Fig. 3. Relationship between total ion current (IC) bound to the solid phase microextraction (SPME) fiber for cattle C1 and swine S2 feces and (A) the time of fiber exposure to the air stream leaving the dynamic flux chamber [flow rate = 1 L min^–1 (16 cm s^–1); chamber temperature = 20°C] or (B) air flow rate leaving the chamber [fiber exposure time = 5 min; chamber temperature = 20°C].