Study on the Dry and Wet Atmospheric Deposition in the Urban Area of Tianjin
-
摘要: 为了研究天津市城区大气中各种元素的赋存和迁移转化特征,开展了为期一年的大气干湿沉降物质采集及相关研究工作。研究结果显示:1)大气干湿沉降物中Cd、Hg、Zn、S等元素质量分数为土壤背景值10倍以上;2)燃煤是天津市大气干湿沉降物的重要来源;3)大气干湿降尘量以及各元素质量分数与周边的环境密切相关,工业区沉降物质中重金属元素含量更高;4)通过模型计算可知大气干湿沉降会显著改变表层土壤中的元素含量,也证明大气干湿沉降是城区及近郊的土壤重金属富集的重要原因。Abstract: In order to find out how the elements host and transfer in the air of Tianjin urban area, we carried out a annual sample collection of dry and wet atmospheric deposit and subsequent study based the data. The results show: (1)the concentration of Cd, Hg, Zn, S in dry and wet atmospheric deposit is more than 10 times of the back-ground concentration.(2)Coal combustion is important source of dry and wet atmospheric deposit.(3)deposit weight and elements concentration in it have high correlation with nearby environment, the heavy metal concen-tration of deposit in industry area is much higher than others.(4) we found out that dry and wet atmospheric depo-sition would change the elements concentration of top soil remarkably based on modeling and calculation, which also confirm the deposition is important cause of heavy metal accumulation in urban and suburb soil of Tianjin.
-
Key words:
- dry and wet atmospheric deposition /
- Tianjin /
- geochemistry
-
-
计量
- 文章访问数: 264
- PDF下载数: 14
- 施引文献: 0
下载: