A Comparative Analysis of Volatile Organic Compounds Using a Fuel Cell Based Breathalyzer (LifeLocFC20)
Faculty Mentor Information
Dr. Tim Anstine, Northwest Nazarene University
Presentation Date
7-15-2026
Abstract
Fuel cell-based alcohol breathalyzers are widely used instruments for detecting and quantifying ethanol concentrations in human breath. However, the extent to which other volatile organic compounds (VOCs) produce measurable responses remains an important analytical consideration. This study analyzed the response of a fuel cell-based breathalyzer (LifeLoc FC20) to multiple VOCs, including methanol, 1-propanol, 2-propanol, 1-butanol, 1-pentanol, propylamine, propanal, butanal, acetone, and tert-butanol. All tests solutions were analyzed using a 500mL total volume of distilled water and the VOCs mass equivalent to the molar amount (0.01064 mol) corresponding to a theoretical breath alcohol concentration of 0.080 g/210 L ethanol. A breath simulator (ALCOSIM) maintained the solutions temperature at 34C, to approximate exhaled breath conditions, and delivered vapor to two independently calibrated LifeLoc FC20 instruments. All trials were performed in three series of triplicates; between each triplicate a 0.080 g/210 L wet-bath standard verification was conducted. Instruments were recalibrated if wet-check values deviated by more than ±0.005 g/210 L from the target value (0.080 g/210 L). Results demonstrated that the LifeLoc FC20 had measurable readings for a variety of volatile organic compounds beyond ethanol. Although response magnitude varied substantially among the VOCs tested, numerous VOCs produced apparent breath alcohol readings. The findings indicated that fuel cell-based alcohol breathalyzer possesses measurable sensitivity to multiple VOCs and that molecular structure plays a significant role in determining the extent of fuel cell oxidation and resulting instrument response.
A Comparative Analysis of Volatile Organic Compounds Using a Fuel Cell Based Breathalyzer (LifeLocFC20)
Fuel cell-based alcohol breathalyzers are widely used instruments for detecting and quantifying ethanol concentrations in human breath. However, the extent to which other volatile organic compounds (VOCs) produce measurable responses remains an important analytical consideration. This study analyzed the response of a fuel cell-based breathalyzer (LifeLoc FC20) to multiple VOCs, including methanol, 1-propanol, 2-propanol, 1-butanol, 1-pentanol, propylamine, propanal, butanal, acetone, and tert-butanol. All tests solutions were analyzed using a 500mL total volume of distilled water and the VOCs mass equivalent to the molar amount (0.01064 mol) corresponding to a theoretical breath alcohol concentration of 0.080 g/210 L ethanol. A breath simulator (ALCOSIM) maintained the solutions temperature at 34C, to approximate exhaled breath conditions, and delivered vapor to two independently calibrated LifeLoc FC20 instruments. All trials were performed in three series of triplicates; between each triplicate a 0.080 g/210 L wet-bath standard verification was conducted. Instruments were recalibrated if wet-check values deviated by more than ±0.005 g/210 L from the target value (0.080 g/210 L). Results demonstrated that the LifeLoc FC20 had measurable readings for a variety of volatile organic compounds beyond ethanol. Although response magnitude varied substantially among the VOCs tested, numerous VOCs produced apparent breath alcohol readings. The findings indicated that fuel cell-based alcohol breathalyzer possesses measurable sensitivity to multiple VOCs and that molecular structure plays a significant role in determining the extent of fuel cell oxidation and resulting instrument response.