Sadanaga Yasuhiro, Yuba Akie, Kawakami Jun-Ichi, Takenaka Norimichi, Yamamoto Masatoshi, Bandow Hiroshi
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka, Sakai, Osaka 599-8531, Japan.
Anal Sci. 2008 Aug;24(8):967-71. doi: 10.2116/analsci.24.967.
An in situ nitric acid analyzer has been designed for sensing in the remote atmosphere. Its operation is based on measuring the concentration difference between the total odd nitrogen species (NO(y)) and HNO(3)-scrubbed NO(y). NO(y) was measured by an NO-ozone chemiluminescent detector equipped with a molybdenum converter. A temperature-controlled annular denuder coated with NaCl was used as a scrubber of gaseous HNO(3). The current detection limit of the HNO(3) analyzer was estimated to be 158 and 71 pptv (parts per trillion by volume) with an integration time of 2 and 10 min (2sigma), respectively. The analyzer was calibrated using standard gaseous HNO(3) to verify its performance. The HNO(3) concentrations measured by the scrubber difference and the NO-ozone chemiluminescence methods (SDCL method) were in agreement with those obtained by the denuder method within the experimental uncertainties (more than +/-4%). We conducted limited field observations of NO(y) and HNO(3) in the remote atmosphere using the newly designed SDCL method at Cape Hedo, Okinawa, Japan.
已设计出一种用于远程大气传感的原位硝酸分析仪。其工作原理是测量总奇氮物种（NO(y)）与经HNO₃洗涤后的NO(y)之间的浓度差。通过配备钼转换器的NO - 臭氧化学发光探测器测量NO(y)。使用涂有NaCl的温度控制环形剥蚀器作为气态HNO₃的洗涤器。HNO₃分析仪当前的检测限估计在积分时间分别为2分钟和10分钟（2σ）时为158和71 pptv（体积万亿分之一）。使用标准气态HNO₃对分析仪进行校准以验证其性能。通过洗涤器差值法和NO - 臭氧化学发光法（SDCL法）测量的HNO₃浓度与在实验不确定度范围内（超过±4%）通过剥蚀器法获得的浓度一致。我们在日本冲绳县比谢岬使用新设计的SDCL法对远程大气中的NO(y)和HNO₃进行了有限的实地观测。
