EPA Method 215.2

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EPA Method 215.2:
Calcium by Titrimetry. Official Name: Calcium (Titrimetric, EDTA)

Summary:
Calcium ion is sequestered upon the addition of disodium dihydrogen ethylenediamine tetraacetate (EDTA). The titration end point is detected by means of an indicator which combines with calcium only.

Scope:
This method determines calcium in drinking and surface waters, domestic and industrial wastes.

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

Interferences:
Metals: Strontium and barium interfere in excess of 30 mg/L and may cause an indistinct end point. Magnesium can also interfere, but is eliminated by raising the pH to 12-13 to precipitate magnesium hydroxide.

QC Requirements:
None.

Maximum Holding Time:
6 months (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.5-25 mg/L as Ca(CO)3.

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 1974; Editorial Revision 1978