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Secondary organic aerosol formation from p-dichlorobenzene under indoor environmental conditions
Abstract In indoor environments, the formation of secondary organic aerosols (SOAs) from gaseous volatile organic compounds (VOCs), which may have adverse health effects, has attracted attention. In particular, 1,4-dichlorobenzene (p-dichlorobenzene, p-DCB) is commonly used as a household insecticide in Japan, and its concentration may be high in indoor environments. Because p-DCB has highly reactive Cl groups, it is highly likely to be converted to SOAs under indoor environmental conditions. However, there have been no reports on the formation of SOAs from p-DCB. In this study, we investigated SOA formation from p-DCB gas under UV irradiation by volatilizing solid p-DCB and introducing it into a chamber as a gaseous substance, taking the influence of humidity and seed particles into account. Our results confirmed that SOAs, having a peak particle size of approximately 50 nm, were secondarily formed at a particle number concentration on the order of 1012 m−3. In addition, increased humidity and the coexistence of (NH4)2SO4 particles as seed particles further accelerated SOA formation. Furthermore, in an experiment with low-intensity UV irradiation under general indoor environmental conditions, we confirmed that SOAs were formed with a number concentration on the order of 1011 m−3, which is higher than the concentration in the general atmosphere. Therefore, an SOA formation reaction from p-DCB could occur at sufficient levels, even in general indoor environments.
Highlights Particle formation from p-dichlorobenzene (p-DCB) was investigated by a chamber. A high particle concentration was formed by irradiating the p-DCB gas with UV light. Particle formation accelerated with increasing humidity and (NH4)2SO4 particles. Particles formed from p-DCB gas even under low UV intensity conditions.
Secondary organic aerosol formation from p-dichlorobenzene under indoor environmental conditions
Abstract In indoor environments, the formation of secondary organic aerosols (SOAs) from gaseous volatile organic compounds (VOCs), which may have adverse health effects, has attracted attention. In particular, 1,4-dichlorobenzene (p-dichlorobenzene, p-DCB) is commonly used as a household insecticide in Japan, and its concentration may be high in indoor environments. Because p-DCB has highly reactive Cl groups, it is highly likely to be converted to SOAs under indoor environmental conditions. However, there have been no reports on the formation of SOAs from p-DCB. In this study, we investigated SOA formation from p-DCB gas under UV irradiation by volatilizing solid p-DCB and introducing it into a chamber as a gaseous substance, taking the influence of humidity and seed particles into account. Our results confirmed that SOAs, having a peak particle size of approximately 50 nm, were secondarily formed at a particle number concentration on the order of 1012 m−3. In addition, increased humidity and the coexistence of (NH4)2SO4 particles as seed particles further accelerated SOA formation. Furthermore, in an experiment with low-intensity UV irradiation under general indoor environmental conditions, we confirmed that SOAs were formed with a number concentration on the order of 1011 m−3, which is higher than the concentration in the general atmosphere. Therefore, an SOA formation reaction from p-DCB could occur at sufficient levels, even in general indoor environments.
Highlights Particle formation from p-dichlorobenzene (p-DCB) was investigated by a chamber. A high particle concentration was formed by irradiating the p-DCB gas with UV light. Particle formation accelerated with increasing humidity and (NH4)2SO4 particles. Particles formed from p-DCB gas even under low UV intensity conditions.
Secondary organic aerosol formation from p-dichlorobenzene under indoor environmental conditions
Komae, Sota (author) / Sekiguchi, Kazuhiko (author) / Suzuki, Megumi (author) / Nakayama, Ryoichi (author) / Namiki, Norikazu (author) / Kagi, Naoki (author)
Building and Environment ; 174
2020-02-21
Article (Journal)
Electronic Resource
English
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