Improvement of odor intensity measurement using dynamic olfactometry.

Area of Science:

• Environmental Science
• Analytical Chemistry
• Sensory Science

Background:

• Odor intensity and concentration are key metrics for assessing odor pollution.
• Previous methods faced challenges in reliability and standardization.
• Digital olfactometers offer potential for improved odor measurement accuracy.

Purpose of the Study:

• To report significant improvements in experimental procedures for odor concentration-intensity (OCI) relationships.
• To validate a newly developed digital olfactometer against VDI guideline 3882.1 and EN13725 standards.
• To establish reliable odor measurement techniques for industrial and environmental applications.

Main Methods:

• Utilized a newly developed, automatically calibrated digital olfactometer.
• Implemented procedures to eliminate cross-contamination and ensure random odor presentation.
• Employed stringent panelist screening and performance monitoring.
• Applied the DynaScent calculation method alongside traditional VDI methods.

Main Results:

• The digital olfactometer demonstrated high accuracy and repeatability in dilution ratios.
• Cross-contamination was effectively eliminated, enabling random odor presentation.
• Distinct Odor Concentrations (DOCs) for refinery and wastewater odors were determined (3.8-15.4 OU/m³ and 4.2-15.6 OU/m³, respectively).
• No significant differences were found between VDI and DynaScent calculation methods.

Conclusions:

• The improved experimental procedures and digital olfactometer are critical for reliable odor intensity measurement.
• The findings support the development of quantitative odor impact criteria for various industries.
• Accurate odor measurement facilitates better environmental management and regulatory compliance.