Determination of ethanol in liquor by near-infrared spectrophotometry with flow injection
A simple procedure for the determination of ethanol in a liquor by near-infrared (NIR) spectrophotometry with flow injection (FI) is proposed. A liquor sample is equilibrated off-line with dried chloroform to extract ethanol into the organic phase. The extract is injected into a carrier stream of dr...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
2014
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| Online Access: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0035896196&partnerID=40&md5=48e3689873de7a05e48109cc7ec16910 http://www.ncbi.nlm.nih.gov/pubmed/18968213 http://cmuir.cmu.ac.th/handle/6653943832/5024 |
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| Institution: | Chiang Mai University |
| Language: | English |
| Summary: | A simple procedure for the determination of ethanol in a liquor by near-infrared (NIR) spectrophotometry with flow injection (FI) is proposed. A liquor sample is equilibrated off-line with dried chloroform to extract ethanol into the organic phase. The extract is injected into a carrier stream of dried chloroform passing through a home-made flow through cell (1 mm path length) sitting in a NIR spectrophotometer for continuous monitoring of absorbance at 2305 or 2636 nm. The ethanol content can be evaluated from a calibration established by a plot of change in absorbance versus concentration of ethanol standard solutions. Optimization of the system will be discussed. A calibration is linear in the range of 20-50% (v/v) ethanol. A throughput of 240 injections h-1 can be obtained. The procedure is validated by comparing the results with an analysis using gas Chromatography. © 2001 Elsevier Science B.V. |
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