广州地区PBDEs长距离迁移潜力和总持久性模拟

运用TaPL3.0模型对7种PBDEs同系物在广州地区的长距离迁移潜力(LRTP)和总持久性(Pov)进行了模拟研究,并通过灵敏度分析得到了模型的关键参数.研究结果显示,PBDEs排放至大气中,特征迁移距离(CTD)为296~811km,均值为557km;Pov为19~279d,均值为184d;PBDEs平均约有73.8%分布在土壤中,16.9%分布在沉积物中,9.3%分布在其他三相中.PBDEs排放到水体时,CTD为3090~4291km,均值为3731km;Pov范围为228~854d,均值为731d;平均约92.1%分布在沉积物中,6.8%分布在水相中,1.1%在大气、土壤和植被相中.BDE47迁移潜力最大,BDE209易残留于源区形成点源性污染.PBDEs各同系物主要分布在沉积物和土壤中.随着溴代程度升高,CTD逐渐降低,Pov逐渐升高,与国外研究趋势一致.

Simulation of long-range transport potential and overall persistence of PBDEs in Guangzhou

The long-range transport potential(LRTP)and overall persistence(Pov)of 7 PBDEs through air and water in Guangzhou were estimated using the TaPL3.0 model.In addition,the key parameters of the model were identified by sensitivity analysis method.The study results suggested that the CTD(air) ranged from 296 km to 811km,and the mean value was 557 km.Pov(air) was between 19 and 279d,and the mean value was 184d.There were near 73.8% of PBDEs distributed in soil,16.9% in sediment,and 1.3% in water,respectively.While the CTD(water) was from 3090km to 4291km,and the mean value was 3731km,Pov(water) was from 228d to 854d,and the mean value was 731d.There were near 92.1% of PBDEs distributed in sediment,6.8% in water,respectively 1.1% in other environmental media including air,soil and plants.Futhermore,this case study also showed that the BDE47 congener exhibited the strongest transport potential and transported to remote regions,moreover,BDE209 tended to stay in the study area.The 7 congeners of PBDEs distributed mainly in sediment and soil.This paper also indicated that the CTD values tended to be lower with the increase of Br numbers,on the contrary,Pov values tended to be higher.In addition,the research conclusions well agreed with the study results of similar foreign research.