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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/32634

    標題: Nano/micron particles released from newspapers under different reading conditions
    作者: Sopajaree, Khajornsak
    Ying I. Tsai(蔡瀛逸)
    Yen, Yu-Hsuan
    貢獻者: Chiang Mai Univ, Dept Environm Engn
    Chia Nan Univ Pharm & Sci, Dept Environm Engn & Sci
    Chia Nan Univ Pharm & Sci, Indoor Air Qual Res & Serv Ctr
    關鍵字: Printed newspaper
    Indoor air quality
    Particle number
    Number size distribution
    日期: 2019-01
    上傳時間: 2020-07-29 13:53:05 (UTC+8)
    摘要: Despite the extensive use of the Internet, printed newspapers remain a primary information source. In this study, reading a newspaper in a relatively confined or poorly ventilated indoor space was simulated to determine the profile of particles released from the newspaper into the air. The consecutive simulated conditions were reading without agitation of the newspaper (NoAg), followed by reading with agitation of the newspaper (Ag) and postreading absent the newspaper (PostR), repeated with four newspapers. We found that particle number concentration (Sigma N) fell during Ag owing to electroadhesion of ultrafine particles (<200 nm) caused by static charges created by friction between the paper surface and the air as a result of newspaper agitation. Conversely, particle surface area concentrations (Sigma A) and particle volume concentrations (Sigma V) increased significantly during Ag. This was because the larger, fine (1-2.5 mu m) and coarse mode (2.5-10 mu m), particles were detached from the newspaper during agitation due to inertial detachment - the release of even a small number of these particles contributing greatly to Sigma A and Sigma V. The critical particle number diameter (CPND) occurred at 207-310 nm. Particles smaller than this were subject to electroadhesion during Ag. The critical particle volume diameter (CPVD) occurred at 130-497 nm. Particles larger than this were subject to inertial detachment during Ag. These observations indicate that the electroadhesion of smaller particles and the inertial detachment of larger particles occur simultaneously. Particle mass concentrations were found to be as high as 168.7-534.3 mu g m(-3). However, these findings of high potential concentrations were based on the measurement in relative small microenvironment. The inhalation of such concentrations is a health risk for people who regularly read newspapers in a relatively confined or poorly ventilated indoor space. (C) 2018 Elsevier B.V. All rights reserved.
    關聯: Science of the Total Environment, v.646, pp.1182-1194
    Appears in Collections:[環境工程與科學系(所)] 期刊論文

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