Journal of the Brazilian Chemical Society | |
Screening method for rapid determination of polychlorinated biphenyls in transformer oil by liquid-liquid extraction and gas chromatography-mass spectrometry | |
Toledo, Carla1  Valle, Luis1  Richter, Pablo1  Narváez, Jessica1  Universidad de Chile, Santiago1  | |
关键词: PCBs; oil transformer; liquid-liquid extraction; GC-MS; | |
DOI : 10.1590/S0103-50532007000500010 | |
学科分类:化学(综合) | |
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】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912050580221ZK.pdf | 77KB | download |