A Re-Examination of Ambient Air Ozone Monitor Interferences
A Re-Examination of Ambient Air Ozone Monitor Interferences
复制标题
DOI：
10.3155/1047-3289.60.11.1353
复制
发表时间：
2010-11-01
影响因子：
2.7
通讯作者：
Ollison, Will M.
中科院分区：
文献类型：
--
作者：
Spicer, Chester W.;Joseph, Darrell W.;Ollison, Will M.
达到国家环境空气质量标准（NAAQS）的臭氧（O（3））可能会在全国范围内花费数十亿美元。通过联邦参考方法（FRM）、乙烯化学发光或联邦等效方法（FEM）（主要是紫外线（UV）吸收）进行的O（3）测量，判断是否达到NAAQS。从20世纪80年代开始，FRM监测器被FEM取代，因此今天美国几乎所有的监测都使用UV方法。本报告总结了一个实验室和配置的环境空气监测研究的干扰O（3）监测器。在实验室中检查的潜在干扰包括水蒸气，汞，邻硝基苯酚，萘，对甲苯甲醛，和烟雾室模拟城市大气光化学的混合反应产物。在2007年夏季O（3）季节，在德克萨斯州休斯顿的六个地点，为湿度平衡而修改的UV吸收O（3）监测器也与UV FEM O（3）监测器搭配使用。结果表明，湿度和干扰物种可以积极偏置（高估）O（3）测量FEM监测器用于确定符合O（3）标准。结果还表明，湿度平衡可以减轻这种偏差。
Attaining the National Ambient Air Quality Standard (NAAQS) for ozone (O(3)) could cost billions of dollars nationwide. Attainment of the NAAQS is judged on O(3) measurements made by the Federal Reference Method (FRM), ethylene chemiluminescence, or a Federal Equivalent Method (FEM), predominantly ultraviolet (UV) absorption. Starting in the 1980s, FRM monitors were replaced by FEMs so that today virtually all monitoring in the United States uses the UV methodology. This report summarizes a laboratory and collocated ambient air monitoring study of interferences in O(3) monitors. Potential interferences examined in the laboratory included water vapor, mercury, o-nitrophenol, naphthalene, p-tolualdehyde, and mixed reaction products from smog chamber simulations of urban atmospheric photochemistry. UV absorption O(3) monitors modified for humidity equilibration were also collocated with UV FEM O(3) monitors at six sites in Houston, TX, during the 2007 summer O(3) season. The results suggest that humidity and interfering species can positively bias (overestimate) O(3) measured by FEM monitors used to determine compliance with the O(3) standards. The results also suggest that humidity equilibration can mitigate this bias.