A reversed micellar extraction cycle is basically composed of
two steps: forward and back extraction. Therefore reverse micellar
extraction was performed at the optimized conditions after forward
and backward steps. The forward extraction process was performed
as follows: 5.0 mL of oil sample containing analytes was
poured into a screw-capped centrifuge tube and 1.0 mL of n-hexane
was added to decrease viscosity. 0.6 mg of Triton X-100 was
added to the oil sample and gently mixed for a few minutes until
a homogeneous phase was formed.