| In order to grasp the concentration levels and the variation characteristics of air mercury indoors and outdoors under the condition of seasonal snow cover in winter, four sampling sites in Jiapigou gold mine area have been set and the concentration level of gaseous mercury have been monitored continuously by Zeeman RA915+ as well as air pressure, temperature and wind velocity simultaneously. The distribution characteristics of the gaseous mercury indoors were explored and its major sources as well as releasing process came into the focus of the analysis. The result is represented that the concentration levels（based on the height of 150 cm from the ground）are 106.8 ng·m-3,6.1 ng·m-3, 5.8 ng·m-3 and 1.8 ng·m-3 in the four sampling sites of Spring and Autumn Hotel, outdoor Hotel, spacious cornfield and woods. Furthermore, it is shown that the concentration level of gaseous mercury indoors is 2 orders higher than that of the outdoors. In addition, during the winter seasonal snow cover period, the natural releasing process of gaseous mercury is weaker while it is the releasing process impacted by human contributing to the distinct changes in concentration as well as variation trend of gaseous mercury that converses to be the major source. Overall, the temperature inversion severely results in the proliferation of the gaseous mercury, which can be designated as the cause for the serious mercury pollution partially in time and space. |
