Fourier Transform Infrared Spectroscopy

Fourier Transform Infrared Spectroscopy (FTIR) is a technique that uses the infrared spectrum of absorption of a gas sample to detect multiple compounds. Our FTIR spectrometer can be used to detect a wide variety of compounds simultaneously, at the job site, without the need for lengthy lab analyses. FTIR is particularly useful in diagnosing problems with selective catalytic reduction (SCR) systems by providing real time ammonia monitoring, and can also be used for ambient air monitoring and fence line monitoring of fugitive emissions.

Y-axis = concentration in ppm

The EPA has developed a list of Reference Spectra for many hazardous air pollutants for use in EPA Test Method 320, Measurement of Vapor Phase Organic and Inorganic Emissions by FTIR Spectroscopy. Using reference spectra, we can use our FTIR spectrometer to measure a wide variety of compounds. When using the FTIR to perform a district approved source test, more rigorous QA/QC is required, necessitating the use of calibration gas for each tested analyte. Compounds for which we have calibration gases currently in stock are listed below in bold.

Our FTIR spectrometer can be used to measure the compounds listed below. This is not a complete list. If you need testing for a compound not listed here or on the Test Methods page, please contact us.

• 1-Butanol (n-Butanol) (C4H10O)
• 1,1-Dimethyl hydrazine (C2H8N2)
• 1,1-Dichloroethane (1,1-DCA) (C2H4Cl2)
• 1,1-Dichloroethene (1,1-DCE) (1,1-Dichloroethylene) (C2H2Cl2)
• 1,1,1-Trichloroethane (TCA) (Methyl chloroform) (C2H3Cl3)
• 1,1,2-Trichloroethane (C2H3Cl3)
• 1,1,2-Trichlorotrifluoroethane (1,1,2-Trichloro-1,2,2-trifluoroethane) (C2Cl3F3)
• 1,1,2,2-Tetrachloroethane (C2H2Cl4)
• 1,2-Dibromo-3-chloropropane (DBCP) (C3H5Br2Cl)
• 1,2-Dibromoethane (Ethylene dibromide) (C2H4Br2)
• 1,2-Dichloro-1,1,2,2-tetrafluoroethane (CFC 114) (1,2-Dichlorotetrafluoroethane) (C2Cl2F4)
• 1,2-Dichlorobenzene (orthodichlorobenzene) (C6H4Cl2)
• 1,2-Dichloroethane (Ethylene dichloride (EDC)) (C2H4Cl2)
• 1,2-Dichloropropane (Propylene dichloride) (C3H6Cl2)
• 1,2-Epoxybutane (C4H8O)
• 1,2-Propylenimine (2-Methyl aziridine) (C3H7N)
• 1,2,3-Trimethylbenzene (C9H12)
• 1,2,4-Trichlorobenzene (C6H3Cl3)
• 1,2,4-Trimethylbenzene (C9H12)
• 1,3-Butadiene (C4H6)
• 1,3-Dichlorobenzene (C6H4Cl2)
• 1,3-Dichloropropene (CHCl-CH-CHCl)
• 1,3,5-trimethylbenzene (Mesitylene) (C9H12)
• 1,4-Dichlorobenzene (p-Dichlorobenzene) (C6H4Cl2)
• 1,4-Difluorobenzene (C6H4F2)
• 1,4-Dioxane (1,4-Diethyleneoxide) (C4H8O2)
• 2-Butanone (MEK) (Methyl ethyl ketone) (C4H8O)
• 2-Chloroacetophenone (Cl-C5H4-CO-CH3)
• 2-Ethyltoluene (C9H12)
• 2-Hexanone (Methyl n-Butyl Ketone) (C6H12O)
• 2-Methyl-2-propanol (C4H10O)
• 2-Nitropropane (C3H7NO2)
• 2-Propanol (Isopropanol) (C3H8O)
• 2,2,4-Trimethylpentane (C8H18)
• 2,4-Toluene diisocyanate (C9H6N2O2)
• 2,4,5-Trichlorophenol (C8H2Cl3OH)
• 2,4,6-Trichlorophenol (C6H3Cl3O)
• 3-Chloro-1-propene (C3H5Cl)
• 3-Ethyltoluene (C9H12)
• 4-Bromofluorobenzene (C6H4BrF)
• 4-Ethyltoluene (C9H12)
• 4-Isopropyltoluene (C10H14)
• 4-Methyl-2-pentanone (Methyl isobutyl ketone) (Hexone) (C6H12O)
• Acetaldehyde (C2H4O)
• Acetone (2-Propanone) (C3H6O)
• Acetonitrile (C2H3N)
• Acetophenone (C8H8O)
• Acrolein (2-Propenal) (C3H4O)
• Acrylic acid (C3H4O2)
• Acrylonitrile (2-Propenenitrile) (C3H3N)
• Allyl Chloride (C3H5Cl)
• alpha-Methylstyrene (C9H10)
• alpha-Pinene (C10H16)
• Ammonia (NH3)
• Aniline (Phenylamine) (C6H7N)
• Benzene (C6H6)
• Benzotrichloride (C8H6-CCl3)
• Benzyl chloride (C7H7Cl)
