Abstract
ABSTRACT Stir-bar sorptive extraction followed by liquid desorption with gas chromatography using electron capture detection had been applied for the determination of eleven chlorinated hydrocarbons (mainly chlorobenzenes) in water matrix. The optimisation of parameters that could influence SBSE-LD efficiency on both extraction and desorption steps was carried out. Parameters such as time and temperature of extraction, salt and stirring rate, type of back desorption solvent, desorption time and temperature, ultrasonic effect were studied and optimised. The highest extraction efficiency was obtained using 60 min extraction time (1000 rpm; 35°C), a solution containing 10% (w/v) sodium chloride and 30 min for the desorption period with ethyl acetate as back-extraction solvent. Under these conditions, the method gives limits of detection in the range from 0.3 to 4.0 ng L−1, a linear dynamic range of 50–1000 ng L−1 and the relative standard deviations are ≤11.1%. The obtained high relative recoveries for the determination of chlorinated hydrocarbons in various water environmental samples testify to the possibility of practical application of the developed method. The results demonstrate that the technique is simple and sensitive, and thus represents an attractive alternative for ultra-trace analysis of chlorinated hydrocarbons in water samples.
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