摘要
大气颗粒物一直是西安市的主要污染物 ,多年监测的TSP日均浓度值均超过国家二级标准限值 1 50 μg/m3。 1 996年夏季在西安市南郊陕西省委党校设立监测点 ,使用步进式时间序列自动采样仪对当地空气颗粒物进行了 4天 2 4小时连续采样 ,使用PIXE对采到的 32个样品进行元素分析 ,每个样品分析出 1 4～ 1 6种元素。各种元素浓度随时间变化趋势基本一致 ,主要受气象条件的影响 ,降雨对空气颗粒物各元素浓度有明显抑制作用。富集因子分析表明 ,西安市空气颗粒物不仅受地壳物质的影响 ,还受到一定程度人为污染的影响。元素浓度的因子分析表明 ,西安市夏季颗粒物主要有 4种来源 :地壳物质、有色治炼、燃煤排放源和化工制药业。
Thirty-two aerosol samples were collected during July 27～30, 1996 at Dangxiao located in Xi′an southern suburban area The samples were analyzed by PIXE which results in 14 to 16 element concentrations Time series of element concentrations showed that their trends were similar, which indicated that pollutants emitted from local sources were mixed well in lower atmospheric boundary Abrupt turbulence often occurred around mid-night, which caused higher pollutant concentrations Enrichment analysis showed that atmospheric particle concentrations in Xi′an were not only influenced by crustal matters but also by man-made pollutants Factor analysis for element concentrations further indicated that there have four main sources influencing Xi′an atmospheric particle concentrations: (1) crustal matters; (2) metallurgical industry; (3) coal combustion; (4) chemical and pharmacy industry
出处
《气候与环境研究》
CSCD
2000年第1期51-57,共7页
Climatic and Environmental Research
基金
陕西省自然科学基金资助项目
