This method is for the determination of the pH of aqueous wastes and multiphase wastes where the aqueous phase constitutes at least 20% of the total volume of the waste. The corrosivity of concentrated acids and bases, or of concentrated acids and bases mixed with inert substances, cannot be measured. The pH measurement requires some water content.
The pH of the sample is determined electrometrically using either a glass electrode in combination with a reference potential or a combination electrode. The measuring device is calibrated using a series of standard solutions of known pH.
NOTE: This method is an update of and replaces Method 9040B.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Samples should be analyzed as soon as possible per the method. |
| Preservatives: | None specified in the method. |
| Required Preps: | 50mL glass or plastic bottle with Teflon-lined lid. |
| Collection Method: | Grab sampling |
| Analytical Methodology: | pH Meter |
| Documentation: | 
9040C
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| pH | 0.1 |
pH unit | ||
* 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.