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Title: Situ formation of apatite for sequestering radionuclides and heavy metals

Abstract

Methods for in situ formation in soil of a permeable reactive barrier or zone comprising a phosphate precipitate, such as apatite or hydroxyapatite, which is capable of selectively trapping and removing radionuclides and heavy metal contaminants from the soil, while allowing water or other compounds to pass through. A preparation of a phosphate reagent and a chelated calcium reagent is mixed aboveground and injected into the soil. Subsequently, the chelated calcium reagent biodegrades and slowly releases free calcium. The free calcium reacts with the phosphate reagent to form a phosphate precipitate. Under the proper chemical conditions, apatite or hydroxyapatite can form. Radionuclide and heavy metal contaminants, including lead, strontium, lanthanides, and uranium are then selectively sequestered by sorbing them onto the phosphate precipitate. A reducing agent can be added for reduction and selective sequestration of technetium or selenium contaminants.

Inventors:
 [1]
  1. (Edgewood, NM)
Issue Date:
Research Org.:
Sandia Corporation (Albuquerque, NM)
Sponsoring Org.:
USDOE
OSTI Identifier:
1007474
Patent Number(s):
6,592,294
Application Number:
10/008,769
Assignee:
Sandia Corporation (Albuquerque, NM) SSO
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Moore, Robert C. Situ formation of apatite for sequestering radionuclides and heavy metals. United States: N. p., 2003. Web.
Moore, Robert C. Situ formation of apatite for sequestering radionuclides and heavy metals. United States.
Moore, Robert C. Tue . "Situ formation of apatite for sequestering radionuclides and heavy metals". United States. https://www.osti.gov/servlets/purl/1007474.
@article{osti_1007474,
title = {Situ formation of apatite for sequestering radionuclides and heavy metals},
author = {Moore, Robert C.},
abstractNote = {Methods for in situ formation in soil of a permeable reactive barrier or zone comprising a phosphate precipitate, such as apatite or hydroxyapatite, which is capable of selectively trapping and removing radionuclides and heavy metal contaminants from the soil, while allowing water or other compounds to pass through. A preparation of a phosphate reagent and a chelated calcium reagent is mixed aboveground and injected into the soil. Subsequently, the chelated calcium reagent biodegrades and slowly releases free calcium. The free calcium reacts with the phosphate reagent to form a phosphate precipitate. Under the proper chemical conditions, apatite or hydroxyapatite can form. Radionuclide and heavy metal contaminants, including lead, strontium, lanthanides, and uranium are then selectively sequestered by sorbing them onto the phosphate precipitate. A reducing agent can be added for reduction and selective sequestration of technetium or selenium contaminants.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {7}
}

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