Diuron concentrations were determined using an Agilent 1100
series HPLC equipped with a diode array detector and C18 column.
The operating conditions for diuron were: Apollo C18 cartridge
(250 mm 4.6 mm I.D., 5 lm particle size); isocratic elution at a
flow rate of 1.0 mL min1
; injection volume of 20 lL; mobile phase
of acetonitrile: water 60: 40; UV detection at a wavelength of
220 nm. The retention time for diuron was noted to be 6.2 min
with a minimum detection limit of 0.04 mg L1
.