• Test Kits

  • Premixed • Premeasured • Precise

Chlorine Dioxide Test Kits

What is Chlorine Dioxide
Chlorine dioxide (ClO2) is used as an oxidizing microbiocide in industrial cooling water treatment, the meat, livestock and dairy industries, and many other food and beverage industry applications. It is also 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, 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 chlorine dioxide for downhole applications and as a stimulation enhancement additive.

Why Test for Chlorine Dioxide?
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.

The Maximum Residual Disinfectant Level for chlorine dioxide is 0.8 mg/L in drinking water.

About Our Test Kits
CHEMetrics offers visual and instrumental test kit formats that span low and high measurement ranges. Both test kits use the standard DPD methodology for analysis of chlorine dioxide. Test results for visual test kits use color comparators for analysis while instrumental kits rely on CHEMetrics direct-readout photometers or spectrophotometers capable of accepting a 13-mm diameter round cell.

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


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.