Appendice
Olfactometric analysis or odor measurement by sensory analysis

Butanol measurements: dilution factors at the perception threshold obtained

• Results obtained: 19 to 174 ppb (reference value in prEN 13725 project: 40 ppb).

Butanol measurements: criteria obtained

• Participants: 19 laboratories, including 10 fc, 1 Afnor and 8 yes/no.

• Audit (mainly, verification of CEN calibration for the jury and olfactometer): 14 laboratories were "accepted" (including 9 fc, 0 Afnor because jury selection according to Afnor standard NF X 43-101 and 5 yes/no).

• Results: $r⩽\mathrm{0,477}$ criterion: 10 laboratories meet...