Evaluation of Atmospheric PCDD/F Depositions via Automated and Traditional Water Surface Samplers in Taiwan
- 作者：Kai Hsien ChiShuh Ji KaoShu Hao ChangMoo Been Chang
- 会议时间：2012-03-01
- 关键词：Dioxins ; deposition ; water surface sampler ; aerosol
- 作者单位：Kai Hsien Chi(Institute of Environmental and Occupational Health Sciences,Taiwan Yang Ming University,Taipei)Shuh Ji Kao(Research Center for Environmental Changes,Academia Sinica,Taipei)Shu Hao Chang,Moo Been Chang(Graduate Institute of Environmental Engineering,Taiwan Central University,Chungli)
- 母体文献：第九届海峡两岸气溶胶技术研讨会暨第二届海峡两岸环境保护双门论坛论文集
- 会议名称：第九届海峡两岸气溶胶技术研讨会暨第二届海峡两岸环境保护双门论坛
- 会议地点：厦门
- 主办单位：中国颗粒学会
- 语种：chi
摘要
Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) are a group of compounds of major environmental concern.Once emitted into the atmosphere,PCDD/Fs undergo photochemical reactions and enter other environmental compartments via wet and dry deposition.In this study,atmospheric PCDD/F depositions were collected via an automated PCDD/F deposition sampler and traditional cylindrical vessels,respectively,in northern,central and southern Taiwan from 2008 to 2010.The automated PCDD/F precipitation sampler used in this study can prevent both re-suspension and photodegradation of the PCDD/Fs collected and also effectively separates the PCDD/F samples into dry and wet contributions.The results indicate that the average atmospheric PCDD/F concentrations collected by the high-volume sampling trains were: 13.6±10 (n=10),15.6±5.2 (n=7) and 10.9±6.3 (n=6) fg I-TEQ/m3 in northern,central and southern Taiwan,respectively.In addition,the results also indicate that the PCDD/F deposition flux collected with an automated PCDD/F sampler (1.84±0.90~8.68± 5.1 pg I-TEQ/m2/day,n=23) is significantly higher than that sampled with cylindrical vessels (1.11 ± 0.69~5.64 ± 5.2 pg I-TEQ/m2/day,n=23).Based on the Mann-Whitney statistical analysis,the p value (0.037) of PCDD/F deposition flux between those two samplers measurement is lower than 0.05.The difference is attributed to the fact that part of the PCDD/F depositions collected by traditional cylindrical vessels is photo degraded and re-volatilization.