珠江三角洲低丘土壤中二类(口恶)(口英)化合物污染水平

应用高分辨气相色谱/高分辨质谱(HRGC/HRMS)对珠江三角洲佛山市某地山丘土壤中二类化合物(PCDD/Fs)含量进行了分析.结果表明,土壤样品中的2,3,7,8-PCDD/Fs含量为0.90~7.89pg-TEQ/g,与土壤pH值具有显著的相关性.pH值偏离pH7越远,土壤中2,3,7,8-PCDD/Fs含量越高.造成研究区内小范围土壤中2,3,7,8-PCDD/Fs含量差异很大且出现较高含量的原因可能与该地曾堆放与焚烧生活垃圾、废旧电线电缆等固体废物有关.本研究样品中2,3,7,8-PCDD/Fs同系物分布特征与目前报道的工业来源的PCDD/Fs分布特征并不一致,表明该地区的PCDD/Fs的来源或污染过程还应作进一步的研究.

Levels of PCDD/Fs in clivose natural soils of Pear River Delta

The contents of dioxins compounds (PCDD/Fs) in the soil of certain hillock in Foshan City, Pear River Dalta were analyzed applying HRGC/HRMS. The content of 2,3,7,8-PCDD/Fs in the soils sample was 0.90~7.89pg-TEQ/g, and possessed marked relation with the pH value of soil. The farther the deviation of pH value from neutral value, the higher the content of 2,3,7,8-PCDD/Fs in soil. Causing this content different very greatly in small range of the studied area, and appeared higher 2,3,7,8-PCDD/Fs content might be related to the stacking and combustion of the living garbage and the solid wastes of waste electrical wires etc. on this land. The distribution character of 2,3,7,8-PCDD/Fs same system matter in this studied samples and the character of the matter from industrial source reported recently were not identical, which indicated that the sources or pollution process of PCDD/Fs pollutants in this region should be further studied.