Miniaturization of this technique allows significant cost savings. 

Detection of halogenated organic compounds in gas chromatography by concurrent monitoring of the emission from chlorine (a) and bromine (b). 1) 1,1-dichloroethylene, 2) methylene chloride, 3) trans-1,2-dichloroethylene, 4) cis-1,2-dichloroethylene, 5) bromodichloromethane, 6) dibromochloromethane.