| 东营市孤岛地区土壤中类二噁英类PCBs的污染特征 |
| 摘要点击 2659 全文点击 1719 投稿时间：2012-09-11 修订日期：2012-10-23 |
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| 中文关键词 类二噁英类PCBs 孤岛地区 土壤 污染特征 生态风险 |
| 英文关键词 dioxin-like polychlorinated biphenyls (DL-PCBs) Gudao Region soil characteristic ecological risk |
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| 中文摘要 |
| 2011年4月采集了东营市孤岛地区20个表层土壤样品,采用索氏提取-弗罗里土柱净化-气相色谱-电子捕获检测器检测的方法对采集的样品进行测定,揭示了该地区表层土壤中类二噁英类PCBs(dioxin-like polychlorinated biphenyls,DL-PCBs)的污染特征. 结果表明,DL-PCBs的含量范围为1.4~7.4 μg·kg-1,平均含量为(3.5±1.7) μg·kg-1; DL-PCBs的毒性当量为1.2~31.8 ng·kg-1,平均值为5.4 ng·kg-1,超过了加拿大土壤环境质量标准(4.0 ng·kg-1). 各采样点间DL-PCBs的同系物组成相似,均以四氯联苯和五氯联苯为主,两者之和超过DL-PCBs总量的80%; 从孤岛城镇到郊区,DL-PCBs的含量逐渐降低,这与许多化工厂分布在城镇周围有关. 相关性分析显示,土壤中DL-PCBs的含量与土壤有机碳含量与黏粒含量显著正相关(R2分别为0.732和0.687,P<0.01),而与土壤砂粒含量负相关(R2=-0.438,P<0.05). |
| 英文摘要 |
| To investigate pollution characteristics of dioxin-like polychlorinated biphenyls (DL-PCBs) in Gudao Region, Dongying City, twenty surface soil samples were collected in April, 2011. The DL-PCBs in soil samples were determined by Soxhelt extraction-Florisil purification-Gas Chromatography(GC)-Electron Capture Detector(ECD). The concentration of DL-PCBs in surface soils ranged from 1.4 μg·kg-1to 7.4 μg·kg-1, with the mean concentration of (3.5±1.7) μg·kg-1. The total TEQ level was between 1.2 ng·kg-1and 31.8 ng·kg-1, and the mean TEQ was 5.4 ng·kg-1, which exceeded the Canadian soil environment quality guidelines (4.0 ng·kg-1). The congener profiles of DL-PCBs were similar among sites. Tetra-CB and penta-CB were the major homologues in all soil samples, together accounting for more than 80% of the total DL-PCBs. The level of DL-PCBs exhibited a decreasing trend with the increasing distance from the Gudao town to the suburb, which could be attributed to the chemical plants around the town. The correlation analysis showed that the concentration of DL-PCBs was positively correlated with the organic matter content and clay particle content (R2 were 0.732 and 0.687, separately, P<0.01), but negatively correlated with the sand particle content (R2=-0.438, P<0.05). |
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