EPA Method 215.1

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

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.

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

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

(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).



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

Sample Prep:

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


Revision Number:
Issued 1971; Editorial Revision 1974

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Examples:  8260

Examples:  Dioxin
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