Characterization of atmospheric mineral components of PM2.5 in Beijing and Shanghai, China.
Characterization of atmospheric mineral components of PM2.5 in Beijing and Shanghai, China.
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DOI：
10.1016/j.scitotenv.2004.10.017
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发表时间：
2005-05
期刊：
影响因子：
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通讯作者：
Fumo Yang;B. Ye;K. He;Yong-liang Ma;S. Cadle;T. Chan;P. Mulawa
中科院分区：
文献类型：
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作者：
Fumo Yang;B. Ye;K. He;Yong-liang Ma;S. Cadle;T. Chan;P. Mulawa
在北京和上海一年内每周采集 PM2.5 样本，并对地壳元素进行分析，以研究环境细矿粉尘的浓度水平和时间变化。北京和上海的 Al、Si、Ca、Mg 和 Fe 质量浓度表现出相似的显着周变化。北京地区PM2.5主要地壳元素年均浓度范围为0.27 μg m−3Mg～2.48 μg m−3Si，是上海的1.40～2.24倍。两个城市的 PM 加权值相当。这些地壳元素存在明显的季节模式，北京春季浓度最高，上海冬季浓度最高，两个城市夏季浓度最低。 2000年北京多尘的春天，土壤灰尘是PM2.5第二大成分，贡献率高达18.6%，是冬季的两倍多。细土浓度（37.8 μg m−3）和质量百分比（41.6%）最高出现在北京强沙尘事件的同一周。沙尘暴的影响使北京减少PM2.5的目标变得更加复杂。建筑活动中产生的 Ca 似乎也是 PM2.5 的重要贡献者。
Weekly PM2.5samples were collected for one year in Beijing and Shanghai and the crustal elements analyzed to investigate the concentration levels and temporal variations of ambient fine mineral dust. The mass concentrations of Al, Si, Ca, Mg, and Fe exhibited similar significant weekly variations in both Beijing and Shanghai. The annual average PM2.5concentrations of major crustal elements ranged from 0.27 μg m−3Mg to 2.48 μg m−3Si in Beijing, which were 1.40–2.24 times higher than those in Shanghai. Their PM-weighted values were comparable between the two cities. A distinct seasonal pattern was present for these crustal elements with the highest concentrations during the spring in Beijing and during the winter in Shanghai, and the lowest concentrations during the summer in both cities. During the dusty spring of 2000 in Beijing, soil dust was the second most abundant PM2.5constituent with a contribution as high as 18.6%, over twice that in the winter. The highest fine soil concentration (37.8 μg m−3) and mass percentage (41.6%) occurred in the same week of intensive dust events impacting Beijing. The impact of dust storms complicates the goal of reducing PM2.5in Beijing. Ca originating from construction activities appears to be a significant PM2.5contributor as well.