深圳市大气颗粒物分粒径有效密度及影响因素

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Abstract In order to identify the characteristics of the particle effective density in Shenzhen and the influencing factors, we used a centrifugal particle mass analyzer (CPMA) combined with a differential mobility analyzer (DMA) to simultaneously measure the size-resolved effective density of particles of 50to 500nm at an urban site from September 2020 to February 2021. The median effective density ranged from 1.29 to 1.53g/cm³, increasing with the particle diameter, and the effective density in autumn was slightly lower than that in winter. During the clean period, the effective density of particles was low and a bimodal distribution was observed. The median effective density of a low-density mode was in the range of 0.70~0.80g/cm³, indicating the presence of fresh soot particles. While the median effective density of a high-density mode was in the range of 1.3~1.5g/cm³, which was between the material densities of secondary inorganic particles and organic particles, indicating mixing of them. During the polluted period, the effective density at different particle sizes increased and showed a unimodal distribution, which was a result of internal mixing. In the event of new particle formation, nitrate condensation was found to be the main reason for the subsequent increase in particle size and effective density.

Key words： effective density size distribution chemical composition aging process

Received: 15 September 2021

PACS:

X703.5

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	Articles by authors
	ZHENG Jin-yi
	PENG Yan
	WEI Jing
	GUO Song
	HE Ling-yan
	HUANG Xiao-feng

Cite this article:

ZHENG Jin-yi,PENG Yan,WEI Jing等. Study on effective density of size-resolved particles and the influencing factors in Shenzhen[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1526-1533.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1526

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