This method is for the determination of free carbon dioxide (CO2) from drinking water. The method describes a nomographic and itrimetric method for estimated of the free carbon dioxide. The sample is titrated potentiometrically or with a phenolphthalein indicator. The more rapid simple indicator method is satisfactory for field tests and for control and routine applications if the assumption is made the results obtained are, at best, an approximation. The nomographic method usually gives a closer estimation of the free CO2 when the pH and alkalinity determiantions are made immediately and correctly at the time of sampling. The pH measurement preferably should be made with an electrometric pH meter which is properly calibrated with standard buffer solution in the pH range of 7-8. The error resulting in inaccurate pH measurements grows with an increas in total alkalinity.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 24 hours from sample collection to analysis. |
| Preservatives: | Cool sample to 4°C. |
| Required Preps: | 250 mL amber glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Titration |
| Documentation: | |
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Carbon dioxide | CO2 |
124-38-9 |
7.5 |
% |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.