The results show that the extraction and derivatization time has
no significant effect on the extraction efficiency. It is revealed
that after formation of cloudy solution, the surface area between
extraction solvent and aqueous phase (water sample) is infinitely
large. Thereby, derivatization of CPs with acetic anhydride and
their transition from aqueous phase (water sample) to extraction
solvent is fast enough to let a quick achieve of the equilibrium
state. As a result the extraction and derivatization time is very
short.