Brominated flame retardants (BFRs) are used in plastic housings of electronic equipment and in circuit boards to preventflammability. More than 50% of BFRs usage in the electronics industry consists of tetrabromobisphenol A (TBBPA), 10% is polybrominated diphenyl ethers (PBDEs) and less than 1% is polybrominated biphenyls (PBB). Various scientific observations indicate that PBDEs might act as endocrine disrupters. Research has revealed that levels of PBDEs in human breast milk are doubling every five years and this has prompted concern because of the toxic effect of these chemicals. Polybrominated Biphenyls (PBBs) may cause an increased risk of cancer of the digestive and lymph systems. Since 2009 Stockholm Convention banned production of PBDEs and removed their use in commercial products. Actually, there are a few methods to extract PBDEs from different matrices; one of the most used techniques for extracting PBDEs is Microwave Assisted Extraction (MAE). The advantages to use this kind of extraction are shorter extraction time, lower solvent consumption and the possibility for automation. In this work leachate samples were taken from 2 landfills in metropolitan area of Mexico City and stored at 4� C until its use. Samples were introduced with different volumes of the extractive solutions to the closed vessels designed for MAE. As extractive solutions, both methanol/isopropanol (1:1, v/v) and hexane/acetone (var. vol., v/v) were employed at different times and temperatures. The optimization of extraction was based on a factorial design. Clean-up was made by the use of micro column packed as a solid phase extraction (SPE) and the concentration of eluate was analyzed using gas chromatography-mass spectrometry. Concentrations of pollutants using MAE are in the range of 0.04 � 0.29 ng/mL. BDE-47 presents the highest concentration. Complete results of concentration, linearity, reproducibility and repeatability will appear in the whole presenting of work.

PBDE's analysis in leachate from landfills in Mexico using microwave assisted extraction

248th National Meeting (2014)

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