摘要
为研究中国城市新城区气态总汞(TGM)的浓度变化特征及来源,以昆明市呈贡新城区为研究对象,利用高时间分辨率自动测汞仪(UT\|3000型)于2018年4月、6月、11月、12月对该区域进行了监测。结果表明,监测期间呈贡新城区TGM平均质量浓度为(1.0±0.5)ng/m 3,低于昆明市主城区,与瓦里关背景点相近,说明此区域受人为排放源影响较弱。秋季TGM平均质量浓度最高,为(1.6±0.5)ng/m 3,受到上风向滇池释汞的影响较大。夏季TGM最低((0.7±0.2)ng/m 3),主要受降雨湿沉降的影响。气团后向轨迹和火点图分析表明,春季TGM浓度受到生物质燃烧源和有色冶炼源传输的影响,而昆明市本地风向、风速的快速改变会造成扬尘对TGM的累积贡献。
To investigate the concentration variations and sources of total gaseous mercury(TGM)in the China’s new urban area,TGM was continuously monitored at Chenggong District of Kunming,a representative of the new urban area.Four measurement campaigns were carried out to monitor TGM by using automated mercury analyzers(model UT-3000)in April,June,November and December 2018,respectively.The results showed that the average mass concentration of TGM of study area was(1.0±0.5)ng/m 3,which was much lower than the main urban area of Kunming but similar to the background at Waliguan,suggesting that the atmosphere was not obviously anthropogenic emission polluted.Affected by release of mercury from the Dianchi Lake which was located in the upwind direction of Chenggong District,the average mass concentration of TGM in autumn was the highest((1.6±0.5)ng/m 3).Affected by the wet deposition by rainfall,the mass concentration of TGM was the lowest((0.7±0.2)ng/m 3)in summer.TGM concentrations in spring were associated with the transport of the sources of biomass burning and non-ferrous smelting emissions by the results of backward trajectory and fire spots,while the rapid change of local wind direction and speed in Kunming caused the cumulative contribution of dust to the concentration of TGM.
作者
韩新宇
杜桂鑫
卢秀青
陈缘奇
史建武
HAN Xinyu;DU Guixin;LU Xiuqing;CHEN Yuanqi;SHI Jianwu(Faculty of Architectural Engineering,Kunming University of Science and Technology,Kunming Yunnan 650500;Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650500)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2020年第9期1067-1074,共8页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.21567012、No.21667014)。
关键词
气态总汞
新城区
浓度特征
排放源
total gaseous mercury
new urban area
concentration characteristics
emission source
