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View Actual EPA Method 208.1 (PDF File)
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