Short name:
CF3O- CIMS: negative mode, calibrated

Full name:
chemical ionization mass spectrometer w/ CF3O- reagent ion

What is being measured:
oxidized VOCs (especially alcohols, hydroperoxides, acids, nitrates)

Sampling Protocol:
Online

Manufacturer:
Varian

Model:
1200

Instrument year :
None specified

Data recording software:
Varian workstation

Data analysis software:
Matlab

Raw data time resolution:
0.125 s

Analysis data averaging:
0.5 s averages of raw data

Detection limit:
100 ppt

Sensitivity to temperature (and correction method, if applicable): :
minor

Sensitivity to relative humidity (and correction method, if applicable): :
ions are independently calibrated for RH

Sampling method:
Direct sampling

Sample preparation method:

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

Length of tubing (cm):
100

Instrument flow rate:
2 lpm

Tubing inner diameter:
0.16 in

Tubing material:
FEP Teflon

Chemical identification method:
ion fragmentation in triple quadrupole

Data analysis method:

Quantification method:
Baseline correction, dilution correction, humidity-dependent calibration factor

Calibration method:
Compound-dependent: permeation tube, commercial or synthetic standards

Calibration drift estimate:
Low (on the order of weeks)

Calibration schedule:
As Needed

Uncertainty estimation method:
Uncertainties are estimated from propagating uncertainties in the steps of the absolute calibrations

Known interferences:

Link to supplemental information:
St. Clair et al. (DOI 10.1063/1.3480552)

Additional notes:

Measurement uncertainty:
+/- 30% unless otherwise noted

Measurement units:
ppbv unless otherwise noted