Method for determining caprolactam content in ammonium sulfate by high performance liquid chromatography

The invention relates to a method for determining the content of caprolactam in ammonium sulfate by high performance liquid chromatography. The method comprises the following steps: step 1, preparinga standard solution; 2, preparing a sample solution; step 3, determining chromatographic conditions; step 4, sample determination; after the baseline of the instrument is stabilized; assay standard solution and sample solution, first determining standard solutions, continuously injecting a plurality of standard solutions with the same solubility until the area change of two adjacent standard solutions is less than 1.5%; measuring the sample solution, injecting two standard solutions with the same solubility into the sample solution with the same solubility, injecting a plurality of standard solutions with the same solubility until the area change of the two adjacent standard solutions is less than 1.5%, and injecting the sample solution between the two standard solutions after sample injection is finished; the met