NEMI Method Summary


Method Summary Information

Method Number:

903.1

Media:

WATER

Revision:

August 1980

Method Source:

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

Analytes in this method

Subcategory:

RADIOCHEMICAL

Official Name:

Radium-226 in Drinking Water (Radon Emanation Technique)

Descriptive Name

Radium-226 in Drinking Water

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:

EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)

92456

Byte file

Brief Method
Summary:

The radium-226 in the drinking water sample is concentrated and separated by coprecipitation on barium sulfate. The precipitate is dissolved in EDTA reagent, placed in a sealed bubbler and stored for ingrowth of radon-222. After ingrowth, the gas is purged into a scintillation cell. When the short-lived radon-222 daughters are in equilibrium with the parent (4h), the scintillation cell is counted for alpha activity.

Scope And
Application:

This method covers the measurement of radium-226 in drinking water samples. This method is specific for radium-226, and is based on the emanation and scintillation counting of radon-222, a daughter product of radium-226.

Applicable
Conc Range:

None given.

Interferences:

(1) Voids above the bubbler must be kept very small. (2) Build-up of radon daughter products in the cell. (3) Cell background.

QC Requirements:

Not Included

Sample Handling:

See Section 3 of Method 900.0.

Max Holding Time:

Relative Cost:

$51 to $200

4732

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Method Summary Information