Abstract
The present study reported simultaneous measurements of particle number concentration (PNC), particle mass concentration, water soluble organic carbon (WSOC), organic carbon (OC), elemental carbon (EC), particulate morphology and main elemental properties. The measurements were conducted in a museum located in the downtown area of Shanghai. The impacts of storey, particle size and decorative flooring on particle characteristics inside museum were investigated. Size fractionated PNC in display halls belonging to the same storey exhibited similar daily variations. Particles within the range of 0.3-0.5 µm were identified as the most significant contributors to the overall size distribution measured, as ambient fine particles penetrated through the mechanical ventilation system. Multi-lognormal fitting OC concentrations can be assigned to the presence of tourists in the museum or originate from secondary OC formation. The latter can be estimated by comparing the relationship between OC and EC, as well as OC and WSOC.
Highlights
Airborne particulate matter has become one of the most urgent issues in China
The present study reported simultaneous measurements of particle number concentration (PNC), particle mass concentration, water soluble organic carbon (WSOC), organic carbon (OC), elemental carbon (EC), particulate morphology and main elemental properties
It was found that the concentration of large particles started to decrease at about 16:20, indicating that the large size particle concentration was significantly affected by the presence of tourists inside the museum
Summary
It has negative impacts to human health and the environment, and influences the quality and durability of various materials. Under such circumstances, museum protection confronts the challenge of the sustainable management and inheritance. Under the circumstance of cultural relic being exposed to a low concentration of particulate matter or experienced only a short period of exposure, the damage on the cultural relic cannot be observed, but obvious effects such as surface alteration, color change or even weakening of the material may occur after a relative longer of time period (Vallero, 2007). Small particles remain suspended in the air until being trapped or held down on certain surfaces by means of electrostatic attraction as well
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