Abstract
Abstract A spectrophotometric method based on simultaneous use of first derivative of ratio spectra and measurement of zero-crossing wavelengths resolves ternary mixtures of atrazine, diuron, and chlorpyrifos. Calibration graphs were linear for atrazine between 1 and 15 μg/mL and for diuron and chlorpyrifos between 1 and 10 μg/mL. The pesticides in groundwater and soil were determined by the method, at part-per-billion levels, after solidphase extraction, with good results. Interferences caused by other pesticides were studied.
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