Hydrogen peroxide is a strong oxidizing agent with a variety of uses. It is commercially available as a liquid in various concentrations. Applications include the treating of industrial effluents and domestic waste, and as a disinfectant in aseptic packaging.

The Colorimetric Methods. CHEMetrics offers products based on the thiocyanate reagent and the DDPD^tm reagent. 

   The Thiocyanate method consists of ammonium thiocyanate and ferrous iron in acid solution. Hydrogen peroxide oxidizes ferrous iron to the ferric state, resulting in the formation of a red thiocyanate complex. Chlorine will not interfere with this method. Ferric iron will interfere.Results are expressed as ppm (mg/L) H₂O₂.

   The DDPD^tm method is derived from the DPD method. It offers greater sensitivity and fewer interferences than the thiocyanate method. Hydrogen peroxide reacts with DDPD in the presence of potassium iodide to form a blue reaction product. Results are expressed as ppm (mg/L) H₂O₂.

The Titrimetric Method employs ceric sulfate as the titrant and ferroin as the end point indicator. A color change from green to orange signals the end of the titration.  Results are expressed as percent (%) H₂O_2.

The Ceric Sulfate Go-No-Go Method.  This pass/fail hydrogen peroxide test was developed as an efficacy test for hydrogen peroxide based disinfecting solutions with an MEC (Minimum Effective Concentration) of 6.0+/-1.0%. The kit includes a precision pipetting device that is used to dispense sample into a reagent solution(ceric sulfate and ferroin) contained in a vial. An orange color in the vial indicates that the hydrogen peroxide concentration is greater than 6.0%. A blue or green color in the vial indicates that the hydrogen peroxide concentration is less than 6.0%.