EPA Method 208.1

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EPA Method 208.1:
Barium by Flame AA. Official Name: Barium (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 barium 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) Ionization: Barium is easily ionized by the oxide-acetylene flame. Add potassium (1000 mg/L) to samples and standards to control this effect.(B) Acetylene-Air: If acetylene-air is used, phosphate, silicon, and aluminum will severely suppress the barium absorbance. This may be overcome by adding 2000 mg/L of lanthanum.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 - 20,000 ug/L (optimal range); 400 ug/L (sensitivity).

Sample Prep:

Precision and accuracy values were determined using analyses of fortified industrial-domestic waste effluent in a single laboratory. Additional values at 2000 ug/L, and multilaboratory values for a related Standard Method are provided in the method.

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

Revision Number:
Issued 1974