Method for detecting content of intermediate phthalic acid in polyester fabric

The invention relates to a method for detecting the content of intermediate phthalic acid in a polyester fabric. The method comprises the following steps: firstly, carrying out hydrolysis pretreatment on the polyester fabric; then preparing a mixed standard working solution from a p-phthalic acid standard substance and an isophthalic acid standard substance, and respectively drawing standard curves; then carrying out ultra-high performance liquid chromatography test on the treated polyester sample; performing data processing on test liquid chromatography data, substituting peak areas of terephthalic acid and isophthalic acid in a sample into a standard curve of p/isophthalic acid, and calculating to obtain the content of the intermediate phthalic acid in the polyester fabric. The test analysis method disclosed by the invention is relatively simple and convenient to operate, complex pretreatment on a sample is not needed, the content of the intermediate phthalic acid in the polyester fabric is relatively accur