciences, 67346-67149 Kermanshah, Iran |
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Abstract: | A sensitive, simple and rapid method for ultra-trace determination of iron and manganese based on ultrasound assisted pseudodigestion
in citric acid fermentation medium samples (beet and cane molasses and raw sugar based mediums) is described. Parameters influencing
pseudo-digestion, such as sonication time, sample mass and solvent system were fully optimized. Final solutions obtained upon
sonication were analyzed by electrothermal atomic absorption spectrometry (ETAAS). The best conditions for metal pseudo-digestion
were as follows: a 25, 30 and 20 min sonication time for beet molasses, cane molasses and raw sugar based medium samples,
respectively, 0.7 g sample mass of raw sugar based samples, 0.5 g sample mass of molasses based samples and an extraction
mixture of concentrated HNO3-H2O2, in 25 mL of solvent. Analytical results obtained for the two metals by ultrasound assisted pseudo-digestion and conventional
wet digestion methods showed a good agreement. This method reduces the time required for all treatments (heating to dryness,
cooling and separation) in comparison with conventional wet digestion method. The accuracy of the method was tested by comparing
the obtained results with that of conventional wet digestion method.
![MediaObjects/11532_2009_20_Fig1_HTML.jpg](/content/a6362130871q11m0/MediaObjects/11532_2009_20_Fig1_HTML.jpg) |
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Keywords: | Ultrasound assisted-digestion Iron Manganese ETAAS Citric acid fermentation mediums |
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