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Characterization of Particulate Matter, Ions and OC/EC in a Museum in Shanghai, China

Category: Aerosol and Atmospheric Chemistry

Volume: 15 | Issue: 4 | Pages: 1240-1250
DOI: 10.4209/aaqr.2014.07.0147
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Guangli Xiu 1, Xin Wu1, Lina Wang1, Yuanxiang Chen1, Ying Yu1, Fangyuan Xu2, Laiming Wu2

  • 1 State Environmental Protection Key Laboratory of Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
  • 2 Key Scientific Research Base of Museum Environment, State Administration for Cultural Heritage, Shanghai Museum, Shanghai, China

Highlights

The influence of visitors was compared.
The particle decay rate was calculated.
The particle composition and OC/EC was investigated.


Abstract

The size-fractionated particle number concentrations were monitored continuously in the different exhibition halls of an enclosed museum, in Shanghai. Particles in different size bins were collected to investigate the main chemical compositions. Results indicated that the mass concentrations of coarse particles, fine particles and ultrafine particles were in the range of 20.50–24.38 μg/m3, 23.39–24.08 μg/m3 and 16.02–17.48 μg/m3, respectively. In addition, the activities of cleaning and walking can greatly elevate the number concentration of coarse particles by a factor of about 8–172 times. The decay rates of size-fractionated particle increased with the enlarging particle diameter, ranging from 2 × 10–5 to 8 × 10–4 s–1. The mass concentration of SO42–, NO3, NH4+ peaked within the particle size range of 0.32–0.56 μm. The ratios of [NO3]/[SO42–] on the National Day and working day were 0.08 and 0.12, respectively. Comparatively, the peak concentrations of Na+, Cl, K+, Mg2+ and Ca2+ occurred in the various size ranges. Total organic acids distributed uniformly, the acetate ion mass concentration was 1.238 μg/m3, which was higher than both formate ion and oxalate ion concentrations. The concentrations of OC and EC showed similar trends on both the National Day and working day, and greater OC/EC ratios were found in the particles within the size range less than 0.1 μm and larger than 1 μm.

Keywords

Museum Particulate matter Number concentration Water-soluble ions Size distribution


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