Automatic spotting of pesticide extracts on thin-layer plates

Abstract
An apparatus has been devised to apply on a thin-layer sheet 9 samples of 1 or 2 ml of a solvent extract at a rate of 1 ml/20 to 30 min, thereby allowing the solvent to be evaporated by an airstream. Spots were 5 to 6 mm in diameter, and no attention of the analyst was required during spotting. The apparatus has been used to analyze for chlorinated hydrocarbons in soils.