Elektrochemisches Verhalten von 2,4‐Diamino‐1,3,5‐triazinen und ihren Photolyseprodukten

2,4-Diamino-1,3,5-triazines are widely applied as herbicides. These compounds are very stable which leads to a accumulation in soil and plants. To detect this group of compounds chromatographic methods (gas chromatography, HPLC, TLC) were employed in the past. The present work was done with the aim to determine electrochemically triazines in flowing systems like HPLC and FIA. Therefore the polarographic and voltammetric behaviour of these compounds was investigated. A sensitive detection was possible on a mercury electrode in the cathodic range and on a glassy carbon electrode pretreated by galvanostatic pulses in the anodic range. The sensitivity can be improved by photochemical derivatization of the triazines in 6-position to create phenol-like compounds. The photochemical response of simazine, prometryne, atrazine and ametryne depends on the substitutes in 2- and 4-position and also in 6-position. The degree of the photochemical conversion was measured with an amperometric detector in a FIA equipment.