n-butanol

n-butanol

is the reference material outlined in the EN13725 standard.  One of the criteria in order to become an assessor, is to be able to detect n-butanol between 20ppb to 80ppb by volume with a target of 40ppb (0.040 µmol/mol).  This is based on the assumption that a physiological response at the detection threshold of an odorant is equivalent to that of the reference material.

1 EROM ≡ 123 µg of n-butanol ≡ 1 OUE for mixture of odorants

n-butanol was selected in the EN13725 standard due to its history of usage and availability of metrological infrastructure.  It is preferred to use a reference mixture of components as research demonstrates better repeatability limit for mixtures versus single components.  [2]

European Reference Odour Mass (EROM)

It represents the mass of a substance evaporated into 1m3 of neutral gas at standard conditions that will elicit an olfactory response in 50% of the panel.  One EROM is equivalent to one European odour unit/m3.

1 EROM ≡ 123 µg of n-butanol ≡ 1 OUE for mixture of odorants

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