摘要
以长春市城区为研究对象,收集了近10年的降尘资料,揭示了长春市降尘量的变化趋势.采集了2006年10月~2007年2月的降尘样品,对其进行了粒度与元素分析.结果表明,10年来长春市降尘量总体变化呈波动下降趋势,每年二季度的降尘量比例大,三季度空气质量相对较好;采暖期和非采暖期大气降尘的元素组成差异不大,Al,Fe,Ca为长春市大气降尘的主要元素;各采样点的粒度分布曲线形态很相似,且为三峰或四峰,降尘的搬运方式是以跃移为主,说明其来自于周边地区,且主要是风力和人为活动所致.
Changchun City was taken as the study area in this work.The data on dustfall about 10 years were collected,and the change tendency of dustfall was disclosed.Dustfall samples from Oct.2005 to Feb.2006 and samples of pollution sources were also collected.The samples were measured and analyzed by particle size analyzer and ICP-AES.The data of dustfall in recent 10 years showed that the mainly change trend of dustfall in Changchun fluctuatedly descended.Dustfall was much in the second quarter and there was the best atmosphere quality in the third quarter of year.Content of 10 elements(As,Ca,Cu,Mg,Zn,Fe,Al,Ti,Mn,Pb) and samples of pollution sources were measured by ICP-AES.Combined with the formerly research there was little difference in element composition in heating period and non-heating period.The main elements of dustfall in Changchun City were Al,Fe and Ca.The result of particle analysis showed that the size distribution curves of all the sample locations were similar and there were three peaks or four peaks.The convey mode of dustfall was saltation,so the dustfall came from the surrounding region,and were caused by wind force and human activities.
出处
《过程工程学报》
CAS
CSCD
北大核心
2009年第S2期218-224,共7页
The Chinese Journal of Process Engineering
关键词
大气降尘
元素特征
粒度特征
长春市
atmosphereic dustfall
characters of element composition
characters of particle size
Changchun City
