Size distributions of fine and ultrafine particles in the city of Strasbourg: correlation between number of particles and concentrations of NO(x) and SO(2) gases and some soluble ions concentration determination.
Size distributions of fine and ultrafine particles in the city of Strasbourg: correlation between number of particles and concentrations of NO(x) and SO(2) gases and some soluble ions concentration determination.
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DOI：
10.1016/j.jenvman.2006.12.022
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发表时间：
2008
影响因子：
8.7
通讯作者：
E. Roth;D. Kehrli;K. Bonnot;G. Trouvé
中科院分区：
文献类型：
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作者：
E. Roth;D. Kehrli;K. Bonnot;G. Trouvé
2003年春季和秋季，在斯特拉斯堡中心使用了一个电低压冲击器（ELPI）来测量大气气溶胶的大小分布。用专用分析仪同时测定空气中nox和so2的浓度。样品的等效气动直径范围为0.007 ~ 10μm。数量分布代表了来自城市交通的污染，其粒径分布表现为29nm以下的成核模式和80nm左右的累积模式。在春季采样2周后，平均颗粒密度为39000±35000个/ cm3，粒径范围为7 ~ 10μm。86.9%的颗粒气动直径小于0.1μm， 13.1%的颗粒气动直径在0.1 ~ 1μm之间。各ELPI板上撞击颗粒数与气体浓度（so2和NOx）的相关系数表明，直径在0.10 ~ 0.62μm之间的颗粒数与NOx浓度高度相关。不同地点的测量结果表明，nox主要由汽车排放，这表明颗粒物是由交通引起的。颗粒与二氧化硫浓度的相关性不太明显。秋季取样2周的不同ELPI板上的颗粒分析表明，可溶性NO3−、SO42−和NH4+离子水平较高。在0.1 ~ 1μm的颗粒范围内，这三种物质的重量均达到90%。高浓度的nox有利于颗粒nh4no3的形成，从而诱导气态HNO3的形成。
An Electrical Low Pressure Impactor (ELPI) was used during spring and autumn 2003 in the centre of Strasbourg for the measurement of atmospheric aerosols size distribution. The concentration of NOxand SO2in air was simultaneously measured with specific analysers. Samples were collected in the range 0.007–10μm in equivalent aerodynamic diameter size. Number distributions are representative of a pollution originating from urban traffic with a particle size distribution exhibiting a nucleation mode below 29nm and an accumulation mode around 80nm in size. A mean particle density equal to 39000±35000 total particles per cm3with a size ranging from 7 to 10μm was obtained after a sampling period of 2 weeks in spring. About 86.9% of the number of particles have an aerodynamic diameter below 0.1μm and 13.1% between 0.1 and 1μm. Correlation coefficients between the number of particles impacted on each ELPI plate and gas concentrations (SO2and NOx) showed that the numbers of particles with diameter between 0.10 and 0.62μm are highly related to the NOxconcentration. This result indicates that particles are traffic induced since NOxis mainly emitted by cars as shown by measurements on various sites. Particles are less clearly correlated to the SO2concentration. Particle analysis on different ELPI plates for a sampling period of 2 weeks in autumn showed high level of soluble NO3−, SO42−and NH4+ions. Indeed, up to 90% b.w. of these three species were found in the particle range 0.1–1μm. The formation of particulate NH4NO3is favoured by high NOxconcentration, which induces the formation of gaseous HNO3.