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VUV photolysis of naphthalene in indoor air: Intermediates, pathways, and health risk.
Chemosphere. 2013 May; 91(7):1002-8.C

Abstract

To evaluate the health risk of vacuum ultraviolet (VUV) photolysis of naphthalene (NP) in indoor air, intermediates were detected by gas chromatograph-mass spectrometry and proton transfer reaction-mass spectrometry. Results showed that 13 volatile organic compounds (VOCs) in gas phase and five semi-volatile organic compounds (SVOCs) in oil phase were the main intermediates. VUV photolysis pathways of NP can be divided into five stages including functionalization, partition, condensation, fragmentation, and mineralization. Initially NP was converted into several SVOCs via functionalization by oxidative radicals. SVOCs with high boiling points and polarity groups would partition between aerosol and gas phase. Certain amount of SVOCs in aerosol phase were transformed to oily substances by condensation, which can be washed out by conventional gas washing technique like wet scrubber easily. A majority of SVOCs in gas phase were converted to VOCs by fragmentation, which can be further mineralized into CO2. The accumulation of VOCs, especially highly harmful aldehydes, resulted in an increase of health risk influence index (η) to 150 after VUV irradiation of 2.81min, while the mineralization of VOCs led to a sharp decline of η to 28 after VUV irradiation of 7.01min. It can be concluded that the mineralization of VOCs is a key factor to alleviate the health risk of photolysis. The results will guide a safe and economical application of VUV photolysis technology in indoor air purification.

Authors+Show Affiliations

Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. weirong@mail.hz.zj.cnNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23461839

Citation

Zhao, Weirong, et al. "VUV Photolysis of Naphthalene in Indoor Air: Intermediates, Pathways, and Health Risk." Chemosphere, vol. 91, no. 7, 2013, pp. 1002-8.
Zhao W, Yang Y, Dai J, et al. VUV photolysis of naphthalene in indoor air: Intermediates, pathways, and health risk. Chemosphere. 2013;91(7):1002-8.
Zhao, W., Yang, Y., Dai, J., Liu, F., & Wang, Y. (2013). VUV photolysis of naphthalene in indoor air: Intermediates, pathways, and health risk. Chemosphere, 91(7), 1002-8. https://doi.org/10.1016/j.chemosphere.2013.01.086
Zhao W, et al. VUV Photolysis of Naphthalene in Indoor Air: Intermediates, Pathways, and Health Risk. Chemosphere. 2013;91(7):1002-8. PubMed PMID: 23461839.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - VUV photolysis of naphthalene in indoor air: Intermediates, pathways, and health risk. AU - Zhao,Weirong, AU - Yang,Yanan, AU - Dai,Jiusong, AU - Liu,Feifei, AU - Wang,Yan, Y1 - 2013/02/22/ PY - 2012/08/19/received PY - 2013/01/09/revised PY - 2013/01/21/accepted PY - 2013/3/7/entrez PY - 2013/3/7/pubmed PY - 2013/9/21/medline SP - 1002 EP - 8 JF - Chemosphere JO - Chemosphere VL - 91 IS - 7 N2 - To evaluate the health risk of vacuum ultraviolet (VUV) photolysis of naphthalene (NP) in indoor air, intermediates were detected by gas chromatograph-mass spectrometry and proton transfer reaction-mass spectrometry. Results showed that 13 volatile organic compounds (VOCs) in gas phase and five semi-volatile organic compounds (SVOCs) in oil phase were the main intermediates. VUV photolysis pathways of NP can be divided into five stages including functionalization, partition, condensation, fragmentation, and mineralization. Initially NP was converted into several SVOCs via functionalization by oxidative radicals. SVOCs with high boiling points and polarity groups would partition between aerosol and gas phase. Certain amount of SVOCs in aerosol phase were transformed to oily substances by condensation, which can be washed out by conventional gas washing technique like wet scrubber easily. A majority of SVOCs in gas phase were converted to VOCs by fragmentation, which can be further mineralized into CO2. The accumulation of VOCs, especially highly harmful aldehydes, resulted in an increase of health risk influence index (η) to 150 after VUV irradiation of 2.81min, while the mineralization of VOCs led to a sharp decline of η to 28 after VUV irradiation of 7.01min. It can be concluded that the mineralization of VOCs is a key factor to alleviate the health risk of photolysis. The results will guide a safe and economical application of VUV photolysis technology in indoor air purification. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/23461839/VUV_photolysis_of_naphthalene_in_indoor_air:_Intermediates_pathways_and_health_risk_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(13)00215-4 DB - PRIME DP - Unbound Medicine ER -