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ID 33033
FullText URL
Author
Muncharoen, Sasithorn
Sitanurak, Jirayu
Tiyapongpattana, Warawut
Choengchan, Nathawut
Ratanawimarnwong, Nuanlaor
Motomizu, Shoji
Wilairat, Prapin
Nacapricha, Duangjai
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.

Keywords
embraneless gas diffusion
Flow-based
Ethanol
Gasohol
Note
Published with permission from the copyright holder.
This is published in Microchimica Acta, 2008 online first
Publisher URL: http://dx.doi.org/10.1007/s00604-008-0058-6

(C)2008 by Springer
Published Date
2008-05-17
Publication Title
Microchimica Acta
Volume
volume164
Issue
issue1
Publisher
Springer Vienna
Start Page
203
End Page
210
ISSN
0026-3672
NCID
AA00738769
Content Type
Journal Article
language
英語
Refereed
True
DOI
Web of Sience KeyUT
Submission Path
analytical_chemistry/49