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Chlorine Dioxide Test Kit

Visual Kit

Range MDL Method Type Kit Refill
0.0 - 2 & 0 - 10 ppm 0.1 ppm DPD CHEMets K-2705 R-7404

CHEMetrics offers a test kit employing the well-known DPD reagent to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.

The DPD Method

In the standard DPD methodology, chlorine dioxide reacts with DPD (N, N-diethyl-p-phenylenediamine) to form a pink product. Interference from free Cl2 is prevented (up to 6 ppm Cl2) by the addition of glycine to the sample. Results are expressed as ppm (mg/l) ClO2.

USEPA Methods for Chemical Analysis of Water and Wastes, Method 330.5 (1983).
APHA Standard Methods, 20th ed., Method 4500- ClO2 D -1993 and 22nd Ed., Method 4500-Cl G- 2000.

Technical Data Sheet


Chlorine dioxide (ClO2) is used as an oxidising microbiocide in industrial cooling water treatment, the dairy, livestock and meat industries, and many other food and beverage industry applications. It is used as a bleaching agent in the pulp and paper industry, and as a disinfectant in municipal water treatment. Industrial waste treatment facilities use ClO2 because of its selectivity for certain compounds, including phenols, sulphides, cyanides, thiosulphates, and mercaptans. It is also often favored over chlorine as a disinfectant because it does not create as many toxic disinfection by-products (DBPs). The oil and gas industry uses ClO2 for downhole applications and as a stimulation enhancement additive. The Maximum Residual Disinfectant Level (MRDL) for ClO2 in drinking water set out by the DWI for England and Wales is 0.5 mg/l (ppm). In the US, the MRDL set by the EPA for CLO2 in drinking water is 0.8 mg/l.

Since chlorine dioxide is used as a disinfectant, it is typically measured to determine whether water disinfection programs are performing efficiently. Having high levels of chlorine dioxide indicates an overuse of chemical leading to lost profit while low levels represent inadequate disinfection.

What is Chlorine Dioxide?

ClO2 exists as a red-brown liquid between 11°C and -59°C and a yellow-green gas above 11°C. Both Chlorine and oxygen are non-metals and is held together by covalent bonds. It is a strong oxidising agent and appears to be more effective at disinfecting coliform than chlorine. It is commonly produced by the reduction of chlorate (e.g. sodium chlorate in a sulphuric acid solution reduced by hydrogen peroxide). ClO2 can rapidly decompose in air into chlorine and oxygen. It is generally produced where it is to be used as it cannot be stored for too long as a refrigerated liquid.