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) dissolved CO2, while ground waters, particularly if deep, may contain several hundred ppm (mg/L). Carbon dioxide concentration greatly impacts pH. In unpolluted waters, carbon dioxide is a major source of acidity.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.