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View Actual EPA Method 218.1 (PDF File)
EPA Method 218.1:Chromium by Flame AA. Official Name: Chromium (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 chromium 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) Suppression: The suppression of chromium absorption in fuel-rich, air-acetylene flames is controlled by the addition of 1% ammonium bifluoride in 0.2% of sodium sulfate.(B) Metals: Chemical and matrix interferences from iron nickel and other metals can occur when using a fuel rich air acetylene flame.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:500-10,000 ug/L (optimal range); 250 ug/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:The DL is to be considered the minimum working limit achievable with this method.
Revision Number:Issued 1971; Editorial Revision 1974 and 1978