NEMI Method Summary


Method Summary Information

Method Number:

7500-RA-D

Media:

WATER

Revision:

Standard Methods Online

Method Source:

Standard Methods

Subcategory:

RADIOCHEMICAL

Analytes in this method

Official Name:

Radium in Water by Sequential Precipitation and Internal Proportional Counter or Scintillation Counter

Descriptive Name

Radium in Water by Sequential Precipitation

Source Info:

Standard Methods Online is jointly produced by the American Public Health Association (APHA), the American Water Works Association (AWWA), and the Water Environment Federation (WEF).
These organizations may be contacted by phone for more information on Standard Methods Online:
APHA: (301) 893-1894
AWWA: (800) 926-7337, (1-303-794-7711, outside U.S. / Canada)
WEF: (800) 666-0206 (1-703-684-2452 outside U.S. / Canada)

Citation:

Standard Methods Online

Brief Method
Summary:

Ra-228 and Ra-226 in water are concentrated and separated by coprecipitation with sulfates of lead and barium and purified by EDTA chelation. After 36-hour ingrowth of actinium-228 from radium-228, actinium-228 is carried on yttrium oxalate, purified, and beta-counted. Radium-226 in supernatant is precipitated as sulfate, purified, and alpha-counted (per 7500-Ra B) or it is transferred to a radon bubbler and determined by an emanation procedure (per 7500-Ra C; the preferred method).

Scope And
Application:

This proposed method determines soluble radium 228 alone or soluble radium 228 plus radium 226.

Applicable
Conc Range:

None given.

Interferences:

QC Requirements:

(see Section 1020 of Standard Methods for general QC requirements)

Sample Handling:

Add 2 mL concentrated HNO3/L sample at the time of collection or immediately after filtration. No other sample collection, preservation, or storage information is given.

Max Holding Time:

Relative Cost:

$51 to $200

URL to obtain ordering information for this method:

http://www.standardmethods.org/

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Method Summary Information