摘要
从珠江三角洲地区航测发现,直径小于1μm的气溶胶粒子每毫升可达几万到几十万个,这类小粒子能沉积在肺泡中,对人的健康危害较大,而它们对能见度影响较小。这类细粒子的来源,除排放源以外,气态污染物的转化也是细粒子二次污染的重要来源。野外烟雾箱模拟实验表明,珠江三角洲二氧化硫转化率最高达12.7％/小时,影响SO_2转化的因素是SO_2起始浓度、相对湿度和光照强度。经估算,珠江三角洲地区现有火电站与拟建火电站所排放的SO_2经转化,单是形成的硫酸盐细粒子(≤1μm)污染浓度,约为每毫升几万个,这是一个不容忽视的问题。对广州城市大气污染物有机无机成分的分析表明,就对人体健康而言,广州市气溶胶中有机成分的污染占主导地位。
It has been found that the density of the atmospheric aerosol particle (≤ 1μm) over the region of Zhujiang Delta. Ranged from ten thousands to hundred thousands a milliliter with airplane monitoring. This Kind of small particles could deposit to the pulmonary alveoli and there for is harmful to health. The particles were mainly from the transformation of gaseous pollutants besides from emission sources. The simulated experiment of photochemical smog chamber Showed that the maximum rate of sulphur dioxide transformation was 12.7%/h. The factors influenced the transformation rate of SO2 are initial SO2 concentration,relative humidity of air and light intensity. It also has been estimated that the density of small sulpha te particles ( ≦, 1 μm) transformed from the sulphur dioxide released by present and planned thermal power stations would be up to ten thousands a milliliter. Concerning the influence of pollutant on health in Guangzhou city,the organic composition inae-rosol played a leading role other then the inorganic composition.
出处
《环境科学研究》
EI
CAS
CSCD
1991年第1期21-36,共16页
Research of Environmental Sciences
