本文采用冲洗吸附色谱法分离试样中的芳烃、二烯烃等干扰组份。然后以烯—碘络合物紫外吸收法测定烷—烯馏份中的单烯含量。同时，从样品中制备标准单烯并测定其吸收系数和回收常数，并讨论了络合物的紫外吸收、干扰、光化学效应和碘浓度的影响等。 In this paper, flushing adsorption chromatography separation of aromatics samples, dienes and other interference components. The mono-olefin content in the alkane-ene fraction was then determined by the olefin absorption spectrophotometry. At the same time, standard mono-olefins were prepared from the samples and their absorption coefficients and recovery constants were determined. The effects of UV absorption, interference, photochemical effect and iodine concentration of the complexes were also discussed.