Publication: Quality control of gasohol using a micro-unit for membraneless gas diffusion
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Issued Date
2009
Resource Type
File Type
application/pdf
ISSN
263672
Other identifier(s)
2-s2.0-58149471077
Rights Holder(s)
Scopus
Bibliographic Citation
Microchimica Acta. Vol 164, (2009), p.203-210
Suggested Citation
Muncharoen S., Sitanurak J., Tiyapongpattana W., Choengchan N., Ratanawimarnwong N., Motomizu S., Wilairat P., Nacapricha D. Quality control of gasohol using a micro-unit for membraneless gas diffusion. Microchimica Acta. Vol 164, (2009), p.203-210. doi:10.1007/s00604-008-0058-6 Retrieved from: https://hdl.handle.net/20.500.14740/7714
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.