Collect. Czech. Chem. Commun. 1983, 48, 2650-2655

A contribution to the determination of 2-imidazolidinethione in mancozeb-type ethylene-bis-dithiocarbamate fungicides by high performance liquid chromatography

Ľubor Bystrický and Vojtech Nátora

Research Institute of Chemical Technology, 836 03 Bratislava


The effect of conditions on the extraction-chromatographic determination of 2-imidazolidinethione (ETU) in mancozeb was investigated. The effect of the extraction time and presence of Na2SO4 is not critical if the samples are analyzed immediately after the extraction with methanol, but marked changes in the content of ETU and composition of the matrix appear if the samples are allowed to stand for a long period before the chromatographic treatment. The combined effects of heat, moisture and pH of medium leading to enhanced contents of ETU were also examined.