| 典型电力电容器污染土壤中多氯联苯水平及特性 |
| 摘要点击 2387 全文点击 1783 投稿时间：2015-01-26 修订日期：2015-04-17 |
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| 中文关键词 多氯联苯 土壤修复 含量水平 分布特性 毒性当量 |
| 英文关键词 PCBs soil remediation concentration levels distribution pattern toxic equivalent quantity |
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| 中文摘要 |
| 以3个PCBs污染物封存点周边土壤为对象,详尽研究了典型电力电容器污染土壤中209种PCBs同系物含量水平、分布特性及毒性当量,了解污染土壤中PCBs的污染水平和环境风险,为PCBs污染土壤的场地修复提供支撑. 对来自于3个污染场地的12个污染土样分析表明, Soil A总PCBs含量为1705.0μg ·g-1±424.3μg ·g-1(n=4),高于Soil B(233.0μg ·g-1±80.0 μg ·g-1,n=4)和Soil C(225.7μg ·g-1±90.2μg ·g-1,n=4),显示3种土壤均受到PCBs严重污染. 不同氯代数的PCBs分子中,三氯联苯及四氯联苯含量最高. Soil A、Soil B及Soil C中PCBs的氯元素质量分数分别为43.7%±1.0%、45.5%±0.5%和44.9%±0.3%,这一比例接近Aroclor1242以及国产1号PCB绝缘油. 指示性PCBs与总PCBs含量之间存在明显相关关系,线性拟合方程R2=0.998. 应用指示性PCBs可有效估算总PCBs含量,简化样品分析过程. 类二噁英多氯联苯以PCB77、PCB105及PCB118为主,三者之和占dl-PCBs的89.5%±4.0%. 污染土样的毒性当量(以WHO-TEQ计)介于3.56~63.55 ng ·g-1之间,显示该区域具有较高的环境风险. PCB28/31、PCB33/20、PCB66/80、PCB70、PCB32及PCB18等是含量最高的PCB单体. 与国内外其他研究相比,该封存点土壤受到了高浓度PCBs污染,具有较高的环境风险. |
| 英文摘要 |
| The homologues levels, distribution characteristics and TEQ of 209 PCBs in soil collected around 3 storage sites of PCB-containing wastes were investigated. The PCBs contents and environmental risk were evaluated to provide a scientific basis for site remediation of PCBs contaminated soil. Totally 12 soil samples were collected from 3 PCB-contaminated sites. The analysis results showed that the PCB-concentration in Soil A was 1705.0 μg ·g-1±424.3μg ·g-1(n=4), higher than Soil B (233.0μg ·g-1±80.0μg ·g-1, n=4) and Soil C (225.7μg ·g-1±90.2μg ·g-1, n=4), indicating the soil was heavily polluted by PCBs. Trichlorobiphenyl and Tetrachlorobiphenyl dominated the homologues of PCBs. The mass fraction of chlorine in Soil A, Soil B and Soil C was 43.7%±1.0%, 45.5%±0.5% and 44.9%±0.3%, respectively, which was similar as Aroclor1242 and 1#PCB insulating oil. There was an obvious linear correlation between indicator PCBs and total PCBs (R2=0.998), so indicator PCBs can be used to estimate the level of total PCBs. PCB77, PCB105, PCB118 were predominant in doxin-like PCBs, accounting for 89.5%±4.0% in total. The TEQ levels of the soil samples (in WHO-TEQ) were 3.56-63.55 ng ·g-1, which demonstrated a high environmental risk in the area. PCB28/31, PCB33/20, PCB66/80, PCB70, PCB32 and PCB18 were the main PCBs isomers. Compared with other results, the local soil was heavily contaminated by PCBs and the surroundings were under a relatively high risk of environmental contamination. |
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