EPA Method 208.1

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EPA Method 208.1:
Barium by Flame AA. Official Name: Barium (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 barium 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) 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).

Media:
WATER

Subcategory:
Inorganic

Concentration:
1,000 - 20,000 ug/L (optimal range); 400 ug/L (sensitivity).

Sample Prep:
200

Precision:
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.

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

Revision Number:
Issued 1974