DIFFERENTIAL-PULSE POLAROGRAPHIC-DETERMINATION OF DICROTOPHOS, CROTOXYPHOS AND CHLORFENVINPHOS IN GRAINS AND SOILS

A simple, sensitive and rapid differential pulse polarographic method has been developed for the quantitative determination of organophospho rus pesticides such as dicrotophos, crotoxyphos and chlorfenvinphos in agricultural formulations in universal buffers of a pH range 2.0-12.0 . The sample is treated with ethanol to facilitate the dissolution of these pesticides. Both standard addition and calibration methods can b e used for the analyses. The lower detection limits are 1.25 x 10(-9), 1.05 x 10(-9) and 1.0 x 10(-9) M, respectively. The method can be app lied successfully to determination of these pesticides in grains and s oil. (C) 1997 Elsevier Science B.V.