A gas chromatography-mass spectrometer
(GC-MS, Trace GC/Polaris Q, U.S.A.) with a DB5-MS
Capillary column (30 m x 0.32 mm I.D.) equipped with an
ion trap detector was used. The GC condition was as
follows: injector, 280°C; detector, 280°C; the column
was initially at 50°C for 1 min and then programmed at
15°C min-1 to 300°C and held for 5 min. The carrier gas
(He) flow rate was 1 ml/min.
Apersonal air sampler (GILAIR5, Gillian, NJ,
USA) was also used.