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Title: Quality control of gasohol using a micro-unit for membraneless gas diffusion
Authors: Sasithorn Muncharoen
Jirayu Sitanurak
Warawut Tiyapongpattana
Nathawut Choengchan
Nuanlaor Ratanawimarnwong
Shoji Motomizu
Prapin Wilairat
Duangjai Nacapricha
Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs.)
Mahidol University
King Mongkut's Institute of Technology Ladkrabang
Srinakharinwirot University
Okayama University
Keywords: Chemistry
Issue Date: 1-Jan-2009
Citation: Microchimica Acta. Vol.164, No.1-2 (2009), 203-210
Abstract: This work describes the development of a new spectrophotometric flow technique suitable for monitoring of ethanol content in gasohol fuel. Membraneless gas-diffusion (MBL-GD) was applied with one-step aqueous extraction of gasohol (1:2 gasohol/water). Segments of aqueous extract and color developing reagent were allowed to flow into two separate channels in the MBL-GD device. Inside the device, ethanol vapor can diffuse across a small headspace between the two channels (donor and acceptor). Introduction of an air-segment behind the zone of acceptor reagent to stop dispersion of the colored zone greatly improves the rapidity of analysis using this MBL-GD technique. Two methods were developed for quality control of gasohol by measuring ethanol content. Method I is suitable for direct calibration of E5 and E10. Method II is recommended for E20. These methods have high accuracy with good precision (% RSD: 1 to 4.9, n=45) and have a sample throughput of 26 samples per hour. E10 samples were compared with analysis using a standard GC method. © 2008 Springer-Verlag.
ISSN: 14365073
Appears in Collections:Scopus 2006-2010

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