|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|
Dissolved carbon dioxide (CO2) is naturally present as a result of animal respiration, the decay of organic matter, and the decomposition of certain minerals. It is the major source of acidity in unpolluted water samples. 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).
The Caustic Titrant with pH Indicator Method
References: APHA Standard Methods, 22nded., Method 4500-CO2C -1997. ASTM D 513-82, Total and Dissolved Carbon Dioxide in Water, Test Method E.
CHEMetrics' carbon dioxide test kits employ a sodium hydroxide titrant and phenolphthalein indicator. Results are expressed as ppm (mg/L) CO2.