Abstract
The efficiency of methods for the determination of hexachlorobenzene (HCB) and pentachlorophenol (PCP) in soil samples was evaluated. An on-line method was applied for HCB determination. Soil samples were transferred to chromatographic columns prepacked with alumina. The HCB elution was processed with n-hexane. The PCP was extracted from soil samples with n-hexane–acetone in an ultrasonic bath. After re-extraction with K 2CO 3 solution PCP was acetylated with acetic anhydride. The pentachlorophenyl acetate derivative was then extracted with n-hexane. The HCB and PCP derivative were analyzed by gas chromatography with electron capture detection (GC-ECD). Mean recoveries obtained from soil samples fortified at levels of 0.5; 4 and 20 ng g −1, ranged from 91 to 100% for HCB, and for PCP, at levels of 10; 40 and 200 ng g −1, ranged from 88 to 101%. These results demonstrated the efficiency of the proposed methods.
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