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Making Sense of Smells A Guide for Understanding Farmstead Odors

Douglas W. Hamilton Waste Management Specialist Biosystems and Agricultural Engineering. Making Sense of Smells A Guide for Understanding Farmstead Odors. Part 5: Odor Intensity and Offensiveness. How does it smell? How Strong?. Charcter Intensity. Odor Measurement.

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Making Sense of Smells A Guide for Understanding Farmstead Odors

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

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

  3. Two Methods for Intensity • Referencing Suprathreshold • Descriptive Category Scale

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

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

  6. Referencing Suprathreshold Odor Intensity Odors are compared to standards of known intensity using dilutions of 1-Butanol CH3CH2CH2OH

  7. Referencing Suprathreshold Odor Intensity Port 1 2 3 4 5 6 7 8 www.rka-inc.com Purdue Agricultural Air Quality Laboratory

  8. Referencing Suprathreshold Odor Intensity Port vol/vol 1-butanol ppm 1 12 2 24 3 48 4 96 5 194 6 388 7 775 8 1,550 www.rka-inc.com Purdue Agricultural Air Quality Laboratory

  9. Referencing Suprathreshold Odor Intensity Port vol/vol 1-butanol ppm 1 12 2 24 3 48 4 96 5 194 6 388 7 775 8 1,550 www.rka-inc.com

  10. Referencing Suprathreshold Odor Intensity Port vol/vol 1-butanol ppm 1 12 2 24 3 48 4 96 5 194 6 388 7 775 8 1,550 www.rka-inc.com

  11. Referencing Suprathreshold Odor Intensity Port vol/vol 1-butanol ppm 1 12 2 24 3 48 4 96 5 194 6 388 7 775 8 1,550 www.rka-inc.com

  12. Referencing Suprathreshold Odor Intensity Results reported in ppm 1-butanol

  13. Referencing Suprathreshold Odor Intensity Port vol/vol 1-butanol ppm 1 12 2 24 3 48 4 96 5 194 6 388 7 775 8 1,550 www.rka-inc.com

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

  15. Referencing Suprathreshold Odor Intensity Results reported in ppm 1-butanol Log10Intensity = 2.02 ± 0.267 N = 12

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

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

  18. www2.dpi.qld.gov.au/environment

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

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

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

  22. Intensity vs Concentration www.library.thinkquest.org

  23. 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

  24. Intensity vs Offensiveness www.library.thinkquest.org

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

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

  27. How Bad? How Strong? Offensiveness Intensity Odor Measurement

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

  29. Offensiveness by Olfactometry • Equal Intensity samples are presented to panel.

  30. www2.dpi.qld.gov.au/environment

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

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

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

  34. Measuring Farmstead Odors

  35. Measuring Farmstead Odors

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