Abstract
A method of determining small quantities of IPC (isopropyl-N-phenylcarbamate), CIPC (isopropyl-N-(3-chlorophenyl) carbamate) and DCB (2,6-dichlorobenzonitril or dichlorobenzil) in an extract by gas-liquid chromatography is described. A satisfactory separation of DCB by steam distillation of the homogenized tuber tissue, followed by an extraction of the steam distillate with an organic solvent (n-pentane) and concentration of the extract, appears to be possible. For IPC and CIPC steam distillation is only successful if a relatively small quantity of tuber tissue is treated in a large volume of water. An alternative method is direct extraction by homogenizing in dichloromethane. It is of importance, more particularly for IPC and CIPC, to take into consideration in the analysis the yields of these substances which are obtained after separation. The lower limit of analysis for the apparatus used in this study is ca. 0.3 p.p.m.
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