Screening method for rapid determination of polychlorinated biphenyls in transformer oil by liquid-liquid extraction and gas chromatography-mass spectrometry

Journal of the Brazilian Chemical Society

Carla Toledo¹  Luis Valle¹  Jessica Narváez¹  Pablo Richter¹ 

[1] ,Universidad de Chile Facultad de Ciencias Químicas y Farmacéuticas Centro de Estudios para el Desarrollo de la QuímicaSantiago Chile

关键词: PCBs;    oil transformer;    liquid-liquid extraction;    GC-MS;   

DOI  :  10.1590/S0103-50532007000500010

来源: SciELO

【 摘 要 】

A rapid and simple method was developed for screening polychlorinated biphenyls in transformer oil. The method is based on liquid-liquid extraction in methanol and subsequent direct gas chromatography-mass spectrometric determination. The extent of methanol polarity allows to extract the PCBs, co-extracting a minimum amount of the apolar oil components, thus avoiding the time-consuming steps involving in sample preparation. Since the regulation established internationally for wastes containing PCBs is 50 mg kg-1, the method rapidly determines whether the transformer oil is PCBs-contaminated or not. In order to reach the best conditions for extraction a multivariate optimization was carried out considering two significant variables: volume of methanol and extraction time. Under optimum conditions, recoveries of Aroclor 1256 and Aroclor 1260 were between 80 and 100%, and precision, expressed as relative standard deviation, was from 2 to 4%. The method was applied to real samples polluted with PCBs.

【 授权许可】

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