EPA Method 204.1

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EPA Method 204.1:
Antimony by Flame AA. Official Name: Antimony (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 antimony 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) Lead: A spectral interference from lead occurs at 217.6 nm. If lead is at a level of 1000 mg/L or higher use the 231.1 nm antimony line.(B) Acid: Increasing acid concentrations decrease antimony absorption. Match acid concentrations of samples and standards to avoid inaccurate results.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).



1,000-40,000 ug/L (optimal range); 500 ug/L (sensitivity).

Sample Prep:

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

The DL is to be considered the minimum working limit achievable with this method.

Revision Number:
Issued 1974; Editorial Revision 1978

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Examples:  8260

Examples:  Dioxin
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