Utilize the single factor experiment to confirm that the optimum test conditions as: In the pH 4.0 medium of buffer solution of NaAc-HAc, 3mL 0.04% solution of color reagent 5-Br-PADAP, 2mL 10% solution of nonionic surfactant OP.

• 在pH4.；0 NaAc-HAc缓冲溶液中，选用0