攀枝花市大气污染物降水清除机制的研究

STUDY OF ATMOSPHERIC POLLUTANTS CLEARING MECHANISM BY PRECIPITATION IN PANZHIHUA INDUSTRIAL DISTRICT

本文采用了主成份分析及因子分析的方法,研究了影响降水pH值的主要源及其贡献和这些源被降水清除的机制。分析结果表明:大气中一次污染物是影响降水pH及各种成分浓度的主要因素。人为污染源包括高排放源、低排放源和汽车源,它们的排放物以碱性物质为主;自然污染源包括输送物、腐烂物、自然NOx等,它们的排放物主要是酸性物质;在一般情况下,降水的pH值取决于高、低排放源排放的碱性物质的多寡;降水量越大,清除的污染物越多,在雨季各测点降水平均pH值为6.31～7.10。在高排放源影响小的地方,对持续时间长的大雨,降水后期的pH能反映自然源的影响,其值小于5.60。可见,攀枝花市酸雨几率极低甚至降水呈碱性,

Employing methods of principal component and factor analysis, the main sources influencing precitation's pH,their contributions and the clearing mechanism by precipitation are studied in this paper. The results show that the artificial pollutants emitted by factories and automobiles are the main influencing factors, they are mainly basic in chemical nature. Natural sources including transported matters by monsoon, nitric oxides emitted by nature, etc, are acidic, their effect may be shown only in the late period of long-lasting heavy rain, so the acid rain rarely happens in Panzhihua industrial district.