![Page 1: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/1.jpg)
Aerosol Chemical Speciation Monitor (ACSM) Advances
![Page 2: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/2.jpg)
Aerosol Chemical Speciation Monitor (ACSM)
Thermal Vaporization &
Electron Impact
Ionization
Aerodynamic lens
Particle Beam
Generation
Particle
Composition
Data AcquisitionComputer
TOF
or
Q-M
S
Turbo Pumps
Aerosol
SamplingIn from cyclone
Out to sampling pump
Filter
3-way Valve
Ng, et al., Aerosol Sci. Technol., 45:7, 770-784, 2011
No Sizing
9/8/2018 AMS Users Meeting 2016 2
![Page 3: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/3.jpg)
Quadrupole, Q-ACSM Time-of-Flight, ToF-ACSM
9/8/2018 AMS Users Meeting 2016 3
![Page 4: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/4.jpg)
Von der Weiden et al., Atmos. Meas. Tech., 2, 479-494, 2009.
Improved aerosol sampling system for efficient delivery of PM2.5 to aerodynamic lens
Intermediate Pressure Lens (IPL) delivers PM2.5 to detector
PM2.5 Capable ACSM – Laboratory CharacterizationXu et al., AS&T, 2016
9/8/2018 AMS Users Meeting 2016 4
Capture Vaporizer effectively vaporizes all large particles for complete detection of NR-PM2.5
![Page 5: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/5.jpg)
PM2.5 Capable ACSM – Ambient CharacterizationZhang et al., ACPD, 2017
9/8/2018 AMS Users Meeting 2016 5
![Page 6: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/6.jpg)
PM2.5 Capable ACSM – Ambient CharacterizationZhang et al., ACPD, 2017
9/8/2018 AMS Users Meeting 2016 6
![Page 7: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/7.jpg)
Towards simplified calibration of ACSM - electrospray
Inlet (e.g., CPC)
Vacuum Pump
10 mCiPolonium Dryer/denuder
Needle Valve
AMS inletSyringe pump
Capillary
Grounded platewith orifice
sheath gas
Micro-positioner
static neutralizer
Capillary Grounded plate
Plastic cover
3025201510
50
AM
S O
rg d
M/d
log
10d
va (
µg
m-3
)3 4 5 6 7 8 9
1002 3 4 5 6 7 8 9
PToF Dva (nm)
30x109
2520151050
SM
PS
dV
/dlo
g10 d
M
3 4 5 6 7 8 9100
2 3 4 5 6 7 8 91000
SMPS Dm (nm)
15
10
5
0
15
10
5
0
20x109
15
10
5
0
15x109
10
5
0
1st Run
2nd Run
3rd Run
Dva = Dm * 0.91
Want repeatable (narrow) distribution to eliminate particle sizingWorked for oleic acid in acetonitrile but not for aqueous or saltsPractical concerns as well (e.g. radioactive source)
9/8/2018 AMS Users Meeting 2016 7
![Page 8: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/8.jpg)
Towards new calibrations techniques – gas introduction
9/8/2018 AMS Users Meeting 2016 8
m/z
44
dif
f
CO2 Input / ppm
Slope = 1.37e-13
1e6*0.78*1.37e-13 amps/ppm = 1.06e-7 amps
Our airbeam signal is 1e-7 amps
Gases are easier to use for calibration than aerosols (by far).We get a nice calibration curve at varying CO2 concentrations.But what does this add?
![Page 9: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/9.jpg)
Towards simplified calibration – Ultrasonic nebulizer and OPC
9/8/2018 AMS Users Meeting 2016 9
Generate particles with UN that are large enough to be counted by the OPCFeed ACSM and OPC the polydisperse and integrate the size distribution to calculate the input mass
![Page 10: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/10.jpg)
Towards simplified calibration – Ultrasonic nebulizer and OPC
9/8/2018 AMS Users Meeting 2016 10
![Page 11: Aerosol Chemical Speciation Monitor (ACSM) Advancescires1.colorado.edu/...ACSMAdvancesSTL2018.pdf · Aerosol Chemical Speciation Monitor (ACSM) Thermal Vaporization & Electron Impact](https://reader030.vdocuments.us/reader030/viewer/2022040923/5e9e1d6b8514b102ae7ff1a5/html5/thumbnails/11.jpg)
Towards simplified calibration – Ultrasonic nebulizer and OPC
9/8/2018 AMS Users Meeting 2016 11
UN/OPC Calibration Standard ACSM Calibration