Two groups of the selected pesticides were investigated: 1st group-monolinuron (1), chlorotoluron (2), diuron (3), isopro-turon (4), linuron (5); and 2nd group-dimefuron (6), difluben-zuron (7), teflubenzuron (8), and lufenuron (9). The retention times (t_R), the peak resolutions (R_s), and the separation factors (a) indicate that the mobile phases containing 55% and 85% methanol in water are the best for separations of first and second groups of investigated pesticides, respectively.
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