Heavy metal characteristics of Kunming main city zone in the fall and winter precipitation

摘要

The precipitation samples of Kunming main city zone were collected from October 2013 to January 2014, and the dissolved state Cr, Mn, Ni, Cu, Zn, Cd, Pb and other heavy metal ions of them were determined with the ICP-MS. Through analyzing and comparing the experimental data with cities at home and abroad, this paper got two sides results. The domestic side: the Pb and Mn contents of Kunming are the minimum, slightly higher contents are Cu, Ni, and Cr, but they are also parts of the downstream level. Abroad: the contents of Mn, Cu, Ni, and Zn are higher than that of Japan and Germany, but the contents of Mn, Pb and Cd are lower than that of Belgium. The contents of Cu, Zn, Pb and Cr of the fall and winter precipitation of Kunming main city zone are all reach at Class II of "Surface Water Quality Standards", and As and Cd reach at Class I standard, the content of Mn is lower than the standard detection limit, therefor, this provided a guarantee of water security for Kunming main city zone, which depends on precipitation recharge production and living water.