西北四城镇大气粉尘重金属元素研究

受自然环境和人为因素影响，我国西北地区城市大气中含有较多粉尘、粉尘听 重金属元素被人体吸收后，可导致一系列疾病，通过对四典型城镇的降尘采样，发现工业发达，人口稠密城市的粉尘有毒重金属元素含量高；工业不发达的小城镇粉尘有毒重金属元素含量低。西北城镇粉尘主要有毒重金属元素是铅与砷。机动车、燃煤烟尘及工业粉尘是西北城镇大气粉尘有毒重金属元素的主要来源。

HEAVY ELEMENTS IN AEROSOL OF FOUR URBAN AREAS IN THE NORTHWEST OF CHINA

Under the arid condition and human impact,the urban areas in the northwest of Chine have a higher areosol content than other places.Some anthropogenic heavy elements in the urban areosol are poisonous to the local inhabitants.In the spring of 1994 dust samples were taken from four urban areas in the northwest of China.It is found that the level of toxic heavy elements is higher in the industrial and populous cities and lower in the small towns.The dominant toxic heavy elements in the urban areoslo of arid hand of China are lead and arsenic.Automobile exhaust,coal combustion and industrial emission are the main sources of toxic heavy elements in the urban areosol.