EPA Method 215.1


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EPA Method 215.1:
Calcium by Flame AA. Official Name: Calcium (Atomic Absorption, Direct Aspiration)

Summary:
A sample prepared according to EPA Method 200.0 is analyzed using a flame atomic absorption spectrometer. Specifications for instrument operation and preparation of standards are provided in the method.

Scope:
This method determines calcium by flame atomic absorption spectrometry. Sample pretreatment according to EPA Method 200.0 determines the applicability.

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

Interferences:
(A) Ionic Compounds: Phosphate, sulfate, and aluminum and anions can interfere, but are masked by the addition of lanthanum.Neutral pH: Results may be low if pH is above 7. Acidify samples and standards with dilute hydrochloric acid to overcome this interference.(C) Ionization: Ionization interferences should be controlled by adding large amounts of alkali to the sample.For additional interferences see EPA Method 200.0.

QC Requirements:
QC requirements for drinking water procedures are provided in method 200.0.

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

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.2-7 mg/L (optimal range); 0.08 mg/L (sensitivity).

Sample Prep:
200

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

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Examples:  8260
TO-15

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