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View Actual EPA Method 215.2 (PDF File)
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