Method 310.1

Alkalinity (Titrimetric, pH 4.5)

This method is used for the determination of alkalinity and is applicable to drinking, surface, and saline waters, domestic and industrial wastes. The method is suitable for all concentration ranges of alkalinity; however, appropriate aliquots should be used to avoid a titration volume greater than 50mL. An unaltered sample is titrated to an electrometrically determined end point of pH 4.5. The sample must not be filtered, diluted, concentrated, or altered in any way.

Substances such as salts of weak organic and inorganic acids present in large amounts may cause interference in the electrometric pH measurements.

(EPA: Office of Water)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   The sample should be run as soon as practical.
Preservatives:   The sample should be refrigerated at 4°C.
Required Preps:   100 mL amber glass bottle
Collection Method:   Grab sampling
Analytical Methodology:   Titration
Documentation:   310.1

Analyte List*

Analyte Formula CAS Number Detection Limit
Alkalinity, Total

* 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.