Short name:
I- CIMS

Full name:
Iodide Chemical Ionization Mass Spectrometer

What is being measured:
Vapor phase oxidized and halogenated VOCs

Sampling Protocol:
Online

Manufacturer:
Aerodyne

Model:
1

Instrument year :
2013

Data recording software:
TOFDAQ

Data analysis software:
Igor Pro v6

Raw data time resolution:
1 second

Analysis data averaging:
NA

Detection limit:
Species-dependent

Sensitivity to temperature (and correction method, if applicable): :
Wall "memory" effects are minimized at higher temperatures i.e. there is a faster response time at higher sampled temperatures. No specific correction method is employed for the instrument readings, but the ion molecule reaction region (IMR) is maintained at 40C to minimize wall effects.

Sensitivity to relative humidity (and correction method, if applicable): :
Instrument sensitivity to RH has been reported. We pass the reagent carrier gas (UHP N2) through deionized water before it passes to the IMR region so that it is humidified to a constant RH for all the sample flow.

Sampling method:
Direct sampling

Sample preparation method:
None

Sample residence time (chamber to instrument) (seconds):

Length of tubing (cm):

Instrument flow rate:
2 lpm

Tubing inner diameter:
1/4 inch

Tubing material:
PFA Teflon

Chemical identification method:
Iodide ions come into contact with compounds in sample stream in the ion molecule reaction region (IMR) of the CIMS. The I- + compound adducts pass through the time of flight (ToF) chamber, where m/z is proportional to ToF. Three calibrants are used for the mass-time of flight conversion: I-, IH2O-, I3-.

Data analysis method:

Quantification method:

Calibration method:
Gas calibration system is currently being tested.

Calibration drift estimate:
No estimate

Calibration schedule:
As Needed

Uncertainty estimation method:
NA

Known interferences:

Link to supplemental information:

Additional notes:

Measurement uncertainty:

Measurement units: