EPA-NERL: 218.1:  Chromium by Flame AA

  • Summary
  • Analytes
  • Revision
  • Data and Sites
Official Method Name
 Chromium (Atomic Absorption, Direct Aspiration)
Current Revision
Issued 1971; Editorial Revision 1974 and 1978
Media
 WATER
Instrumentation
 Flame Atomic Absorption
Method Subcategory
 Inorganic
Method Source
  EPA-NERL
Citation
  Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)
Brief Method 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 and Application
 This method determines chromium by flame atomic absorption spectrometry. Sample pretreatment according to EPA Method 200.0 determines the applicability.
Applicable Concentration Range
 500-10,000 ug/L (optimal range); 250 ug/L (sensitivity).
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.
Quality Control Requirements
 QC requirements for drinking water procedures are provided in method 200.0
Sample Handling
 Sample handling and preservation procedures are provided in EPA Method 200.0.
Maximum Holding Time
 6 months (MCAWW, Table 1).
Relative Cost
 Less than $50
Sample Preparation Methods
 200.0
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