An Agilent model 6890 GC equipped with a 30 m × 0.25 mm i.d. (df = 0.5 μm) DB-WAX bonded-phase fused-silica capillary column (Agilent, Folsom, CA) and a flame ionization detector (FID) was used for measurement of KI and routine analysis of volatile chemicals. A 30 m × 0.25 mm i.d. (df = 0.5 μm) DB-1 bonded-phase fused-silica capillary column was also used
for measurement of KI.