Publication: Membraneless vaporization unit for direct analysis of solid sample
Issued Date
2007-07-30
Resource Type
ISSN
00032670
Other identifier(s)
2-s2.0-34447503853
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Mahidol University
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SCOPUS
Bibliographic Citation
Analytica Chimica Acta. Vol.597, No.1 (2007), 157-162
Suggested Citation
K. Sereenonchai, P. Saetear, N. Amornthammarong, K. Uraisin, P. Wilairat, S. Motomizu, D. Nacapricha Membraneless vaporization unit for direct analysis of solid sample. Analytica Chimica Acta. Vol.597, No.1 (2007), 157-162. doi:10.1016/j.aca.2007.06.036 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/24159
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Title
Membraneless vaporization unit for direct analysis of solid sample
Abstract
A new apparatus, called 'membraneless vaporization' (MBL-VP) unit was designed and developed for direct analysis of solid samples. Solid analyte was converted into a gaseous form which then reacts with an indicator reagent. Change in absorbance was used to quantitate the analyte. Stirring with a magnetic bar was employed to facilitate the evaporation of the gas. Unlike the pervaporation technique, hydrophobic membrane was not required for this MBL-VP technique. Application of the membraneless technique for direct determination of calcium carbonate in calcium supplements, has shown to be very precise (R.S.D. = 2.5% for 0.16 mmol CO32-), with detection limit of 0.5 mg CaCO3. Results by this method agreed well with flame atomic absorption spectrometric method. Sample throughput was 20 samples h-1. © 2007 Elsevier B.V. All rights reserved.