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Quality control of gasohol using a micro-unit for membraneless gas diffusion
Author(s)
Muncharoen, Sasithorn
Sitanurak, Jirayu
Tiyapongpattana, Warawut
Ratanawimarnwong, Nuanlaor
Motomizu, Shoji
Wilairat, Prapin
Nacapricha, Duangjai
Date Issued
January 1, 2009
Type
Article
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.
Citation
Microchimica Acta, 164(1-2), 203-210, 2009