Method for simultaneously determining NaHS and Na2S in PPS slurry mother liquor by using high performance liquid chromatography

The invention discloses a method for simultaneously determining NaHS and Na2S in a PPS slurry mother liquor by using a high performance liquid chromatography, which comprises the following steps: (1) preparing a sample solution: taking the PPS slurry mother liquor, adding water to a constant volume, filtering to obtain a filtrate, dividing the filtrate into two parts, adding ultrapure water with the same volume into one part, and recording as a sample solution a1; adding an isometric deriving agent into the other part, carrying out derivatization reaction, and recording as a sample solution a2; (2) preparing a reference substance solution: respectively taking NaHS and Na2S, adding water to dissolve and fix the volume, and filtering for later use; high performance liquid chromatography is adopted, mobile phases comprise a mobile phase A and a mobile phase B, the mobile phase A is selected from acetonitrile, and the mobile phase B is selected from a mixed solution of ammonium formate and a formic acid buffer so