A Dual-Channel Flame Photometric Detector with a Seperate Combustion Chamber

A new version of the dual-channel flame photometric detector is described for compounds containing phosphorus and sulphur. The sample is mixed with hydrogen before introduction into the detector. The burner is formed as a specific combustion chamber, which is separated from the emission chamber of the detector. Interference signals in the P-channel, caused by sulphur-containing compounds (crosstalk signals) are damped electrically. Thus the selectivity to hydrocarbons is increased by a factor of up to 10⁷, crosstalk signals are reduced by a factor of 10³ and flame stability is guaranteed (there are no flame-outs caused by amounts of up to 50 μl of liquid samples).