【摘要】 2 0 0 2年 3月份我们对贵阳市大气的气态汞形态进行了采样分析。大气气态总汞用Tekran 2 5 37A大气自动测汞仪采集测定。活性气态汞用镀KCl扩散管采集 ,热还原法分解并以冷原子荧光法 (CVAFS)分析。结果显示 ,采样期间贵阳市气态总汞平均浓度为 7.0 9ng m3,活性气态汞平均含量 38.3pg m3。气态总汞浓度远高于全球背景浓度值 ;活性气态汞浓度稍高于欧洲和美国的边远地区。活性气态汞浓度与大气相对湿度呈负相关关系 ,相关系数为 - 0 .39(α<0 .0 1)。由于大气相对湿度较高 ,活性气态汞只占气态总汞的 0 .5 %。原子态汞和活性气态汞的基本来源是燃煤释放更多还原

【Abstract】 TGM and RGM concentrations in ambient air at one site of Guiyang City were determined in March 2002. TGM concentrations were monitored using an automated mercury vapor analyzer Tekran-2537A, and RGM in ambient air was sampled using KCl coated tubular denuders. The sampled RGM denuders were analyzed using thermal desorption coupled with CVAFS detection. The average concentrations of TGM and RGM are 7.09 ng·m -3 and 38.3pg·m -3 ,respectively,during the sampling period. The primary anthropogenic source for both Hg 0 and RGM is coal combustion in the study area. TGM concentrations are significantly elevated comparing to the global background values, whereas RGM concentrations are only slightly higher than the reported values in remote areas in Europe and US. RGM only constitutes 0.5% of TGM in the air at the sampling period. There is a significant negative correlation between RGM concentration and relative humidity (RH), with a coefficient correlation of-0.39 (α<0.01). High relative humidity during the sampling is responsible for the relatively low RGM concentrations observed.更多还原