DETERMINATION OF CYPERMETHRIN, FENVALERATE AND CIS-PERMETHRIN AND TRANS-PERMETHRIN IN SOIL AND GROUNDWATER BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY USING PARTIAL LEAST-SQUARES REGRESSION

The partial least-squares (PLS-2) method was applied to the simultaneo us determination of the pyrethroids cypermethrin, fenvalerate and cis- trans-permethrin by HPLC. The PLS-2 method was also applied to the res olution of the ternary mixtures of cypermethrin, fenvalerate and trans -permethrin, cis-permethrin being determined from a calibration graph. The results obtained were compared and the best solution was applied to determine the four pyrethroids in soil and groundwater samples