The method for the determination of propazine, simazine, bromacil, hexazino
ne and metoxuron by zero order and derivative spectrophotometry has been wo
rked out. First order derivative spectra were applied for the determination
of bromacil and the second order ones for the determination of hexazinone
in their mixtures. Metoxuron was determined in the presence of hexazinone b
y normal or derivative spectrophotometry, whereas hexazinone only by the fi
rst or the second order derivative spectrophotometry. First order derivativ
e spectrophotometry was also applied for the determination of propazine and
simazine in the presence of bromacil, hexazinone and metoxuron. In the thr
ee- component mixtures it was possible to analyse metoxuron in the presence
of bromacil and hexazinone using the first order derivative spectra and br
omacil in the presence of metoxuron and hexazinone applying the second orde
r derivative spectra.