Making Sense of Smells A Guide for Understanding Farmstead Odors Part 5: Odor Intensity and Offensiveness Douglas W. Hamilton Waste Management Specialist.

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Presentation transcript:

Making Sense of Smells A Guide for Understanding Farmstead Odors Part 5: Odor Intensity and Offensiveness Douglas W. Hamilton Waste Management Specialist Biosystems and Agricultural Engineering

Odor Measurement How does it smell? How Strong? Charcter Intensity

Two Methods for Intensity 1.Referencing Suprathreshold 2.Descriptive Category Scale

Referencing Suprathreshold Odor Intensity Odors are compared to standards of known intensity

Odors are compared to standards of known intensity using dilutions of 1-Butanol Referencing Suprathreshold Odor Intensity

Odors are compared to standards of known intensity using dilutions of 1-Butanol CH 3 CH 2 CH 2 OH Referencing Suprathreshold Odor Intensity

Port Purdue Agricultural Air Quality Laboratory Referencing Suprathreshold Odor Intensity

Port vol/vol 1-butanol ppm ,550 Purdue Agricultural Air Quality Laboratory Referencing Suprathreshold Odor Intensity

Port vol/vol 1-butanol ppm ,550 Referencing Suprathreshold Odor Intensity

Port vol/vol 1-butanol ppm ,550 Referencing Suprathreshold Odor Intensity

Port vol/vol 1-butanol ppm ,550 Referencing Suprathreshold Odor Intensity

Results reported in ppm 1-butanol Referencing Suprathreshold Odor Intensity

Port vol/vol 1-butanol ppm ,550 Referencing Suprathreshold Odor Intensity

Results reported in ppm 1-butanol Intensity = 105 ppm 1-butanol Referencing Suprathreshold Odor Intensity

Results reported in ppm 1-butanol Log 10 Intensity = 2.02 ± N = 12 Referencing Suprathreshold Odor Intensity

Descriptive Scale Odor Intensity Panel rates Intensity on a scale independent of an external standard

1.Dilutions of odor are presented to panel. Descriptive Scale Odor Intensity

www2.dpi.qld.gov.au/environment

1.Dilutions of odor are presented to panel. 2.Panelists rate odor intensity on a descriptive scale. Descriptive Scale Odor Intensity

Intensity Scale 0 = no odor 1 = very faint 2 = faint 3 = distinct 4 = strong 5 = very strong 6 = extremely strong

1.Dilutions of odor are presented to panel. 2.Panelists rate odor intensity on a descriptive scale. 3.Statistics are performed to determine consensus of the panel. Descriptive Scale Odor Intensity

Intensity vs Concentration

Measured Swine Odor Relationship 6 = Extremely strong 5 = Very Strong 4 = Strong 3 = Distinct 2 = Faint 1 = Very Faint 0 = No Odor Misselbrook, et al. 1993

Intensity vs Offensiveness

Odor Measurement How does it smell? How Strong? Charcter Intensity

Odor Measurement How Good or Bad? How Strong? Hedonic Tone Intensity

Odor Measurement How Bad? How Strong? Offensiveness Intensity

Offensiveness is an Intrinsic Property of an Odor A odor will be equally offensive, no matter how strong.

Offensiveness by Olfactometry 1.Equal Intensity samples are presented to panel.

www2.dpi.qld.gov.au/environment

Offensiveness by Olfactometry 1.Equal Intensity samples are presented to panel 2.Panel rates offensiveness on a descriptive scale.

Offensiveness Scale 0 = Inoffensive 1 = Very faintly Offensive 2 = Faintly Offensive 3 = Definitely Offensive 4 = Strongly Offensive 5 = Very Strongly Offensive 6 = Extremely Offensive

Offensiveness by Olfactometry 1.Equal Intensity samples are presented to panel 2.Panel rates offensiveness on a descriptive scale. 3.Statistics are performed to determine consensus of the panel.

NotesOdors Character Verbal DescriptionOffensiveness Persistence Top Note Middle Note Base Note Concentration Detection Level Recognition Level OU Intensity Measuring Farmstead Odors

NotesOdors Character Verbal DescriptionOffensiveness Persistence Top Note Middle Note Base Note Persistency Concentration Detection Level Recognition Level OU Intensity Measuring Farmstead Odors