The attribute rating test for sensory analysis

Area of Science:

• Sensory Science
• Analytical Chemistry
• Environmental Monitoring

Background:

• Odorants in water sources, like geosmin, can cause customer complaints.
• Existing methods for odor evaluation may lack efficiency or standardization.
• A reliable method is needed to quantify odor intensity and assess treatment effectiveness.

Purpose of the Study:

• To introduce and validate a new sensory method for evaluating odorant intensity.
• To establish a standardized procedure for odor assessment in water treatment.
• To demonstrate the method's applicability in real-world monitoring scenarios.

Main Methods:

• Developed a modified paired-comparison format termed the attribute rating test.
• Trained individuals to compare sample odor intensity against a prepared standard.
• Utilized a rating scale: 'not detected,' 'less than,' 'equal to,' or 'greater than' the standard.

Main Results:

• The attribute rating test successfully trained individuals within an hour.
• The method accurately assessed odor intensity and type.
• Demonstrated effectiveness in monitoring geosmin levels and evaluating powdered activated carbon treatment at a water facility.

Conclusions:

• The attribute rating test provides a practical and efficient sensory method for odor evaluation.
• This method is applicable for monitoring known odorants with available standards.
• It aids in assessing the efficacy of water treatment processes for odor control.