olfactometry analysis

EN 13725 – YES/NO Mode

The assessor is asked to evaluate gas presented from a specific port and to indicate if an odour is perceived ( YES/NO). The assessor is aware that in some cases…

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EN 13725 – Forced Choice Mode

The assessor is presented with two or more ports, of which one presents the stimulus and the other(s) neutral gas.The location of the stimulus in consecutive presentation is randomly distributed…

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Exposure

Exposure is a combination of the amount of a pollutant in the air and the amount of time that person stays in the presence of a pollutant. Exposure determines the…

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Neutral gas

Gas (air or nitrogen) not having any odour that would interfere with olfactometry measurement.  Clean odourless air is used during an olfactometry analysis.  Activated carbon filters may be used to…

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Odorant

A substance capable of eliciting an olfactory response. It is simply something that has a distinctive smell. Odorants come in all variations and can be used as a safety precaution…

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Olfactometry

The process of analyzing the responses of odour(s) using human subjects (assessors).  The responses can be used to determine the odour concentration or odour intensities or hedonic tone of the…

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Particulate Matter (PM)

Tiny solid or liquid particles that are suspended in air. Particulate matter is produced from a wide variety of sources like natural and human-caused, large and small. They are comprised…

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Step factor

A factor which is used to calculate proceeding dilutions during olfactometry analysis.  A ratio of the current dilution to the step factor calculates the next dilution in the dilution series….

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