Electrochemical ozone sensors: A miniaturised alternative for ozone measurements in laboratory experiments and air-quality monitoring
Electrochemical ozone sensors: A miniaturised alternative for ozone measurements in laboratory experiments and air-quality monitoring
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DOI：
10.1016/j.snb.2016.09.020
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发表时间：
2017-03-01
影响因子：
8.4
通讯作者：
Batchellier, Tanya
中科院分区：
文献类型：
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作者：
Pang, Xiaobing;Shaw, Marvin D.;Batchellier, Tanya
臭氧（O-3）测量是空气质量管理和许多大气化学实验室实验的关键组成部分。基于UV吸收的常规臭氧监测装置相对笨重且昂贵，并且具有相对高的功耗，这限制了它们在固定场所的使用。在这项研究中，电化学O-3传感器（OXB 421，Alphasense）被用于与LabJack和Labview数据采集（DAQ）相结合的嵌入式O-3测量设备中。该设备需要5V直流（VDC）电源，总功耗约为5 W。总重量小于0.5公斤，足够低，便于现场部署。电化学O-3传感器在5 ppb-10 ppm范围内产生与O-3浓度成正比的电压信号。两种氧传感器的性能之间有很好的一致性，具有良好的线性系数（R-2 = 0.9995）。分别研究了相对湿度和气体样品流量对传感器标定和灵敏度的影响。重合校准曲线表明，传感器性能几乎相同，即使在不同的RH和流量后，重新调零过程，以抵消传感器基线漂移。快速RH变化（类似于20%/min）会在传感器信号中产生显著和即时的变化，并且在这种快速RH变化后，传感器始终需要长达40分钟才能恢复其原始值。相反，缓慢的RH变化（类似于0.1%/min）对传感器响应的影响很小。为了测试臭氧传感器在实际应用中的性能，臭氧传感器被用于（i）实验室实验，以测量海水吸收造成的臭氧损失，以及（ii）18天内的空气质量监测。结果发现，海水臭氧吸收的亚油酸的体积在海面微层和计算的吸收系数的基础上的传感器测量是接近以前的研究。在18天的空气质量监测中，O-3传感器的校正数据与参考UV O-3分析仪获得的数据吻合良好，r（2）= 0.83（n= 8502）。本研究的新奇在于，电化学O-3传感器在实验室和环境空气质量监测中的O-3测量进行了全面的研究，由于其低成本，低功耗，便携式和简单的传导特性，它可以成为传统O-3监测设备的替代品。(C)2016作者由爱思唯尔公司出版
Ozone (O-3) measurements are a critical component of air quality management and many atmospheric chemistry laboratory experiments. Conventional ozone monitoring devices based on UV absorption are relatively cumbersome and expensive, and have a relative high power consumption that limits their use to fixed sites. In this study electrochemical O-3 sensors (OXB421, Alphasense) were used in a miniaturised O-3 measurement device combined with LabJack and Labview data acquisition (DAQ). The device required a power supply of 5 V direct current (VDC) with a total power consumption of approximately 5 W. Total weight was less than 0.5 kg, low enough for portable in situ field deployment. The electrochemical O-3 sensors produced a voltage signal positively proportional to O-3 concentrations over the range of 5 ppb-10 ppm. There was excellent agreement between the performances of two O-3 sensors with a good linear coefficient (R-2 = 0.9995). The influences of relative humidity (RH) and gas sample flow rate on sensor calibrations and sensitivities have been investigated separately. Coincident calibration curves indicate that sensor performances were almost identical even at different RHs and flow rates after a re-zeroing process to offset the sensor baseline drifts. Rapid RH changes (similar to 20%/min) generate significant and instant changes in sensor signal, and the sensors consistently take up to 40 min to recover their original values after such a rapid RH change. In contrast, slow RH changes (similar to 0.1%/min) had little effect on sensor response. To test the performance of the miniaturised O-3 device for real-world applications, the O-3 sensors were employed for (i) laboratory experiments to measure O-3 loss by seawater uptake and (ii) air quality monitoring over an 18-day period. It was found that ozone uptake by seawater was linear to the volume of linoleic acid on a sea surface microlayer and the calculated uptake coefficients based on sensor measurements were close to those from previous studies. For the 18-day period of air quality monitoring the corrected data from the O-3 sensor was in a good agreement with those obtained by reference UV O-3 analyser with an r(2) of 0.83 (n= 8502). The novelty of this study is that the electrochemical O-3 sensor was comprehensively investigated in O-3 measurements in both laboratory and ambient air quality monitoring and it can to be a miniaturised alternative for conventional O-3 monitoring devices due to its low cost, low power-consumption, portable and simple-conduction properties. (C) 2016 The Authors. Published by Elsevier B.V.