![[SRC-133] Thresholds and concentration (PDF sheet 143)](https://images.spr.so/cdn-cgi/imagedelivery/j42No7y-dcokJuNgXeA0ig/f9faaa5a-12e7-445b-ab82-4c95c0f0f700/attachment-4c9836e8-5dbd-420f-8f7b-ee710b211b04-us_whiskey_academy/w=1920,quality=90,fit=scale-down)
Thresholds depend on matrix, method, and person; values cannot be transferred uncritically into whiskey.
The chapter defines threshold and explains why low-abundance compounds may be important.
Odorants differ enormously in detection and recognition thresholds, so concentration rank alone cannot determine which compounds matter to perception.
PDF sheet 143
Thresholds and concentration
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September28 fresh review qualification
PDF143 introduces the threshold argument; table6.1 and examples are on144. The table lacks matrix/method conditions and16000/40 gives400, not the text's375. Lower threshold does not alone establish perceived intensity at every concentration. Preserve the qualitative distinction between chemical abundance and sensory contribution; do not transfer these values to whiskey. Full review: 