TRANSFORMATION PROCESSES, POSSIBLE SOURCES AND SINK OF PCDD/FS IN A RESERVOIR IN NORTHERN TAIWAN
In this study, polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) deposition was sampled at Feitsui Reservoir in northern Taiwan via traditional cylindrical vessels (atmosphere) and sediment trap (water body) from January to December 2008. The sampling results indicate that the PCDD/F deposition fluxes measured in atmosphere (1.37 to 19.3 pg-I-TEQ/m2-day) are significantly lower than that sampled in the water body (10.3 to 29.8 pg-I-TEQ/m2-day) at 20 m water depth. That may be attributed to the fact that the PCDD/F depositions collected in the water body are mostly provided by catchment erosion at down stream of the reservoir investigated. The results also indicated that around 26 to 46％ PCDD/F input flux in the reservoir investigated was contributed by the atmospheric deposition. However, the contribution of atmospheric PCDD/F deposition reduced to 10％ during the typhoon event. During the intensive typhoon events (September 2008), the PCDD/F deposition flux in water body at 70 m water depth (179 pg-I-TEQ/m2-day) was dramatically higher than that measured at 20 m water depth (21.1 pg-I-TEQ/m2-day). It is possible caused by the land slide taking place upstream of the reservoir during the typhoon period. Interestingly, the PCDD/F input flux from atmospheric deposition in the reservoir investigated increased to 57％ during the Asian dust storm event.
Chi KH Kao SJ Lee TY Chang SH Chang MB
Research Center for Environmental Changes,Academia Sinica,Taipei 115 Environmental Analysis Laboratory,EPA,Chungli 320 Graduate Institute of Environmental Engineering,National Central University,Chungli 320
国际会议
北京
英文
1-6
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）