| 大气中多环芳烃气/粒分配的不确定性分析 |
| 摘要点击 1857 全文点击 2137 投稿时间：2010-11-16 修订日期：2010-12-14 |
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| 中文关键词 多环芳烃 气/粒分配 滤膜吸附 穿透率 不确定性分析 误差传递 |
| 英文关键词 PAHs gas/particle partitioning filter absorption breakthrough rate uncertainty analysis propagation of error |
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| 中文摘要 |
| 于2010年8月10～14日用双层石英膜和双层聚氨酯泡沫（PUF）的方法采集并分析了厦门大学海洋楼顶大气中气态和颗粒态多环芳烃（PAHs），并采用标准误差传递方法对气/粒分配系数（Kp）的不确定度进行了分析.测量结果显示，低分子量PAHs如萘、 苊、 二氢苊和芴在PUF吸附体系中的穿透能力最强，穿透率接近50％；如考虑第一层石英滤膜对气态萘、 苊和二氢苊的吸附影响，则校正后的Kp值比校正前相应的Kp值低1个数量级以上.采用标准误差传递方法得到PAHs气/粒分配系数Kp的不确定度，介于28.14%～50.37%之间，且表现为易挥发和难挥发性PAHs的Kp值皆具有较高的不确定度，而半挥发性PAHs的Kp值的不确定度则较小.Kp值的不确定度来源分析显示，气态PAHs浓度的不确定度的影响最大（方差贡献均值=77.9％），其次为颗粒态PAHs浓度的不确定度（方差贡献均值=22.0％），大气颗粒物浓度的不确定度影响最小（方差贡献均值=0.1％）.因此，选择合适的采样系统以获取更加准确的气态PAHs的浓度，是提高PAHs气/粒分配系数准确度的关键. |
| 英文摘要 |
| During the period from August 10, 2010 through August 14, 2010, particle and gas phase PAHs were collected and analyzed using double filters plus PUFs (Poly Urethane Foam) sampling system, and the uncertainties of gas/particle partitioning coefficients of PAHs were investigated using the propagation of errors formulas. The results showed that low-molecular weight PAHs such as naphthalene, acenaphthylene, acenaphthene and fluorene possessed the strong breakthrough capacity with the breakthrough rates close to 50% in double PUF cartridges. The corrected Kp values based on the sorption of PAHs to the primary filter were more than an order of magnitude higher than those without sorption correction for naphthalene, acenaphthylene and acenaphthene. The uncertainties for all the 19 PAHs ranged from 28.14% to 50.37% based on the standard error propagation formulas, with higher values for volatile and involatile PAHs and lower values for semi-volatile PAHs. The results also showed that the uncertainties of Kp were mainly contributed from the measurements of particle (average variance contribution was 77.9%) and gas (average variance contribution was 22.0%) phase PAHs while the contributions of total suspended particle were ignorable. Thus, getting more accurate data for gaseous PAHs using an appropriate sampling system is the key to increase the accuracy of gas/particle partitioning coefficients of PAHs. |
