Method for measuring permanganate index in water

The invention relates to the technical field of substance analysis and detection, and discloses a method for determining a permanganate index in water. The method comprises the following steps: sucking 100mL of fully shaken and uniformly mixed sample, putting the sample into a 250mL conical flask, adding 4.5-5.5 mL of sulfuric acid solution, adding 10mL of potassium permanganate solution with the concentration of 0.01 mol/L by using a burette, uniformly shaking, and putting the conical flask into a boiling water bath for 40-107 min, wherein according to different Tibet altitudes and different water bath boiling points, the sample boiling water bath duration is 45 minutes in Lhasa, Shangnan and Linzhi respectively, the sample boiling water bath duration is 55 minutes in Rikaze, the sample boiling water bath duration is 40 minutes in Changdu, the sample boiling water bath duration is 81 minutes in Ngari Prefecture, and the sample boiling water bath duration is 107 minutes in Naqu; titrating the sample; performi