An analytical method was established for the determination of 118 volatile organic compounds(VOCs) in source emission by preconcentration/gas chromatography-mass spectrometry with FID detector

in combination with Deans Switch and cold oven technique.Samples were collected with a summa canister

and diluted before analysis.C2-C3 compounds were determined with FID

and quantified by external standard method.The remaining compounds were determined by mass spectrometry(MS)

and quantified by internal standard method.Results showed that the calibration curves for 118 VOCs exhibited good linearity in the concentration range of 0.5-30 nmol/mol

with the correlation coefficients(r2) of 0.995 3-0.999 9.The limits of detection and the limits of quantification were in the ranges of 0.01-0.38 μg·m-3 and 0.03-1.51 μg·m-3，respectively.The average recoveries at low

medium and high spiked levels ranged from 76.4%to 110%with the relative standard deviations(RSDs

n=7) of 0.30%-6.0%.The method was applied to the determination of VOCs in the exhaust gases of mobile source(forklift) and stationary sources(shoe factory

furniture factory

printery

plastic factory and shipyard).Different degrees of VOCs pollution were detected

in which concentrations of total VOCs(TVOC) in exhaust gases from the forklift and stationary sources were 33.50-35.25 mg·m-3 and 44.54-211.71 mg·m-3

respectively.The method was simple

rapid

stable

sensitive and accurate，and was suitable for the determination of VOCs in mobile and stationary source emissions.