The pH of the sample solution is an important factor affecting
the absorbance of the sedimented phase. Thus DLLME procedure
for carbendazim was performed in the solutions with different pH
values ranging from 1.0 to 7.0. The results shown in Fig. 4 indicated
that the signal intensity of the phase was nearly constant at pH
values between 2.0 and 4.0 and decreased at higher pH values.
Thus, pH 3.0 was chosen for DLLME of carbendazim in the further