Determination of ethanol in distilled liquors using sequential injection analysis with spectrophotometric detection

Philip J. Fletcher, Jacobus F. Van Staden

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

A sequential injection analysis method using spectrophotometric detection has been developed for the determination of ethanol in spirit samples. Low-cost reagents (0.2M potassium dichromate and 4M sulphuric acid) are used, and reagent usage is minimal (200μl per analysis). The system is fully automated using software written in LabVIEW™. The method is linear up to 6% (v/v) (R2=0.9995) with a detection limit of 0.09% (v/v). RSDs (n=10) are <1% in the range 1-6% (v/v) and the sample throughput is 19samplesh -1. Measured results for commercial spirit samples were in excellent agreement with their advertised ethanol strengths.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalAnalytica Chimica Acta
Volume499
Issue number1-2
Early online date3 Oct 2003
DOIs
Publication statusPublished - 4 Dec 2003

Keywords

  • Alcohol
  • Distilled liquors
  • Ethanol
  • Potassium dichromate
  • Sequential injection analysis
  • Spectrophotometry
  • Spirits

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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