|Range||MDL||Method||Kit Catalog No.||Refill Catalog No.|
|0-0.5 ppm||0.025 ppm||DPD||K-5502||R-5502|
|0-0.8 & 1-10 ppm||0.05 ppm||Ferric Thiocyanate||K-5510||R-5510|
|0-25 & 30-300 ppm||5 ppm||Ferric Thiocyanate||K-5510D||R-5510D|
|0-50 & 60-600 ppm||10 ppm||Ferric Thiocyanate||K-5510A||R-5510A|
|0-100 & 120-1200 ppm||20 ppm||Ferric Thiocyanate||K-5510B||R-5510B|
|0-1000 & 1200-12,000 ppm||200 ppm||Ferric Thiocyanate||K-5510C||R-5510C|
|0.1-1.0% (up to 20% with dilution)||0.10%||Ceric Sulfate Titrant with Ferroin Indicator||K-5530|
|Range||Method||Kit Catalog No.|
|0-6.00 ppm||Ferric Thiocyanate||K-5543|
|0-6.00 ppm||Ferric Thiocyanate||I-2016|
Hydrogen peroxide is a strong oxidizing agent with a variety of uses. Applications include the treating of industrial effluents and domestic waste and serving as a disinfectant in aseptic packaging.
For the food and beverage industry, CHEMetrics Hydrogen Peroxide CHEMets® and Vacu-vials® products are used extensively to monitor sterilization solutions in the packaging and sanitizing processes.
The Ferric Thiocyanate Method
Reference: D. F. Boltz and J. A. Howell, eds., Colorimetric Determination of Nonmetals, 2nd. ed., Vol. 8, p. 304 (1978).
The ferric 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 and peracetic acid will interfere. Results are expressed as ppm (mg/L) H2O2.
Hydrogen Peroxide Analysis in the Presence of Peracetic Acid
The DPD Method
References: USEPA Methods for Chemical Analysis of Waters and Wastes, Method 330.5 (1983). APHA Standard Methods, 21st ed., Method 4500-Cl G (2005). D.F. Boltz and J.A. Howell, eds., Colorimetric Determination of Nonmetals 2nd ed., Vol. 8, p. 303 (1978).
With the DPD Method, hydrogen peroxide reacts with DPD (N, N-diethyl-p-phenylenediamine) in the presence of potassium iodide and ammonium molybdate to form a pink color. Various oxidizing agents such as halogens, ozone, and peracetic acid will produce high test results. Results are expressed as ppm (mg/L) H2O2.
The Ceric Sulfate Titrimetric Method
Reference: Developed by CHEMetrics, Inc.
CHEMetrics developed a titrimetric method using 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 (%) H2O2. The test range can be modified by performing a sample dilution. Details are provided in the kit instructions for ranges of 0.01 - 0.1% through 2- 20%.