start-ver=1.4 cd-journal=joma no-vol=164 cd-vols= no-issue=1 article-no= start-page=203 end-page=210 dt-received= dt-revised= dt-accepted= dt-pub-year=2008 dt-pub=20080517 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Quality control of gasohol using a micro-unit for membraneless gas diffusion en-subtitle= kn-subtitle= en-abstract= kn-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.

en-copyright= kn-copyright= en-aut-name=MuncharoenSasithorn en-aut-sei=Muncharoen en-aut-mei=Sasithorn kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SitanurakJirayu en-aut-sei=Sitanurak en-aut-mei=Jirayu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TiyapongpattanaWarawut en-aut-sei=Tiyapongpattana en-aut-mei=Warawut kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=ChoengchanNathawut en-aut-sei=Choengchan en-aut-mei=Nathawut kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=RatanawimarnwongNuanlaor en-aut-sei=Ratanawimarnwong en-aut-mei=Nuanlaor kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=WilairatPrapin en-aut-sei=Wilairat en-aut-mei=Prapin kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=NacaprichaDuangjai en-aut-sei=Nacapricha en-aut-mei=Duangjai kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= affil-num=1 en-affil= kn-affil=Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs) affil-num=2 en-affil= kn-affil=Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs) affil-num=3 en-affil= kn-affil=Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs) affil-num=4 en-affil= kn-affil=Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs) affil-num=5 en-affil= kn-affil=Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs) affil-num=6 en-affil= kn-affil=Department of Chemistry, Faculty of Science, Okayama University affil-num=7 en-affil= kn-affil=Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs) affil-num=8 en-affil= kn-affil=Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs) en-keyword=embraneless gas diffusion kn-keyword=embraneless gas diffusion en-keyword=Flow-based kn-keyword=Flow-based en-keyword=Ethanol kn-keyword=Ethanol en-keyword=Gasohol kn-keyword=Gasohol END