SOLID-PHASE MICROEXTRACTION USING PENCIL LEAD AS SORBENT FOR ANALYSISOF ORGANIC POLLUTANTS IN WATER

Most solid-phase microextraction methods are based on poly(dimethylsil oxane)-coated silica fibers. In the present study, pencil lead was use d as an alternative sorbent for solid-phase microextraction. Its appli cation to three organic pollutants with different polarity in water wa s investigated. The detection limit for determination by gas chromatog raphy with electron capture detector was 0.005 ng ml(-1) for lindane, 0.05 ng ml(-1) for methyl parathion and 1 ng ml(-1) for 2-chlorophenol . The presence of dissolved humic substances (10 mg l(-1)) in water di d not affect the extraction of the three analytes.