The correlation between odor concentration and pollutants iscomplementary to the olfactometric analysis.
The phases of the activities areas follows:
- Collection of the odorigene samples in parallel with the chemical sampling;
- Analysis of both chemical and olfactometric samples;
- Comparison of the chemical concentration values with the olfactory perception thresholds present in the literature;
- Determination of synergy-masking reactions between different compounds in odor formation.
A starting point for the comparison between the results of chemicalanalyzes and the olfactory perception thresholds is represented in Table 2 ofAnnex 4 of Legislative Decree no. February 15th 2012 - n. IX / 3018"General determinations regarding the characterization of gaseousemissions into the atmosphere from activities with a strong odor impact",which is based on the "Measurement of Odor Threshold by Triangle Odor BagMethod" study by Yoshio Nagata of the Japan Enviromental Sanitation Center.
The compounds to be considered depend on the type of implant under examination. The most common classes of compounds are: COT, VOC, IPA and mercaptans.