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Chlorine Dioxide Test Kits

Chloride Dioxide Test Kits

Click on a catalog number in the tables below for more information or to purchase a test kit.

Visual Kits

Range MDL Method Kit Catalog No. Refill Catalog No.
0-2 & 0-10 ppm 0.1 ppm DPD K-2705 R-2705

Instrumental Kits

Range Method Kit Catalog No.
0-11.0 ppm DPD K-2703
0-11.0 ppm DPD I-2005


Chlorine dioxide is used as an oxidizing microbiocide in industrial cooling water treatment, the dairy industry, the meat industry, 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 chlorine dioxide because of its selectivity for certain compounds, including phenols, sulfides, cyanides, thiosulfates, and mercaptans. The oil and gas industry uses chlorine dioxide for downhole applications and as a stimulation enhancement additive. The Maximum Residual Disinfectant Level for chlorine dioxide is 0.8 mg/L in drinking water.

The DPD Method

References: USEPA Methods for Chemical Analysis of Water and Wastes, Method 330.5 (1983). APHA Standard Methods, 20th ed., Method 4500- ClO D -1993 and 23rd ed., Method 4500-Cl G-2000. 
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.