EPA Method 310.2

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EPA Method 310.2:
Alkalinity by Autoanalyzer. Official Name: Alkalinity (Colorimetric, Automated, Methyl Orange)

Summary:
Methyl orange is used as the indicator in this method because its pH range is in the same range as the equivalence point for total alkalinity, and it has a distinct color change that can be easily measured. The methyl orange is dissolved in a weak buffer at a pH of 3.1, just below the equivalence point, so that any addition of alkalinity causes a loss of color directly proportional to the amount of alkalinity.

Scope:
This automated method is applicable to drinking, surface, and saline waters; domestic and industrial wastes.

Citation:
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

Interferences:
Sample turbidity and color may interfere with this method. Turbidity must be removed by filtration prior to analysis. Sample color that absorbs in the photometric range used will also interfere.

QC Requirements:
None.

Maximum Holding Time:
14 days.

Media:
WATER

Subcategory:
Inorganic

Concentration:
10 to 200 mg/L as CaCO3.

Sample Prep:
None.

Precision:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Detection:
None.

Revision Number:
Issued 1971; Editorial Revision 1974