This method measures the mineral acidity of a sample plus the acidity resulting from oxidation and hydrolysis of polyvalent cations, including salts of iron and aluminum. The pH of the smaple is determined and a measured amount of standard acid is added as need to lower the pH to 4 or less. Hydrogen peroxide is added, the solution is boiled, cooled and then titrated electrometrically with a standard alkali to pH 8.2.
This method is applicable to surface waters, sewages and industrial wastes, particularly mine drainage and receiving streams, and other waters containing ferrous iron or other polyvalent cations in a reduced state.
The method covers the range from approximately 10 mg/L acidity to approximately 1000 mg/L as calcium carbonate, using a 50 mL sample.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 14 days from sample collection to analysis. |
| Preservatives: | None noted in method but refrigeration to 4°C is recommended. |
| Required Preps: | 100 mL amber glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Titration |
| Documentation: | 
305.1
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Acidity | 10 |
mg/L | ||
* 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.