Characterization of chemical species in PM2.5 and PM10 aerosols in Hong kong
Characterization of chemical species in PM2.5 and PM10 aerosols in Hong kong
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DOI：
10.1016/s1352-2310(02)00804-x
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发表时间：
2003-01-01
影响因子：
5
通讯作者：
Yao, XH
中科院分区：
文献类型：
--
作者：
Ho, KF;Lee, SC;Yao, XH
在2000年11月至2001年2月的冬季期间，我们在香港三个不同的采样点采集了PM10和PM2.5的气溶胶样本。PM10和PM2.5的采集采用高容量(hi-vol.)对采样器和主要元素、离子、有机碳和元素碳的浓度进行了量化。理大校园和观塘的PM2.5/PM10比率分别为0.61和0.78。这些结果表明，PM2.5浓度对PM10组分的贡献最大。在市区量度的PM10和PM(2.5)中的人为物种(例如铅和铜)的浓度，一般较市区本底地点(鹤嘴、夏洛特)为高。三个监测点的硫酸盐主要是非海盐(NSS)硫酸盐。虽然HT位于沿海地区，但海盐对细颗粒物中硫酸盐的贡献很小，表明有相当大的人为成因。理大和葵涌PM10和PM2.5监测站的OC/EC比率均小于2。然而，对于PM10和PM2.5，OC/EC的比值都在3以上。这表明存在二次有机气溶胶。利用两个季节的有机碳与有机碳、有机碳与硫酸盐的相关关系，证明东北地区有机污染物的大气输送转化是冬季有机污染物的主要来源。根据观察到的元素组成重建了样品的化学成分。这7种物质，即地壳物质、海盐、铵盐、硫酸盐、硝酸盐、元素碳和有机物，分别占市区(理大和九龙)PM10和PM2.5的77-84%和鹤咀的74%。硫酸盐、有机质和元素碳是颗粒物中的主要成分，特别是在理大和科大采集的PM2.5中。HTPM10的主要成分是海盐和硫酸盐。(C)2002爱思唯尔科学有限公司。保留所有权利。
Aerosol samples for PM10 and PM2.5 were collected in wintertime from November 2000 to February 2001 at three different sampling locations in Hong Kong. PM10 and PM2.5 were collected by high-volume (hi-vol.) samplers and the concentrations of major elements, ions, organic and elemental carbons were quantified. The ratios Of PM2.5/PM10 were 0.61 and 0.78 at the PolyU campus and Kwun Tong (KT), respectively. These results indicated that the concentrations of PM2.5 contribute the majority of the PM10 fraction. The concentrations of anthropogenic species (e.g. Pb and Cu) in PM10 and PM(2.5)measured at urban areas were generally higher than at an urban background site (Hok Tsui, HT). The major fractions of sulfate at three monitoring sites are non-sea-salts (nss) sulfates. Although HT is located in coastal areas, the contribution of sea salts to sulfate in fine particles was small, indicating a substantial anthropogenic origin. The OC/EC ratios were less than 2 in PolyU and KT monitoring stations for PM10 and PM2.5. However, the OC/EC ratios were over 3 at FIT for both PM10 and PM2.5. This indicates the presence of secondary organic aerosols. Correlations between OC and EC as well as OC and sulfate in HT during both seasons were used to prove that atmospheric transport and transformation of anthropogenic organic species from northeastern area was the dominant source in winter. The chemical composition of the samples was reconstructed from the observed elemental composition. The contribution of the seven components, namely crustal matter, sea salt, ammonium, sulfate, nitrate, elemental carbon and organic matter accounted for 77-84% of the PM 10 and PM2.5 mass in the urban area (PolyU and KT) and 74% for Hok Tsui (HT). Sulfate, organic matter and elemental carbon are the major constituents in particles especially in PM2.5 collected at PolyU and KT. The major constituents of PM10 in HT are sea salt and sulfate. (C) 2002 Elsevier Science Ltd. All rights reserved.