长株潭城市群二噁英污染水平初探

采集长株潭地区土壤/沉积物样品并对样品中二噁英类物质浓度水平和分布形态进行分析研究。结果表明：表层土壤中PCDD/Fs的浓度范围为267～7 509.61 pg/g,均值为2 175.00 pg/g;I-TEQ浓度范围为0.92～10.21 pg/g,均值为4.82 pg/g。PCDD/Fs与我国其他地区相比,处于高浓度水平。表层沉积物PCDD/Fs含量浓度范围为876.17～497 759.30 pg/g,均值为160 765.91pg/g;I-TEQ浓度范围为2.63～1 031.21 pg/g,均值为332.55 pg/g。50%湘江沉积物样品TEQ的浓度大于80 pg/g,说明该地区河流沉积物已经对某些物种构成了威胁。另外分析了土壤/沉积物中PCDD/Fs同类物的分布特征,并分析可能的污染来源。

Preliminary Study on Level and Pattern of PCDD/Fs in Soil of Changsha-Zhuzhou-Xiangtan Urban Agglomeration

The concentration levels and distribution patterns of PCDD/Fs in soil/sediment sampled from Changsha-Zhuzhou-Xiangtan urban agglomeration were preliminarily investigated.The results showed that the concentrations of PCDD/Fs in surface soil samples ranged from 267 to 7509 pg/g with 2175.00 pg/g mean concentration.The I-TEQ concentrations were ranged from 0.92～10.21 pg/g with mean 4.82 pg/g concentration.The level of PCDD/Fs concentration were higher compared with other area of China.The concentrations of PCDD/Fs in sediment samples were ranged from 876.17 to 497759.30 pg/g with 160765.91 pg/g mean concentration,and the I-TEQ concentrations were ranged from 2.63～1031.21 pg/g with mean 332.55 pg/g concentration.The observation that the TEQ concentrations in 50% of sediment samples were over 80 pg/g,indicated there had posed a threat to some species.Moreover,the distributions of TEQ concentration of 17 single isomers of PCDD/Fs in samples were analyzed and the potential pollution sources were discussed.