In the present work,a novel analytical method was proposed for the determination of toluene diisocyanate(TDI)in synthetic-rubber track by ion chromatography(IC)coupled with an ultraviolet detector setting at 212 nm.TDI can be hydrolyzed to toluene diamine(TDA)which can be separated by cation-exchange 1C easily.The optimum IC separation was performed on an IonPac CS 12A colunm(150 mm×4.0 nun)using 20 mmol L-1 sodium sulfate,10 mmol L-1 sulfuric acid and 10% acetonitrile as eluent.It was found that a higher signal response of TDA could be obtained under alkaline condition.A suppressor was used to change the acidic eluent into alkaline one.0.8 mol L-1 potassium hydroxide was chosen as the optimum regeneration eluent.With the added suppressor and regenerant,signal response was magnified by about 16 times and lower limit of detection(LOD,0.13 μg L-1)was obtained,Within-day relative standard deviation(R.S.D.)was less than 3.6%.The recoveries of TDI spiked in synthetic-rubber track samples were 96.4-110.6%.