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Carbon Dioxide (Dissolved) Test Kits

Titrimetric Kits

Range MDL Method Type Kit Cat. No. Refill
10 - 100 ppm 10 ppm Caustic Titrant with pH Indicator Titrets K-1910
100 - 1,000 ppm 100 ppm Caustic Titrant with pH Indicator Titrets K-1920
250 - 2,500 ppm 250 ppm Caustic Titrant with pH Indicator Titrets K-1925

CHEMetrics offers test kits employing the Caustic Titrant with pH indicator method 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 Caustic Titrant with pH Indicator Method

CHEMetrics' carbon dioxide test kits employ a sodium hydroxide titrant and phenolphthalein indicator. Results are expressed as ppm (mg/l) CO2.

APHA Standard Methods, 22nd ed., Method 4500-CO2 C -1997. ASTM D 513-82, Total and Dissolved Carbon Dioxide in Water, Test Method E.

Technical Data Sheet


CO2 is produced by aerobic respiration in animals, decay of organic matter, decomposition of some minerals and wild fires. Surface waters typically contain less than 10 ppm dissolved CO2, while groundwaters, particularly if deep, may contain several hundred ppm. In unpolluted waters, carbon dioxide is a major source of acidity.

Carbon dioxide is often measured to assess the health of natural bodies of water. Water pollution and air pollution may cause elevated seawater CO2 levels and thus lower pH levels. High concentrations of CO2 could indicate pollution and danger to aquatic life. To ensure safety of aquatic life, carbon dioxide is often measured in the aquaculture industry as well.

What is Carbon Dioxide?

Carbon dioxide (CO2) is a molecule with one carbon attached to two oxygen atoms with covalent bonds and is 53% heavier than dry air. It makes up 0.04% of the earth's atmosphere (421 ppm or mg/l). CO2 is absorbed from the atmosphere by carbon sinks as part of the carbon cycle, which include plant photosynthesis, and absorption by soil and water bodies. When dissolving in water it forms carbonic acid, lowering the water's pH.