Membraneless vaporization unit for direct analysis of solid sample

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 mag...

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Published inAnalytica chimica acta Vol. 597; no. 1; pp. 157 - 162
Main Authors Sereenonchai, K., Saetear, P., Amornthammarong, N., Uraisin, K., Wilairat, P., Motomizu, S., Nacapricha, D.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 30.07.2007
Elsevier
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Summary: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 CO 3 2−), with detection limit of 0.5 mg CaCO 3. Results by this method agreed well with flame atomic absorption spectrometric method. Sample throughput was 20 samples h −1.
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ISSN:0003-2670
1873-4324
DOI:10.1016/j.aca.2007.06.036