Lung deposited surface area of atmospheric aerosol particles at three observatories in Japan
Lung deposited surface area of atmospheric aerosol particles at three observatories in Japan
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DOI：
10.1016/j.atmosenv.2021.118597
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发表时间：
2021-10
影响因子：
5
通讯作者：
Kazuki Kurihara;Ayumi Iwata;Miho Kiriya;A. Yoshino;A. Takami;A. Matsuki;C. Nishita-Hara;K. Hara;M. Hayashi;N. Kaneyasu;T. Seto;Y. Fujitani;Koji Funato;Kôzô Inoue;T. Okuda
中科院分区：
文献类型：
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作者：
Kazuki Kurihara;Ayumi Iwata;Miho Kiriya;A. Yoshino;A. Takami;A. Matsuki;C. Nishita-Hara;K. Hara;M. Hayashi;N. Kaneyasu;T. Seto;Y. Fujitani;Koji Funato;Kôzô Inoue;T. Okuda
通过扩散充电（DC）方法测量的肺沉积表面积（LDSA）最近已经受到越来越多的关注，因为它被认为准确地表示颗粒（包括超细颗粒）的表面反应性。为了表征LDSA在大气中的区域和季节行为及其控制因素，我们测量了LDSA浓度，使用DC方法，和其他理化性质在日本的三个地点，包括城市和农村地区。在同一个季节的三个站点之间的比较表明，最高的LDSA浓度在城市站点福冈，由于高浓度和低粒径。此外，该城市站点经常记录高LDSA浓度与高特定的LDSA，这代表了超细颗粒物对LDSA浓度的高贡献。这是因为该地点主要由周围城市排放的超细黑碳颗粒组成，沿着来自大陆的长距离传输颗粒的贡献很低。相比之下，这些输送颗粒，这是典型的观察在这三个网站在本赛季中，导致特定的LDSA落在一个低而窄的范围内的优势。然而，即使在农村地区，活跃的有机颗粒在夏季形成高特定的LDSA，虽然他们的浓度很低。因此，在城市地区的颗粒，超细颗粒物可能是从周围城市排放的高浓度，有可能对人体健康造成更大的不利影响，即使是相同的LDSA浓度。此外，我们的观察表明，用DC方法测量的大气气溶胶粒子的LDSA可以大致由假设为球形的粒子的理论LDSA来表示。我们使用特定的LDSAs的表征提供了有用的信息，应用LDSAs作为大气气溶胶颗粒物，包括超细颗粒物的毒性指示。
The lung deposited surface area (LDSA) measured by diffusion charging (DC) method has been recently receiving increased attention as it is believed to accurately represent the surface reactivity of the particles, including ultrafine particles. To characterize regional and seasonal behaviors of the LDSA in the atmosphere and the factors controlling them, we measured the LDSA concentrations, using the DC method, and other physicochemical properties at three sites in Japan, including urban and rural areas. Comparisons among the three sites in the same season showed the highest LDSA concentration at the urban site Fukuoka, due to high concentrations and low particle sizes. In addition, this urban site frequently recorded high LDSA concentrations with high specific LDSAs, which represents the high contribution of ultrafine particles to the LDSA concentration. This is because the site was dominated by ultrafine black carbon particles emitted from surrounding cities, along with low contribution of long-range transported particles from the continent. In contrast, the dominance of these transported particles, which is typically observed at the three sites during this season, caused the specific LDSA to fall within a low and narrow range. However, even at rural areas, the active formation of organic particles in the summer caused high specific LDSAs, although their concentrations were low. Thus, the particles in urban areas, where ultrafine particles are probably emitted with high concentration from surrounding cities, have the potential to cause a greater adverse effect on human health even for the identical LDSA concentration. In addition, our observations showed that the LDSA of atmospheric aerosol particles measured by the DC method can be roughly represented by the theoretical LDSA of particles assuming spherical shape. Our characterizations using the specific LDSAs provide useful information for applying the LDSAs as the toxicity indicator of atmospheric aerosol particles, including ultrafine particles.