Atmospheric deposition characteristics and fluxes of heavy metals in Lake Ulansuhai

This paper studied heavy metal pollution of the Lake Ulansuhai caused by atmospheric deposition. Atmospheric deposition samples using a wetting method were collected in 1-30 July,2013 around the lake. The monthly deposition flux and the heavy metal elements of Cu,Zn,Pb,Cd,Cr,Hg and As deposition to the lake were measured. The element deposition flux ranked in Zn Pb Cu Cr As Hg Cd. The Lake Ulansuhai social investigation and data analysis showed that a larger deposition flux was distributed under the main wind direction as the heavy metals absorbed on the atmospheric particles moved and deposited relying on the wind. Wind is one of the factors affecting the Take Ulansuhai atmospheric heavy metals deposition flux. Besides the large heavy metal amount entering into the lake in the way of draining,the atmospheric deposition was another important pollution sources. The monthly atmospheric deposition amount of Zn,Pb,Cu,Cr,As,Hg and Cd into the lake were 10. 6,1. 04,1. 02,0. 833,0. 342,0. 00514 and 0. 00281 t / month. The heavy metal pollution contribution by the atmospheric deposition was estimated by the increment of heavy metals in the sediments. The atmospheric deposition contribution of Hg,Zn,Pb,Cu,As,Cd and Cr are estimated with 46. 4%,44. 7%,14. 1%,12. 0%,8. 48%,4. 75% and 4. 03%,respectively.