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Table 1 Levels of trace volatile compounds in alveolar and oral air.

From: Sub-parts per billion detection of trace volatile chemicals in human breath using Selected Ion Flow Tube Mass Spectrometry

Sample Compartment Indole Methylindole Hydrogen Sulphide Methylmercaptan
Ambient NA 0.4 0 0.4 4
Subject 1 Alveolar 1.7 0.4 10 10
  Oral 2.4 0.8 48 71
Subject 2 Alveolar 2.2 0.4 9.2 9.4
  Oral 3.2 0.9 23 44
Subject 3 Alveolar 1.1 0.9 11 4.3
  Oral 1.7 1.2 41 38
  1. Levels of indole, methylindole (all isomers), hydrogen sulphide and methylmercaptan were measured in ambient air, or in a single alveolar breath or static oral air (approximately 10 second measurement duration) of 3 healthy human subjects by SIFT-MS using characteristic products ions of the reaction with H3O+ precursors. Values are in PPBV. NA: not applicable.