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    STUDIA CHEMIA - Issue no. 4 / 2011  
         
  Article:   QUANTITATIVE EVALUATION OF SOME VOLATILE AROMATIC HYDROCARBONS FROM WATER USING A THREE PHASE EXTRACTION SYSTEM AND GAS CHROMATOGRAPHY ANALYSIS.

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  Abstract:  The analysis of benzene, toluene and xylene by micro extraction into a three phase extraction system (liquid-liquid-solid) followed by gas chromatography is described. The analytes are extracted very fast into a very small volume of organic solvent and simultaneously into a solid sorbent. The efficiency of different solvents: dichloromethane, chloroform, carbon tetrachloride, n-hexane and cyclohexane added to the sample in different volumes used for liquid microextraction were evaluated. The best results were obtained by using dichloromethane. The extracted quantity in the three phase system was significantly higher than the usual two phase liquid-solid microextraction. The RSD was between 11-12%, the linearity was very good (over 1 magnitude order from 5 ng/mL to 6 μg/mL) for all three compounds, the limits of detection (S/N = 3) were in the ppb range and the recoveries between 84-96%. The working conditions (extraction time, temperature, solvent, solvent volume, stirring rate) were optimized. The optimum conditions for the extraction of all three analytes were experimentally established for 200 μL dichloromethane as organic phase, 25°C, at a stirring rate of 400 rpm and 5 minutes extraction time. The developed method was applied for the analysis of purposed compounds in wastewater samples.

Keywords: liquid-solid microextraction, liquid-liquid microextraction, liquid-liquid-solid microextraction, volatile aromatic hydrocarbons, gas chromatography 		 
         
     
         
         
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