Chlorinated pesticides

sample/matrix

200 ppt each in 2 mL water

SPME fiber

polydimethylsiloxane, 100 μm (57300-U)

extraction

15 min immersed in water with rapid stirring

column

SPB-5, 15 m × 0.20 mm I.D., 0.20 μm (24165-U)

oven

120 °C (1 min) to 180 °C at 30 °C/min, then to 290 °C at 10 °C/min

inj. temp.

260 °C (splitless - closed 3 min)

detector

ECD, 300 °C

carrier gas

helium, 37 cm/sec (set at 120 °C)