作　　者： ; ; ; ; ; ; ; ;

机构地区： 中国科学院广州地球化学研究所有机地球化学国家重点实验室

出　　处： 《环境污染与防治》 2008年第2期8-11,28,共5页

摘　　要： 为了研究电子垃圾焚烧产生的二噁英对周围环境的影响,同时在E1和E2采样点分别采集9个大气样品。E1周围分布大量的电子垃圾焚烧点,E2则位于E1南9km处,周围无其他明显的二噁英排放源。所采样品用同位素稀释法进行分析测定,结果表明,E1和E2大气样品中二噁英的平均质量浓度分别为127.37、22.37pg/m3,平均毒性当量浓度分别为8.777、1.305pgI-TEQ/m3。八氯代二苯并呋喃(OCDF)、八氯代二苯并二噁英(OCDD)、七氯代二苯并呋喃(1,2,3,4,6,7,8-HpCDF)和七氯代二苯并二噁英(1,2,3,4,6,7,8-HpCDD)对2,3,7,8位氯代的二噁英的总浓度贡献较大,而五氯代二苯并呋喃(2,3,4,7,8-PeCDF)则对总毒性当量浓度贡献最大,其贡献率超过40%。在E1和E2两个采样点,二噁英在气相中的比例均随着氯原子取代数的增加而降低。两采样点相似的二噁英分布模式和气固分配,说明E2大气中二噁英主要来自于E1电子垃圾焚烧产生的二噁英。 A set of nine air samples was each collected at two sampling sites to determine the effects of PCDD/ Fs emitted from electric waste combustion on the ambient atmospheric environment. Sampling site E1 was surrounded by many electronic waste combustors, while E2, at 9 km away, had no emission sources of PCDD/Fs nearby. The i- sotope dilution method was employed in the sample analysis. The average concentration （TEQ） of PCDD/Fs at E1 and E2 were 127.37 pg/m3 （8. 777 pg I-TEQ/m^3） and 22.37 pg/m^3 （1. 305 pg I-TEQ/m^3）, respectively. OCDF, OCDD, 1,2,3,4,6,7,8-HpCDF and 1,2,3,4,6,7,8-HpCDD were the important contributors to the overall concentration of 2,3,7,8-PCDD/Fs congeners, while 2,3,4,7,8-PeCDF accounted for more than 40 ~//00 of the relative TEQ. Both sets of the samples had similar species distribution and gas-particle partitioning patterns; the fraction of different PCDD/Fs congeners in the gas phase decreased with increasing number of chlorine. PCDD/Fs in the atmosphere at E2 came from the emission sources of the E1 area.

关 键 词： 二噁英 电子垃圾 高分辨率气相色谱 高分辨率质谱 分布模式

领　　域： [环境科学与工程] [环境科学与工程]