• beta-Propiolactone (C3H4O2)
• Bis (chloromethyl) ether (C2H4Cl2O)
• Bromochloromethane (CH2BrCl)
• Bromodichloromethane (Dichlorobromomethane) (CHBrCl2)
• Bromoform (Tribromomethane) (CHBr3)
• Bromomethane (CH3Br)
• Carbon disulfide (CS2)
• Carbon dioxide (CO2)
• Carbon monoxide (CO)
• Carbon tetrachloride (CCI4)
• Carbonyl sulfide (COS)
• Chloroacetic acid (C2H3ClO2)
• Chlorobenzene (C6H5Cl)
• Chlorodifluoromethane (CHClF2)
• Chloroethane (Ethyl chloride) (C2H5Cl)
• Chloroform (Trichloromethane) (CHCl3)
• Chloromethane (CH3Cl)
• Chloromethyl methyl ether (ClCH2-O-CH3)
• Chloroprene (2-Chloro-1,3-butadiene) (C4H5Cl)
• cis-1,2-Dichloroethene (C2H2Cl2)
• cis-1,3-Dichloropropene (C3H4Cl2)
• Cyclohexane (C6H12)
• d-Limonene (C10H16)
• Dibromochloromethane (CHBr2Cl)
• Dichlorodifluoromethane (CFC 12) (CCl2F2)
• Dichloroethyl ether (bis(2-chloroethyl) ether) (C4H8Cl2O)
• Dichloromethane (Methylene chloride) (CH2Cl2)
• Dichlorvos ((CH3O)2-P(O)-CH-C)
• Diisopropyl Ether (Isopropyl Ether) (C6H14O)
• Dimethyl carbamyl chloride ((CH3)2-NCOCl)
• Dimethyl formamide (C3H7NO)
• Dimethyl phthalate (C10H10O4)
• Dimethyl disulfide (C2H6S2)
• Dimethyl sulfide (C2H6S)
• Epichlorohydrin (1-Chloro-2,3-epoxypropane) (C3H5ClO)
• Ethanol (Ethyl Alcohol) (C2H6O)
• Ethyl acetate (C4H8O2)
• Ethyl acrylate (C5H8O2)
• Ethyl tert-Butyl Ether (tert-Butyl Ethyl Ether) (C6H14O)
• Ethylbenzene (C8H10)
• Ethylene oxide (C2H4O)
• Ethylidene dichloride (1,1-Dichloroethane) (C2H4Cl2)
• Formaldehyde (CH2O)
• Hexachlorobutadiene (C4Cl6)
• Hexachlorocyclopentadiene (C5Cl6)
• Hexachloroethane (C2Cl6)
• Hexamethylphosphoramide (I(CH3)2NI3P(O))
• Hexane (C6H14)
• Hydrazine (H4N2)
• Hydrochloric acid (HCL)
• Hydrogen sulfide (H2S)
• Isophorone (C9H14O)
• Isopropyl Acetate (C5H10O2)
• Isopropylbenzene (Cumene) (C9H12)
• Maleic anhydride (C4H2O3)
• m-Cresol (C7H8O)
• Methane (CH4)
• Methanol (CH4O)
• Methanethiol (Methyl Mercaptan) (CH4S)
• Methyl bromide (Bromomethane) (CH3Br)
• Methyl chloride (Chloromethane) (CH3Cl)
• Methyl hydrazine (CH6N2)
• Methyl iodide (Iodomethane) (CH3I)
• Methyl methacrylate (C5H8O2)
• Methyl tert-Butyl Ether (MTBE) (C5H12O)
• m-Xylenes (C8H10)
• n-Butyl Acetate (C6H12O2)
• n-Decane (C10H22)
• n-Heptane (C7H16)
• n-Nonane (C9H20)
• n-Octane (C8H18)
• n-Propylbenzene (C9H12)
• n-Undecane (C11H24)
• Naphthalene (C10H8)
• Nitric oxide (NO)
• Nitrobenzene (C6H5NO2)
• Nitrogen dioxide (NO2)
• Nitrogen oxides (NOx)
• Nitrous oxide (N2O)
• N-Nitrosodimethylamine ((CH3)2NNO)
• N-Nitrosomorpholine (C4H8N2O2)
• N,N-Diethyl aniline (N,N-Dimethylaniline) (C8H11N)
• o-Cresol (C7H8O)
• o-Toluidine (C7H9N)
• o-Xylenes (C8H10)
• Oxolane (Tetrahydrofuran (THF)) (C4H8O)
• p-Cresol (C7H8O)
• Phenol (C6H6O)
• Propene (Propylene) (C3H6)
• Propionaldehyde (C3H6O)
• Propylene oxide (C3H7O)
• p-Xylenes (C8H10)
• Qinoline (C9H7N)
• sec-Butylbenzene (C10H14)
• Styrene (Vinylbenzene) (C8H8)
• Styrene oxide (C8H6CHCH2O)
• Sulfur monoxide (SO)
• Sulfur dioxide (SO2)
• Sulfur trioxide (SO3)
• Sulfuric acid mist (S2SO4)
• tert-Amyl Methyl Ether (2-Methoxy-2-methylbutane) (C6H14O)
• Tetrachloroethene (PCE) (Tetrachloroethylene) (C2Cl4)
• Toluene (Methylbenzene) (C7H8)
• trans-1,2-Dichloroethene (C2H2Cl2)
• trans-1,3-Dichloropropene (C3H4Cl2)
• Trichloroethene (TCE) (Trichloroethylene) (C2HCl3)
• Trichlorofluoromethane (CFC 11) (Trichlorofluoromethane) (CCl3F)
• Triethylamine (C6H15N)
• Vinyl acetate (C4H6O2)
• Vinyl bromide (C2H3Br)
• Vinyl chloride (Chloroethene) (C2H3Cl)
• Vinylidene chloride (1,1-Dichloroethylene) (C2H2Cl2)
• Water vapor (H2O)