Instrument - Soot Particle High Resolution Time of Flight Aerosol Mass Spectrometer
Short name:
"Lab" AMS
Full name:
Soot Particle High Resolution Time of Flight Aerosol Mass Spectrometer
What is being measured:
Particles, particle mass spectra, particle aerodynamic size
Sampling Protocol:
Online
Manufacturer:
Aerodyne, Inc.
Model:
SP-AMS
Instrument year
:
None specified
Data recording software:
Data analysis software:
Igor Pro
Raw data time resolution:
1 s
Analysis data averaging:
20 s
Detection limit:
0.1 ug/m3
Sensitivity to temperature (and correction method, if applicable):
:
Sensitivity to relative humidity (and correction method, if applicable):
:
Sampling method:
Direct sampling
Sample preparation method:
Sample residence time (chamber to instrument) (seconds):
Length of tubing (cm):
30
Instrument flow rate:
0.1 LPM
Tubing inner diameter:
1/4 inch
Tubing material:
Stainless Steel
Chemical identification method:
Chemicals are identified by Electron Ionization mass spectra.
Organics is determined by summing up organic fragments. Inorganics (ammonium, sulfate, nitrate, etc.) are determined by their ions. These species are first vaporized via 600 C tungsten vaporizer.
Elemental carbon (soot particles) are vaporized using a 1064 nm intracavity YAG laser vaporizer.
Data analysis method:
Igor protocol by the Jimenez group (https://cires1.colorado.edu/jimenez-group/wiki/index.php/ToF-AMS_Analysis_Software)
Quantification method:
As reported, e.g., Zhang et al., 2005: https://pubs.acs.org/doi/abs/10.1021/es048568l
Calibration method:
Signal strength (ionization efficiency) calibration with 300 nm ammonium nitrate particles at varying diluted concentrations. Particle size (time of flight) calibration with 150-600 nm ammonium nitrate particles.
Calibration drift estimate:
No estimate
Calibration schedule:
As Needed
Uncertainty estimation method:
Will return to this later.
Known interferences:
Air beam (m/z 28, 44) and water signal (m/z 18)
Link to supplemental information:
Additional notes:
Measurement uncertainty:
5%
Measurement units:
ug/m3