The performance of diethyl phthalate(DEP)as an internal standard for measuring dibutyl phthalate(DBP)content was studied.Through rigorous experimental design,precise data measurement,and in-depth analysis and demonstration,the accuracy and stability of DEP as an internal standard have been fully verified.DEP as an internal standard for DBP,can accurately measure the content of DBP with a standard deviation of 0.00233602 and a coefficient of variation of 0.56524％.This method was used to test the DBP content of the lean solvent in the post stripping kettle of green low-carbon butane method for the production of maleic anhydride.The results still showed a good linear relationship,and the mixture of diethyl phthalate and the lean solvent in the post stripping kettle was stable,providing a reliable method for accurate determination of DBP content.
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