Simultaneous Determination of Atrazine and Chlorpyrifos in Pesticide Formulations, in Soils and Waters by Derivative Spectrophotometry and Ratio Spectra Derivative

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Abstract
A new method is described to analyse a binary mixture of atrazine and chlorpyrifos, using first-derivative spectrophotometry for atrazine and first derivative of the ratio spectra for chlorpyrifos. The procedure does not require any separation step. Calibration graphs were linear up to 15 μg.mL−1 of atrazine and to 10 μg.mL−1 of chlorpyrifos. The method has been applied to determine both compounds in pesticide formulations, in soils and waters.