Abstract
ABSTRACTThe long-term stability of dilute alcohol aqueous solutions used in breath alcohol testing was determined after approximately twenty-six years storage at room temperature. At each alcohol concentration, aliquots from four single-sealed polyethylene bottles containing 500 mL of solution at manufactured alcohol concentrations of 0.484, 2.420, 3.025, and 3.630 mg/mL, were analysed in triplicate by headspace gas chromatography. After twenty-six years storage, the mean percent changes (and ranges) were +4.4 (−6.5 to +8.3), +0.6 (−13.9 to +5.5), −2.0 (−15.6 to +3.5) and −26.3 (−39.1 to +3.9) for each concentration, respectively. The greatest percent loss in alcohol occurred in the alcohol standard at the highest concentration and decreased at the lower alcohol concentrations tested. Dilute aqueous alcohol solutions (of 3.035 mg/mL or less) show remarkable stability after long term storage at ambient temperatures.
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