Williams E J, Fehsenfeld F C, Jobson B T, Kuster W C, Goldan P D, Stutz J, McClenny W A
Chemical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, Colorado 80305, USA.
Environ Sci Technol. 2006 Sep 15;40(18):5755-62. doi: 10.1021/es0523542.
This paper evaluates the accuracy of ozone measurements made by monitors that determine ozone concentrations in ambient air by UV absorption. These monitors are typically used to measure ozone for the purpose of establishing local compliance to air-quality standards. The study was predicated by the concern that commercially available UV absorbance O3 monitors may be subject to interference from volatile organic carbon (VOC) species that absorb light at 254 nm. To test for these and other effects, we compared simultaneous O3 measurements made by a commercial UV O3 monitor with an O3-NO chemiluminescence instrument, which is not subject to interference by VOC compounds. The comparisons were carried out in the summers of 1999 and 2000 at urban/industrial sites in Nashville and Houston, and in 2004 aboard a ship in the Gulf of Maine. In the two urban areas, we also compared the 03 measurements from these two methods with O3 measurements made by a long-path differential optical absorption spectrometer (DOAS). Our tests indicate that, with well-maintained monitors, there are no significant interferences even in areas with significant ambient concentrations of potentially interfering VOCs.
本文评估了通过紫外线吸收测定环境空气中臭氧浓度的监测器所进行的臭氧测量的准确性。这些监测器通常用于测量臭氧，以确定当地是否符合空气质量标准。该研究的起因是担心市售的紫外线吸收式臭氧监测器可能会受到在254纳米波长吸收光的挥发性有机化合物（VOC）的干扰。为了测试这些及其他影响，我们将一台商用紫外线臭氧监测器与一台臭氧-一氧化氮化学发光仪器同时进行的臭氧测量结果进行了比较，后者不受挥发性有机化合物的干扰。比较工作于1999年和2000年夏季在纳什维尔和休斯顿的城市/工业地点进行，并于2004年在缅因湾的一艘船上进行。在这两个城市地区，我们还将这两种方法测得的臭氧测量结果与用长路径差分光学吸收光谱仪（DOAS）测得的臭氧测量结果进行了比较。我们的测试表明，对于维护良好的监测器，即使在存在大量潜在干扰性挥发性有机化合物的环境浓度区域，也不存在显著干扰。
