NOAA Iodide Ion Time-of-Flight Chemical Ionization Mass Spectrometer (NOAA ToF CIMS)
Iodide Ion ToF (Time-of-Flight) CIMS (Chemical Ionization Mass Spectrometer)
Principle of the Measurement
Chemical ionization mass spectrometric detection of gas phase organic and inorganic analytes via I- adduct formation
Species Measured
Reactive nitrogen species: HNO3 (nitric acid), HONO (nitrous acid), HO2NO2 (peroxynitric acid), N2O5 (dinitrogen pentoxide), HNCO (isocyanic acid)
Halogen Species: ClNO2, HCl, HBr, HOBr, HOCl, Cl2, Br2
Low to intermediate volatility organic species
Time Response
Instrumental response <1 sec, Field response is limited by inlet surface affinity for a particular species
Detection Limit
Precision on 1s data various by species
Accuracy
(15% + 1 pptv) for N2O5
(20% + 1 pptv) for ClNO2
(30% + 15 pptv) for HONO
(25% + 10 pptv) for HO2NO2
(15% + 15 pptv) for HNO3
(20% + 5 pptv) for HNCO
(20% + 15 pptv) for HCOOH
(30% + 1 pptv) for halogenated species
Manufacturer
TOFWERK/Aerodyne Research Inc. (modified)