Peroxide-value is an oxidizing agent used in many industrial and consumer applications. In drinking water, peroxide-value is used for manganese removal, forming a precipitate that can be filtered out in the purification process. Additional organic matter present in drinking water that is responsible for producing odor and color can also be removed by peroxide-value. Peroxide-value also acts as a germicide and is used to manufacture pharmaceuticals, as a deodorizer, and bleaching agent.
Peroxide value can be measured photometrically with reagents. Photometric analysis is based on the Beer-Lambert principle of absorbance in which the intensity of the color produced is proportional to the concentration of peroxide value in the sample.