Mobile Lab. Introduction in EAL
1. Key functions of the Mobile Lab.
（1） On-road measurement of the vehicle emission
（2） Real-time monitoring of the industrial area in pollution incident
case
（3） Short-term monitoring for the environmental sensitive site
2. Allocated Instruments in the Mobile Lab.
（1） Gaseous pollutants
NO Species
Monitoring principle
Working range
SO2 is electronically excited with the
radiation of an UV lamp, yielding an
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SO2
excited species that fluoresces at 350 nm
wavelength. Concentration of SO2 is
0-50 ppb or
0-20,000 ppb
calculated based on the emission of
fluorescence.
As NO reacts with O3
electronically-excited NO2* molecules
will be generated. The light emission
intensity is linearly proportional to the
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NOX
concentration of NO. Concentration of
0-50 ppb or
NOX mixture can be measured if NO2 is
0-20,000 ppb
converted to NO before its reaction with
O3. The difference between NOx and
NO results will be the concentration of
NO2.
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CO
Carbon
Monoxide
(CO)
has
a
characteristic infrared absorption. The
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0-1 ppm or
0-1,000 ppm
absorption of infrared radiation by CO
molecules can be used to measure CO
concentrations using the non-dispersive
infrared (NDIR) detector system.
Carbon
Dioxide
(CO2)
has
a
characteristic infrared absorption. The
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CO2
absorption of infrared radiation by CO2
0-2 ppm or
molecules can be used to measure CO2
0-2000 ppm
concentrations using the non-dispersive
infrared (NDIR) detector system.
Ozone’s has a characteristic absorption
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O3
of UV at 254nm which can be used to
0-100 ppb or
measure the concentration of Ozone(O3)
0-10 ppm
in the sample gas.
Flame Ionization Detector (FID) with
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TNMH
catalytic subtraction is used to measure
the concentration of total non-methane
＜20 ppm
hydrocarbons.
As
NO
reacts
with
O3
electronically-excited NO2* molecules
will be generated. The light emission
intensity is linearly proportional to the
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NH3
concentration of NO. Concentration of
0-50 or
NOX mixture can be measured if NH3 is
0-2,000 ppb
converted to NO before its reaction with
O3. The difference between NOx and
NO results will be the concentration of
NH3.
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（2） Aerosol carbons
NO
Species
Monitoring principle
Working range
The Organic carbon in the collected
samples is oxidized to CO2 with
manganese dioxide under anaerobic
state detect with
Flame Ionization
Detector
to
(FID)
obtain
the
concentration of organic carbon（OC）.
1
EC/OC
On the other hand, the elemental
－
carbon will be converted to CO2 under
the
atmosphere
of
2%
O2
in
manganese dioxide oxidizing oven and
detect with measured by the Flame
Ionization Detector (FID) to obtain the
concentration of elemental carbon
（EC）.
（3） Particle pollutants
NO
Species
Monitoring principle
Working range
Comparing the β-ray attenuation of
the filter before and after PM10(or
1
PM10/PM2.5 PM2.5) sampling .calculate PM10(or
PM2.5) concentration base on the
reading of β-ray attenuation
（4） Auxiliary Meteorological instruments
1、Weather vane and anemometer
2、Hygrothermograph
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0 ~ 1 x 104
μg / m3
（5）GPS and on-line data collection system
1、Data collection system
2、Global Positioning System, GPS
3、Monitoring system and video recorder
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鋼瓶室
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