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View Actual EPA Method 215.1 (PDF File)
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