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目的相比于空气样品,树皮具有易采集,易运输和对POPs有很好吸附等特点,利用树皮作为生物指示物监测空气中半挥发性有机化合物。方法该研究选择我国某电子垃圾典型拆解地区作为试验点,采用高通量同位素稀释-高分辨气质联用法分析树皮样品(n=23)中的二噁英。结果结果显示树皮中二噁英的总浓度为(107.8±12.4)×103pgg-1脂肪重,毒性当量为(1.3±0.1)×103pgTEQg-1脂肪重。通过和其它地区的研究对比发现,该地区树皮样品中二噁英浓度是目前为止所有同类样品中浓度最高的之一,该结果表明试验点地区受到严重的二噁英污染。结论通过对树皮中二噁英的指纹特征进行研究,说明该地区二噁英污染主要来源于电子垃圾的无序焚烧。
OBJECTIVE In comparison with air samples, bark has characteristics of easy collection, easy transportation and good adsorption of POPs. The bark is used as biological indicator to monitor the semi-volatile organic compounds in the air. Methods In this study, a typical dismantling area of e-waste in China was selected as the experimental site. Dioxins in bark samples (n = 23) were analyzed by high-throughput isotope dilution-high resolution gas chromatography-mass spectrometry. The results showed that the total concentration of dioxins in the bark was (107.8 ± 12.4) × 103pgg-1 fat weight and the toxic equivalent weight was (1.3 ± 0.1) × 103pgTEQg-1 fat weight. Comparisons with studies in other regions found that dioxin concentrations in the bark samples in the area were by far the highest concentrations in all similar samples, indicating that the area under test was heavily contaminated with dioxins. Conclusions The dioxin fingerprinting in the bark was studied to show that the dioxin pollution in this area mainly comes from the disordered incineration of e-waste.