Comparative study of the zero-crossing, ratio spectra derivative and partial least-squares methods applied to the simultaneous determination of atrazine and its degradation product desethylatrazin-2-hydroxy in ground waters.

The application of the ratio spectra derivative and partial least-squares methods to the simultaneous determination of atrazine and its degradation product desethylatrazin-2-hydroxy is presented. When the different methods are applied to the determination of these products in ground waters, PLS method gives the best results due to the presence of interfering substances with overlapping spectra.