|
|||||
|
|
A membraneless gas diffusion unit: design and its application to determination of ethanol in liquors by spectrophotometric flow injection |
|
| Authors: | Choengchan N Mantim T Wilairat P Dasgupta P K Motomizu S Nacapricha D |
| Institution: | a Flow Innovation-Research for Science and Technology Laboratories, Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand b Department of Chemistry, Faculty of Science, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8530, Japan c Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA |
| Abstract: | This work presents new design of a gas diffusion unit, called ‘membraneless gas diffusion (MGD) unit’, which, unlike a conventional gas diffusion (GD) unit, allows selective detection of volatile compounds to be made without the need of a hydrophobic membrane. A flow injection method was developed employing the MGD unit to determine ethanol in alcoholic drinks based on the reduction of dichromate by ethanol vapor. Results clearly demonstrated that the MGD unit was suitable for determination of ethanol in beer, wine and distilled liquors. Detection limit (3S/N) of MGD unit was lower than the GD unit (GD: 0.68%, v/v; MGD: 0.27%, v/v). The MGD design makes the system more sensitive as mass transfer is more efficient than that of GD and thus, MGD can perfectly replace membrane-based designs. |
| Keywords: | Membraneless gas diffusion Flow injection Ethanol determination Liquor Spectrophotometry |
| 本文献已被 ScienceDirect PubMed 等数据库收录！ | |