GC Analysis of a 7-Component Organochlorine Pesticide Mix in Drinking Water on a 5% Phenyl Column after SPE using Supelclean^™ ENVI^™-18

sample preparation

SPE (Solid Phase Extraction)

sample/matrix

drinking water spiked with pesticides

SPE tube/cartridge

Supelclean ENVI-18, 500 mg/6 mL (57064)

condition

2 x 6 mL hexane:ethyl ether (1:1); 6 mL methanol; 6 mL DI water

sample addition

250 mL water sample at 10 mL/min

drying

10 min with vacuum

elution

2 x 15 mL hexane:ethyl ether (1:1)

eluate post-treatment

concentrate to 2 mL with nitrogen stream

column

5% Phenyl Polysiloxane, 30 m × 0.25 mm I.D., 0.25 μm (Supelco equivalent, Equity-5, 28089-U)

oven

150 °C (2 min), 10 °C/min to 275 °C

detector

ECD, 310 °C

carrier gas

helium

injection

1 μL