Study on the Determination of Toxic Chemicals in Exhaust Gas (V): Determination of Phenylenediamines by HPLC

A method was developed for the determination of o-, m- and p-phenylenediamines (PDs) in exhaust gas. PDs were collected by bubbling sample gas through 15ml of diluted hydrochloric acid. The sample solution was adjusted to 20ml with the absorbent solution and a 10 μl of it was injected to high performance liquid chromatograph with an UV detector. The recoveries were 95.9-104% after 240l of in-door air was passed through the solution to which the standards were added. The detection limits by this method were65-77μg/m3 for 60l of gas sample. PDs remained stable in the absorbent solution for at least 4 days. The method was successfully applied to exhaust gases from a dye industry.