The chemical composition of PM2.5-10 and PM2.5 particles during Asian dust storm in southern Taiwan
- 作者：Chi-Fu YehChon-Lin Lee
- 会议时间：2012-03-01
- 关键词：PM2.5-10 ; PM2.5 ; Metallic elements ; Enrichment factor
- 作者单位：Department of Marine Environment and Engineering,Taiwan Sun Yat-Sen University 70 Lian-Hai Road,Kaohsiung 80424,Taiwan,R.O.C
- 母体文献：第九届海峡两岸气溶胶技术研讨会暨第二届海峡两岸环境保护双门论坛论文集
- 会议名称：第九届海峡两岸气溶胶技术研讨会暨第二届海峡两岸环境保护双门论坛
- 会议地点：厦门
- 主办单位：中国颗粒学会
- 语种：chi
摘要
Thirteen samples of PM2.5-10 (coarse) and PM2.5 (fine) were collected by Universal Air Sampler from February to March,2010 in Kaohsiung for investigating the impact of chemical composition of Asian dust storms (DS) and non-DS (NDS) in southern Taiwan.Based on back trajectories,two dust storm episodes were identified by different transport pathways.The analysis results were used to distinguish the behavior of metallic composition and particle size (coarse and fine particle fraction) between two DS (DSI and DSII) and NDS periods.During two DS episodes,metallic elements of Mn,Co,Al,Ca,Fe and Mg were significantly higher in concentrations of coarse fraction compared with NDS periods.The elemental ratios of DSI/NDS and DSII/NDS were from 3.1 to 3.9 and 9.0 to 28.2,respectively.Higher fraction in fine size particles was observed during NDS periods,while the coarse fraction contributed major mass during two DS episodes.The mass ratios (coarse particle/PM10) for NDS,DSI and DSII were approximately 29%,55% and 72%,respectively.Anthropogenic elements showed higher enrichment factor (EF) values during NDS periods,compared with two DS episodes.This may be ascribed to the excessive impact of crustal elements such as Al carried by two DS episodes.