废旧电容器存放点多氯联苯的污染特征
CHARACTERISTICS OF PCBs CONTAMINATION FROM A CAPACITOR STORAGE SITE
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摘要: 采用气相色谱-电子捕获检测器测定废旧电容器存放地点附近的土壤和植物中多氯联苯(PCBs)的含量.分析了羊茅草(Festuca.L)的叶和根中PCBs的变化,应用多元线性回归方法定量判别了PCBs污染类型,进而探讨了PCBs的分布特征.结果表明,存放点PCBs污染水平较高,污染类型与Aroclor 1248相似.随着离污染点距离的增加,PCBs浓度急剧下降.污染类型逐步偏离Aroclor 1248,二氯和三氯联苯的百分比升高,四氯和五氯联苯下降.表现出水相和气相传输的作用,在一般情况下,水相传输起主导作用.另外,PCBs在羊茅草的叶和根中浓度的比值有上升的趋势.这种变化趋势和PCBs大气传输过程相关联,大气传输的贡献随着距离的增加PCBs浓度水平逐步下降而逐步显现.Abstract: Polychlorinated biphenyls (PCBs) concentrations in soils and plants from a capacitor storage site were measured using gas chromatograph electron capture detector To investigate PCBs distribution in leaves and roots of Festuca. L,the variations of PCBs congeners were discussed PCBs congener profiles were identified and estimated with multiple linear regression analysis.It was shown that the PCBs concentrations were high and PCBs profile was similar to that of Arolcor 1248 With increasing distance from the contaminated site, PCBs concentrations were reduced dramatically; meanwhile the congener profile was deviated gradually from that of Arolcor 1248 with higher fraction of di-/tri-CBs and lower fraction of tetra-/penta-CBs as consequence of aqueous and atmosphere transport In general, transport in aqueous phase played a major role The ascen ding trend of leave/root ratio of Festuca. L. was attributable to the increasing contribution from atmospheric transported PCBs.
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Key words:
- PCBs /
- Festuca. L /
- transport
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