Abstract
A modified liquid extraction method for determining trace amounts of lower halogenated hydrocarbons in drinking water has been studied. A 45 ml sample solution containing not less than 5 μg litre −1 of CHCl 3, CHCl:CCl 2, CHBrCl 2, CHClBr 2, CHBr 3 and CCl 2:CCl 2 and 0·4 μg litre −1 of CCl 4 was extracted with 5 ml of xylene. The equilibrium concentrations of lower halogenated hydrocarbons in the xylene phase were determined by a gas chromatograph equipped with an electron capture detector and using a column which consists of tricresyl-phosphate (90 cm), squalane (170 cm) and silicone DC 200 (40 cm). By means of this method, μg litre −1 levels of lower halogenated hydrocarbons in drinking water were determined successfully.
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