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ASTM D4922-21

Current Revision

Standard Test Method for Determination of Radioactive Iron in Water

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1.1 This test method covers the determination of 55Fe in the presence of 59Fe by liquid scintillation counting. The a-priori minimum detectable concentration for this test method is 7.4 Bq/L.2

1.2 This test method was developed principally for the quantitative determination of 55Fe. However, after proper calibration of the liquid scintillation counter with reference standards of each nuclide, 59Fe may also be quantified.

1.3 This test method was used successfully with Type III reagent water conforming to Specification D1193. It is the responsibility of the user to ensure the validity of this test method for waters of untested matrices.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see Section 9.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 Fe-55 is formed in reactor coolant systems of nuclear reactors by activation of stable iron. The 55Fe is not completely removed by waste processing systems and some is released to the environment by means of normal waste liquid discharges. Power plants are required to monitor these discharges for 55Fe as well as other radionuclides.

5.2 This technique effectively removes other activation and fission products such as isotopes of iodine, zinc, manganese, cobalt, and cesium by the addition of hold-back carriers and an anion exchange technique. The fission products (zirconium-95 and niobium-95) are selectively eluted with hydrochloric-hydrofluoric acid washes. The iron is finally separated from Zn+2 by precipitation of FePO4 at a pH of 3.0.

SDO ASTM: ASTM International
Document Number D4922
Publication Date Dec. 15, 2021
Language en - English
Page Count 7
Revision Level 21
Supercedes
Committee D19.04
Publish Date Document Id Type View
Dec. 15, 2021 D4922-21 Revision
July 15, 2009 D4922-09 Revision
Aug. 10, 2001 D4922-94E01 Revision
Aug. 10, 2001 D4922-01 Revision
Jan. 1, 2016 D4922-09R16E01 Reaffirmation