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Investigation of Persistent Organic Pollutants in Groundwater for Contaminated Sites.

The target of this plan execution is to test and construct complete sampling and analyzing technology of polychlorinated dibenzo-p-dioxins and dibenzofurans, dioxin-like polychlorinated biphenyls and polybrominated diphenyl ethers in underground water, to complete the analysis persistent organic pollutant in contaminated site, and to build background database to offer environmental protection unit with reference basis for amendment of sampling method and development of management standard in the future. The plan has completed sampling and analysis of 10 underground wells, in which the sampling is divided into two sampling methods of front-offcenter and non-offcenter, and the investigation result shows that PCDD/Fs concentration of the underground water monitoring wells is ND~0.150 pg WHO-TEQ/L, and the concentration measured in the monitoring well C18 in Anshun plant is highest. Comparing the equivalent result influence of the Dioxin toxicity of the 10 sampling points with different sampling methods, measured value’s RD (%) of the two sampling methods is -18~14%. In the inspection of PCBs, the concentration of underground water is ND~0.045 pg WHO-TEQ/L, in which the underground well of the internal lake incinerator has the highest concentration, and in the inspection of content of PBDE, the range of underground water concentration is 14~226pg/L, in which the station RCA-06 has the highest one. Comparing the influence of two sampling methods of front-offcenter and non-offcenter to concentration, the investigation result shows that there is no regular changing trend. The plans selects 3 sampling points to discuss the distribution of pollutant in suspended and dissolved states, and the investigation result shows that the suspended-state content of PCDD/Fs and PBDE in the water is higher, but the PCBs in Xiangong Primary School and Anshun plant areas present the opposite trend, where the dissolved-state content of underground water is higher than the suspended-state one. The concentration of persistent organic pollutant in underground water is low, we suggest investigating original waste water or receiving water with high particulate matter or in high-pollution site in the future to evaluate the best opportunity to use the front-offcenter centrifugal machine and build background database of persistent organic pollutant.