[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, gamma-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, gamma-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 gamma-HCH and HCB in water was negative, and the values were -2.1 and -54.86, respectively, indicating that gamma-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.