NEMI Method Summary


Method Summary Information

Method Number:

218.1

Media:

WATER

Revision:

Issued 1971; Editorial Revision 1974 and 1978

Method Source:

U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL]

Analytes in this method

Subcategory:

INORGANIC

Official Name:

Chromium (Atomic Absorption, Direct Aspiration)

Descriptive Name

Chromium by Flame AA

Source Info:

U.S.EPA National Exposure Research Laboratory (NERL)
Microbiological and Chemical Exposure Assessment Research Division (MCEARD)
[formerly the Environmental Monitoring Systems Laboratory (EMSL), Cincinnati, OH]
26 West Martin Luther King Drive
Cincinnati, Ohio 45268-0001
Fax: 513-569-7757
email: DWmethods.help@epa.gov

Citation:

Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

12025

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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
Conc 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.

QC 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.

Max Holding Time:

6 months (MCAWW, Table 1).

Sample Prep Met

200.0

Relative Cost:

Less than $50

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Method Summary Information