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Carbon Dioxide (dissolved) Test Kits

What is Carbon Dioxide?
Carbon dioxide (CO2) is a naturally occurring gas that can be found dissolved in water. Carbon dioxide ends up in surface and ground water as a result of animal respiration, decaying organic matter, and the decomposition of some minerals. Surface waters typically contain less than 10 ppm (mg/L) of dissolved CO2, while ground waters, particularly if deep, may contain several hundred ppm (mg/L). CO2 concentration in water greatly impacts pH. In unpolluted waters, carbon dioxide is a major source of acidity.

Why Test for Carbon Dioxide?
CO2 tests are often used to assess the health of natural bodies of water. High concentrations of dissolved CO2 could indicate pollution and danger to aquatic life. To ensure the safety of aquatic life, carbon dioxide in water is often measured in the aquaculture industry as well.

About our Test Kits
These CO2 test kits utilize CHEMetrics Titrets® ampoules. Titrets ampoules use a reverse titration technique to measure analyte concentration levels (titrant volume inside the ampoule is fixed while the sample volume is varied). After snapping the ampoule tip, sample is drawn into the test ampoule in small doses until a color change signals the endpoint has been reached. The titration is stopped at the end point, and the liquid level in the ampoule corresponds to the concentration printed on a scale on the ampoule’s outer surface. Three measurement ranges are presented in the table below.

Click on a catalog number in the tables below for more information or to purchase a C02 test kit.

Visual Kits

Range MDL Method Kit Catalog No. Refill Catalog No.
10-100 ppm 10 ppm Caustic Titrant with pH Indicator K-1910
100-1000 ppm 100 ppm Caustic Titrant with pH Indicator K-1920
250-2500 ppm 250 ppm Caustic Titrant with pH Indicator K-1925


The Caustic Titrant with pH Indicator Method

References: APHA Standard Methods, 23rd ed., Method 4500-COC-2004. ASTM D 513-82, Total and Dissolved Carbon Dioxide in Water, Test Method E.  CHEMetrics’ dissolved carbon dioxide (CO2) in water test kits employ a sodium hydroxide titrant and phenolphthalein indicator. Results are expressed as ppm (mg/L) CO2.