Abstract
Fifteen urea pesticides have been separated on RP-18WF 254 plates with methanol-water and mixed organic (acetonitrile-methanol, 1:1 v/v )-0.1% aqueous orthophosphoric acid (H 3 PO 4 ) mobile phases (RP-HPTLC), and on silica gel 60F 254 plates with benzene-methanol and benzene-ethanol mobile phases (NP-TLC). The pesticides could be classified into three groups: monolinuron (1), chlorotoluron (2), diuron (3), isoproturon (4), and linuron (5) dimefuron (6), diflubenzuron (7), teflubenzuron (8), and lufenuron (9); and thifensulfuron methyl (10), triasulfuron (11), chlorsulfuron (12), rimsulfuron (13), amidosulfuron (14), and tribenuron methyl (15). Relationships between R F values and mobile phase composition were determined for the pesticides. Δ R F values, separation factors ( α ), and constants for separation of pairs of compounds ( R F α ) were used to determine optimum chromatographic conditions for the separations. Comparison of results from normal and reversed-phase TLC revealed the pesticides in the f...
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