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658805 
Journal Article 
Evaluation of the liquid-liquid extraction technique and application to the determination of volatile halo-organic compounds in chlorinated water. 
Tiedra, PG; Ruano, A; Gomez, JA; Garcia-Villanova, RJ 
1992 
605 
2 
251-255 
BIOSIS COPYRIGHT: BIOL ABS. The experimental conditions of a simple liquid-liquid extraction method for the determination of sixteen volatile halo-organic compounds, including the main trihalomethanes (THMs), in water were evaluated. The volatile halo-organic compounds were extracted with n-pentane and analysed by gas chromatography using a semi-capillary column and an electron-capture detector. The extraction recoveries for the four THMs were almost complete and the detection limits were lower than 1 mug/l. The method was applied to the analysis of raw and chlorinated water from the river Tormes for distribution in the city of Salamanca (Spain). Chloroform and bromodichloromethane were detected in all the chlorinated water samples; the mean concentrations determined in the finished water were 9.59 and 2.58 mug/l, respectively, from February to July, 1991. 
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