南京地区典型有机污染物长距离输送潜力研究

为研究典型有机污染物在南京地区的长距离输送潜力,以p,p’-DDT、γ-HCH、BaP和HCB为研究对象,运用TaPL3模型计算了其在研究区大气及水体中的长距离输送潜力.结果表明,BaP和p,p’-DDT通过大气的特征迁移距离(CTD)较小,分别为198 km和255 km,表现为大气污染长距离输送能力较小,污染较难扩散;而γ-HCH和HCB则更倾向于通过水体或大气进行长距离输送,其水体CTD分别为91 558 km和19 056 km,大气CTD分别为1 858 km和21 104 km,有利于其在研究区的扩散;水对γ-HCH和HCB的黏着度为负值,分别为-2.1和-54.86,表明γ-HCH和HCB更倾向于滞留在大气环境中,其通过大气并达到稳态后在大气中的质量分数为0.551%和2.2%;通过水体且达到稳态后在大气中的质量分数为0.149%和1.05%,高于p,p’-DDT和BaP.

Long-range Transport Potential of Typical Organic Pollutants in Nanjing

In this study,the long-range transport potentials(LRTP) of typical organic pollutants including p,p′-DDT,γ-HCH,BaP and HCB in air and water of Nanjing were estimated using the TaPL3 model.The research results showed that the characteristic travel distances(CTD) of BaP and p,p′-DDT through air were relatively low,198 km and 255 km,respectively,indicating relatively low LRTP and difficulty in pollution dispersion.In contrast,γ-HCH and HCB tended to transport over longer distances through water and air,with CTD values of 91558 km and 19056 km in water and 1858 km and 21104 km in air,respectively,indicating that the dispersion of pollution in air and water of the studied area was relatively easy.Furthermore,the stickiness of γ-HCH and HCB in water was negative,and the values were-2.1 and-54.86,respectively,indicating that γ-HCH and HCB tended to remain in the atmosphere.The mass fractions in air after they passed air and achieved the steady state were 0.551% and 2.2%,respectively,whereas the mass fractions in air after they passed water and achieved the steady state were 0.149%and 1.05%,respectively,which were higher than those of p,p′-DDT and BaP.