NEMI Method Summary


Method Summary Information

Method Number:

215.2

Media:

WATER

Revision:

Issued 1974; Editorial Revision 1978

Method Source:

U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL]

Analytes in this method

Subcategory:

INORGANIC

Official Name:

Calcium (Titrimetric, EDTA)

Descriptive Name

Calcium by Titrimetry

Source Info:

U.S.EPA National Exposure Research Laboratory (NERL)
Microbiological and Chemical Exposure Assessment Research Division (MCEARD)
[formerly the Environmental Monitoring Systems Laboratory (EMSL), Cincinnati, OH]
26 West Martin Luther King Drive
Cincinnati, Ohio 45268-0001
Fax: 513-569-7757
email: DWmethods.help@epa.gov

Citation:

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

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Brief Method
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 And
Application:

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

Applicable
Conc Range:

0.5-25 mg/L as Ca(CO)₃.

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.

Sample Handling:

None.

Max Holding Time:

6 months (MCAWW, Table 1).

Sample Prep Met

None.

Relative Cost:

Less than $50

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Method Summary Information