【作者】 包良满； 李晓林； 张元勋； 曾建荣； 龙时磊； 李燕； 刘卫； 张桂林； 马陈燕；

【Author】 BAO Liang-man~1,LI Xiao-lin~1,ZHANG Yuan-xun~1,Zeng Jian-rong~1,LONG Shi-lei~1,LI Yan~1, LIU Wei~1,ZHANG Gui-lin~1,MA Chen-yan~2 1.Shanghai Institute of Applied Physics,the Chinese Academy of Sciences,Shanghai 201800, 2.Institute of High Energy Physics,the Chinese Academy of Sciences,Beijing 10049

【机构】 中国科学院上海应用物理研究所； 中国科学院高能物理研究所；

【摘要】 采集了上海地铁某站台室内大气中28nm～9.92μm粒径范围的颗粒物样品,用同步辐射X射线吸收近边结构谱（XANES）对样品中Fe和S的化学种态进行了研究。结果表明,地铁站台内PM₁₀和PM_2.5的质量浓度远高于室外。PM₁₀浓度超过了中国室内空气质量标准,PM_2.5浓度远高于美国EPA的标准限制。地铁站台颗粒物中Fe的化学种态不同于室外颗粒物。在粗颗粒物中,Fe主要以Fe及低价Fe的氧化物形态存在,在超细颗粒物中,Fe主要以硫酸铁形态存在。随着粒径的减小,Fe的氧化态增加。硫酸盐是地铁站台室内颗粒物S的主要种态,除此之外,在粗颗粒和超细颗粒物中还存在部分低价的硫化物。更多还原

【Abstract】 The size-fractionated airborne particles were collected on the platform of a metropolitan underground railway station in central Shanghai.Synchrotron radiation technique of X-ray Absorption Near-Edge Structure Spectroscopy（XANES） was employed to analyze particles.The concentrations of PM₁₀ and PM_2.5 were significantly higher than those of outdoor.The results showed that indoor PM₁₀ levels exceeded the China indoor air quality standard i.e.150μg/m³. Moreover,the concentration of PM_2.5 was found to be much higher than the ambient air quality standard to PM_2.5 promulgated by United States Environmental Protection Agency（US-EPA）（24 harithmetic mean:35μg/m³）.The chemical state of iron in particles in underground railway station was quite different from that of outdoor.In coarse particles,Fe mainly existed as iron oxide.While in ultrafine particles,iron sulphate was the dominant iron species.The oxidation state of iron species increased with decreasing grain sizes.Sulphate was the dominant form of sulfur in both coarse and fine particles.In addition,a small amount of sulfur was also present as metal sulfide in coarse and ultrafine particles.更多还原