Table III. Conditions for themodifiedSPE extraction of
Paraquat andDiquat.
Tube dried for less than 30 seconds
Dry
Sample passed through tubeat 20-25mL/min flow rate
Sample flow
rate
Inner surface of tube rinsedwith small amount of deionizedwater
Wash
1L samplewater
Sample
1.
4mL acetonitrile
2.
4mLdeionizedwater
Tube
conditioning
6mL, 500mgUltraQuat SPE
SPE tube
