Two methods for estimating terbutryne residues in water using high-pressure liquid chromatography and gas-liquid chromatography with a conductivity detector.

In late 1973 a slow release formulation of terbutryne (2-ethylamino-6-methylthio-4-tert.-butylamino-1,3,5triazine) was introduced commercially for the control of water weeds (CIBA-Geigy (Clarosan)). Hence it will be of increasing importance for residue analysts to be able to detect low concentrations of this compound in surface waters. In the work reported here two methods are described, one, high-pressure liquid chromatography (HPLC)’ using a UV detector, the other, conventional gasliquid chromatography (GLC) coupled with a conductivity detector*. Although other methods are available for the estimation of this compound3, the authors believe that the present work will be useful in extending the range of instruments that may be used.