| 乌鲁木齐道路扬尘PM2.5粒度乘数特征 |
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| 引用本文： | 王士宝,姬亚芹,张伟,张蕾,赵静琦,李越洋.乌鲁木齐道路扬尘PM2.5粒度乘数特征[J].环境科学研究,2018,31(7):1201-1206. |
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| 作者姓名： | 王士宝 姬亚芹 张伟 张蕾 赵静琦 李越洋 |
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| 作者单位： | 1.南开大学环境科学与工程学院, 天津 300350 |
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| 基金项目： | 大气重污染成因与治理攻关项目（No.DQGG0201） |
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| 摘 要： | 粒度乘数用来表征道路扬尘中不同粒径颗粒物的分布情况，是构建道路扬尘排放清单的一个重要参数，直接影响排放清单的不确定性.2016年5—6月采用样方吸尘法采集乌鲁木齐市不同区域、不同类型道路积尘样品，通过再悬浮和便携式气溶胶粒径谱仪（Grimm1.109）分析得到样品的粒径数据，并利用校正公式计算得到道路扬尘K2.5（PM2.5粒度乘数）.结果显示:快车道K2.5中位值为0.079 g/VKT，略大于慢车道（0.074 g/VKT），非参数检验结果P=0.56（>0.05），表明两种车道之间K2.5差异无统计学意义；次干道、高速路、支路、主干道、快速路、环线、省道、县道和国道的道路扬尘K2.5范围分别为0.083~0.112、0.063~0.093、0.055~0.154、0.047~0.107、0.065~0.090、0.697~0.090、0.060~0.080、0.046~0.118和0.051~0.069 g/VKT，这与车流量、车速和平均车质量等因素有关；K2.5中位值存在区域差异，天山区最大（0.091 g/VKT），其次是米东区（0.083 g/VKT）、水磨沟区（0.082 g/VKT）和头屯河区（0.081 g/VKT），乌鲁木齐县最小（0.064 g/VKT），利用单因素方差分析对其差异显著性进行检验，结果为P=0.107（>0.05），表明不同区域间K2.5中位值无显著性差异.乌鲁木齐市各地区道路扬尘K2.5中位值（0.064~0.091 g/VKT）小于美国AP-42中推荐的经验参数（0.15 g/VKT）.研究显示，在建立乌鲁木齐市道路扬尘排放清单时，若直接采用美国AP-42推荐值，会加大排放清单的不确定性，因此需要通过校正公式对道路扬尘K2.5进行校正，获得本地化粒度乘数值.
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| 关 键 词： | 乌鲁木齐市 道路扬尘 PM2.5 粒度乘数 排放清单 |
| 收稿时间： | 2017/9/28 0:00:00 |
| 修稿时间： | 2018/3/24 0:00:00 |
PM2.5 Particle Size Multiplier Feature of Road Dust in Urumqi City |
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| WANG Shibao,JI Yaqin,ZHANG Wei,ZHANG Lei,ZHAO Jingqi and LI Yueyang.PM2.5 Particle Size Multiplier Feature of Road Dust in Urumqi City[J].Research of Environmental Sciences,2018,31(7):1201-1206. |
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| Authors: | WANG Shibao JI Yaqin ZHANG Wei ZHANG Lei ZHAO Jingqi and LI Yueyang |
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| Affiliation: | 1.College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China2.State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin 300350, China |
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| Abstract: | The particle size multiplier, which is used to characterize the particle size distribution in road dust, is an important parameter for constructing road dust emission inventory, and affects the uncertainty of emission inventory directly. Samples were collected from different types of road in Urumqi City by quadrat sampling method from May to June, 2016. The particle size data of the samples were obtained by resuspension equipment and portable aerosol particle size spectrometer Grimm1.109, then the values of particle size multiplier for PM2.5 (K2.5) in road dust were calculated by the correction formula. Results showed that the median value of K2.5 in the fast lane (0.079 g/VKT) was slightly larger than the slow lane (0.074 g/VKT). The result of nonparametric test P=0.56 (>0.05) indicated that there was no statistical significance between two lanes. The range of K2.5 in road dust of minor arterial, expressway, collector road, major arterial, freeway, the outer ring, provincial road, county road, and national road were 0.083-0.112, 0.063-0.093, 0.055-0.154, 0.047-0.107, 0.065-0.090, 0.697-0.090, 0.060-0.080, 0.046-0.118 and 0.051-0.069 g/VKT, respectively, which was mainly affected by the factors such as vehicle flow, speed, average weight of the car and so on. The value of K2.5 in different regions showed that Tianshan District was the largest (0.091 g/VKT), followed by Midong District (0.083 g/VKT), Shuimogou District (0.082 g/VKT) and Toutunhe District (0.081 g/VKT), and Urumqi County was the smallest (0.064 g/VKT) one, indicating that there were differences in different regions. The one-way ANOVA was used to test the differences, and the result was P=0.107 (>0.05), indicating that there was no significant difference between different regions. The median value of K2.5 in road dust in Urumqi City ranged from 0.064 to 0.091 g/VKT, which was less than the recommended empirical parameter (0.15 g/VKT) in the US AP-42. When establishing the emission inventory of road dust in Urumqi, if the recommended value of the US AP-42 is adopted directly, it would increase the uncertainty of the emission inventory. Therefore, it is necessary to correct the road dust K2.5 through the correction formula and obtain the localized size multiplication value. |
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| Keywords: | Urumqi City road dust PM2 5 particle size multiplier emission inventory |
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