A HP model 6890 GC, interfaced to a HP 5791A
mass selective detector (GC/MS), was used for mass
spectral identification of the GC components at MS ionization
voltage of 70 eV. A 30 m0.25 mm i.d. (df=0.25
mm) DB-WAX bonded-phase fused-silica capillary column
(J & W Scientific, Folsom, CA) was used for a GC.