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华山地区PM_(2.5)中无机离子垂直分布特征
Authors
余兴[3]
刘浪[1,2]
+5 more
吴灿[1,2]
曹聪[1,2]
李建军[1]
李瑾[1,2]
王格慧[1]
Publication date
30 April 2018
Publisher
Doi
Cite
Abstract
2016年夏季在华山山腰及山脚设两个采样点(垂直高程相差约700 m),运用大流量采样器进行每4 h 1次PM_(2.5)样品采集,对其无机离子进行分析,探讨其浓度、组成、垂直变化、日变化及酸度的特征.结果表明:采样期间,华山山腰及山脚的PM_(2.5)分别为:(46.9 ± 38.2) μg·m ~(- 3)和(76.0 ± 44.3) μg·m ~(- 3),PM_(2.5)中无机离子分别为:(16.6 ± 15.7) μg·m ~(- 3)和(24.0 ± 15.0) μg·m ~(- 3).两个点位无机离子浓度依次为: SO_4~(2 -) > NO_3~- > NH_4~+ > Ca~(2 +). SO_4~(2 -) 、NO_3~- 、NH_4~+为主要组分,占华山山腰及山脚大气PM_(2.5)总离子质量浓度的89 %和85%.线性回归分析显示: PM_(2.5)中的NH_4~+在华山山腰主要以(NH_4)_2 SO_4和NH_4NO_3的形式存在,而在华山山脚主要以NH_4HSO_4和NH_4NO_3的形式存在.华山山腰和山脚PM_(2.5)及其离子呈现出不同的日变化特征:山腰在12: 00 ~ 16: 00出现峰值,主要是因为边界层抬升和山谷风输送地表污染物的缘故;山脚则分别在白天08: 00 ~ 12: 00和夜晚00: 00 ~ 04: 00出现双峰值,这主要是由于早高峰交通排放增加和夜间大型载货卡车流量增大所致.利用阴阳离子当量平衡法及ISORROPIA Ⅱ模型进一步探讨了PM_(2.5)酸度特征,结果表明:华山山脚PM_(2.5)的酸度(pH = 2.9 ± 2.0)强于山腰(pH = 3.2 ± 2.3).</p
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Last time updated on 07/01/2019