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High Time-Resolution Optical Sensor for Monitoring Atmospheric Nitrogen Dioxide
journal contribution
posted on 2017-11-14, 00:00 authored by Yong Tian, Xiaomin Zhang, Huiyan Shen, Aifeng Liu, Zongshan Zhao, Ming-Li Chen, Xu-Wei ChenHigh
time-resolution monitoring of nitrogen dioxide (NO2) is
of great importance for studying the formation mechanism of
aerosols and improving air quality. Based on the Griess–Saltzman
(GS) reaction, a portable NO2 optical sensor was developed
by employing a porous polypropylene membrane tube (PPMT) integrated
gas permeation collector and detector. The PPMT was filled with GS
reagents and covered with a coaxial jacket tube for gas collection.
Its two ends were respectively fixed with a yellowish-green light-emitting
diode and a photodiode for optic signal reception. NO2 was
automatically introduced through the collector by two air pumps cooperating
with a homemade gas injector. Under the optimized conditions, the
device presented good performance for monitoring NO2, such
as a limit of detection of 5.1 ppbv (parts per billion by volume),
an intraday precision of 4.1% (RSD, relative standard deviation, n = 11, c = 100 ppbv), an interday precision
of 5.7% (RSD, n = 2–3 per day for 5 days, c = 100 ppbv), an analysis time of 4.0 min, and a linearity
range extended to 700 ppbv. The developed device was successfully
applied to analyzing outdoor air with a comparable precision to that
of the standard method of China. The high time-resolution characteristic
that includes sampling 15 times per hour and a good stability for
10 days of urban air analysis had also been evaluated.
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gas injectorjacket tubePPMT5.1 ppbvgas collectionpolypropylene membrane tubesignal receptionair pumpsyellowish-green light-emitting diodeair analysisHigh Time-Resolution Optical Sensornitrogen dioxidegas permeation collectoroptimized conditions4.0 mindevicesampling 15 timesMonitoring Atmospheric Nitrogen Dioxide High time-resolution monitoring5 dayslinearity rangeanalysis time10 days700 ppbvGS reagentsformation mechanisminterday precisionair qualityRSD
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