کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4409357 1307479 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
VUV photolysis of naphthalene in indoor air: Intermediates, pathways, and health risk
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
VUV photolysis of naphthalene in indoor air: Intermediates, pathways, and health risk
چکیده انگلیسی

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 2.81 min, while the mineralization of VOCs led to a sharp decline of η to 28 after VUV irradiation of 7.01 min. 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.

Figure optionsDownload as PowerPoint slideHighlights
► NP was converted to new SVOCs via functionalization by oxidative radicals.
► Five SVOCs in oil phase condensing from aerosol were discerned by GC–MS.
► Thirteen gaseous VOCs in five categories were determined by PTR-MS.
► NP can be eliminated by condensation and mineralization.
► Health risk assessment of VUV photolysis of NP was conducted.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 91, Issue 7, May 2013, Pages 1002–1008
نویسندگان
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