Chia Nan University of Pharmacy & Science Institutional Repository:Item 310902800/1157
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 18074/20272 (89%)
造访人次 : 4078927      在线人数 : 1236
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧：
  • 您可在西文检索词汇前后加上"双引号"，以获取较精准的检索结果
  • 若欲以作者姓名搜寻，建议至进阶搜寻限定作者字段，可获得较完整数据
    •  进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://ir.cnu.edu.tw/handle/310902800/1157


    標題: 大氣硫物種及氮物種之氣/固化轉化特性研究
    作者: 蔡瀛逸
    貢獻者: 環境工程與科學系
    關鍵字: PM2.5 aerosols
    酸鹼性
    硫物種及氮物種
    氣/固化轉化
    日期: 2003
    上傳時間: 2008-06-26 15:52:49 (UTC+8)
    出版者: 台南縣：嘉南藥理科技大學環境工程與科學系
    摘要: The chemical composition and water content of atmospheric PM2.5 aerosols in a Tainan urban and coastal area were evaluated in January (winter) and April (spring) of 2002. Controlling relative humidity (RH) at 40±5 %, it was found that NH4+, SO4-2 and NO3- were the dominant water-soluble ionic species in both winter and spring. These accounted for an average 44.6% and 36.1% of PM2.5 mass at the urban site in winter and spring, respectively, and 44.6% and 38% at the coastal site, demonstrating that secondary aerosols were a larger part of the PM2.5 mass in winter at both sites. Utilizing the property of free-water methanol to extract aerosol water, water content was measured by GC-TCD and Karl Fischer methods. Detection limit by GC-TCD and Karl Fischer methods were 11µg and 10µg respectively. The water content (mass concentration) of atmospheric PM2.5 aerosols controlled at RH 602% and measured by Karl Fischer method was 31.3±8.4% and 38.0±7.2% at the coastal site in the daytime and nighttime, respectively, and 25.76±16.9% and 24.3±21.5% at the urban site. The water content was clearly higher in the coastal area in both winter and spring. Apart from urban winter, when daytime water content was slightly higher than nighttime, nighttime values were higher than daytime. Controlling RH at 60±2%, the measured water content was clearly higher than and different from values calculated using the water ascending model (Lee and Hsu, 1998). It may be that the water absorptive properties of soluble organic carbons in aerosols are not taken into consideration in this model.
    關聯: 計畫編號：CNEV9224
    显示于类别:[環境工程與科學系(所)] 校內計畫

    文件中的档案:

    档案 描述 大小格式浏览次数
    92CNEV9224.pdf205KbAdobe PDF1018检视/开启


    在CNU IR中所有的数据项都受到原著作权保护.

    TAIR相关文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