A method was developed for the si-multaneous analysis of trace arsine and phosphine in ethylene and propylene products by gas chromatog-raphy-atomic emission spectroscopy detector and the chromatographic analysis conditions were optimized,and the detection limit,linear range,recovery rate and repeatability of the method were investigated.The results showed that the detection limit of the method for arsine was as low as 0.02 mL/m3,the linear correlation coefficient was more than 0.999 in the volume concentration range of 0.02～2 090 mL/m3,the recovery rate was 87.60％and the relative stan-dard deviation of the 3 parallel measurements was 1.83％.The detection limit of phosphine was as low as 0.03 mL/m3,the correlation coefficient was greater than 0.999 in the volume concentration range of 0.03～3 010 mL/m3,the recovery rate was 106.13％and the relative standard deviation of the 3 parallel measurements was 3.39％.The method can be used as a control analysis method for trace arsine and phosphine in ethylene and propylene products.
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