EPA-NERL: 218.4:  Hexavalent Chromium Using Chelation Extraction and AA

  • Summary
  • Analytes
  • Revision
  • Data and Sites
Official Method Name
 Chromium, Hexavalent (AA, Chelation Extraction)
Current Revision
Issued 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
 Hexavalent chromium is chelated with ammonium pyrrolidine dithiocarbamate (APDC) and the chelated chromium is extracted with methyl isobutyl ketone (MIBK). The concentration of hexavalent chromium in the extract is measured using a flame atomic absorption (FLAA) spectrophotometer.
Scope and Application
 This method determines dissolved hexavalent chromium in drinking waters, surface waters, saline waters, and certain domestic and industrial wastes.
Applicable Concentration Range
 10 - 250 ug/L
Interferences
 Reactive metals. High concentrations of reactive elements, generally found in wastewater only, can interfere with analysis.
Quality Control Requirements
 Not Provided
Sample Handling

Chelation and extraction should be carried out as soon as possible.

To retard the chemical activity of hexavalent chromium, the sample should be transported and stored until time of analysis at 4oC.
Maximum Holding Time
 Not Provided
Relative Cost
 Less than $50
Sample Preparation Methods
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