Formation of hydroxyapatite in soils using calcium citrate and sodium phosphate for control of strontium migration

Robert C. Moore, Charles A Sanchez, Kathleen Holt, Pengchu Zhang, Huifang Xu, Gregory R. Choppin

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

90Sr contamination is a major problem at several U.S. sites. At some sites, 90Sr has migrated deep underground making site remediation difficult. In this paper, we describe a novel method for precipitation of hydroxyapatite, a strong sorbent for 90Sr, in soil. The method is based on mixing a solution of calcium citrate and sodium phosphate in soil. As the indigenous soil microorganisms mineralize the citrate, the calcium is released and forms hydroxyapatite. Soil, taken from the Albuquerque desert, was treated with a sodium phosphate solution or a sodium phosphate/calcium citrate solution. TEM and EDS were used to identify hydroxyapatite with CO32- substitutions, with a formula of (Ca4.8Na0.2)[(PO4)2.8(CO 3)0.2](OH), in the soil treated with the sodium phosphate/calcium citrate solution. Untreated and treated soils were used in batch sorption experiments for Sr uptake. Average Sr uptake was 19.5, 77.0 and 94.7% for the untreated soil, soil treated with sodium phosphate, and soil with apatite, respectively. In desorption experiments, the untreated soil, phosphate treated soil and apatite treated soil released an average of 34.2, 28.8 and 4.8% respectively. The results indicate the potential of forming apatite in soil using soluble reagents for retardation of radionuclide migration.

Original languageEnglish (US)
Pages (from-to)719-723
Number of pages5
JournalRadiochimica Acta
Volume92
Issue number9-11
DOIs
StatePublished - 2004

Fingerprint

Calcium Citrate
Strontium
citrates
Durapatite
Hydroxyapatite
strontium
calcium
Calcium
soils
phosphates
Phosphates
Sodium
sodium
Soils
Apatites
Apatite
apatites
calcium phosphates
Calcium phosphate
sodium phosphate

Keywords

  • Apatite
  • Barrier
  • Hydroxyapatite
  • Immobilization
  • Radionuclide
  • Soils
  • Sorption
  • Strontium

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Nuclear Energy and Engineering

Cite this

Formation of hydroxyapatite in soils using calcium citrate and sodium phosphate for control of strontium migration. / Moore, Robert C.; Sanchez, Charles A; Holt, Kathleen; Zhang, Pengchu; Xu, Huifang; Choppin, Gregory R.

In: Radiochimica Acta, Vol. 92, No. 9-11, 2004, p. 719-723.

Research output: Contribution to journalArticle

Moore, Robert C. ; Sanchez, Charles A ; Holt, Kathleen ; Zhang, Pengchu ; Xu, Huifang ; Choppin, Gregory R. / Formation of hydroxyapatite in soils using calcium citrate and sodium phosphate for control of strontium migration. In: Radiochimica Acta. 2004 ; Vol. 92, No. 9-11. pp. 719-723.
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AB - 90Sr contamination is a major problem at several U.S. sites. At some sites, 90Sr has migrated deep underground making site remediation difficult. In this paper, we describe a novel method for precipitation of hydroxyapatite, a strong sorbent for 90Sr, in soil. The method is based on mixing a solution of calcium citrate and sodium phosphate in soil. As the indigenous soil microorganisms mineralize the citrate, the calcium is released and forms hydroxyapatite. Soil, taken from the Albuquerque desert, was treated with a sodium phosphate solution or a sodium phosphate/calcium citrate solution. TEM and EDS were used to identify hydroxyapatite with CO32- substitutions, with a formula of (Ca4.8Na0.2)[(PO4)2.8(CO 3)0.2](OH), in the soil treated with the sodium phosphate/calcium citrate solution. Untreated and treated soils were used in batch sorption experiments for Sr uptake. Average Sr uptake was 19.5, 77.0 and 94.7% for the untreated soil, soil treated with sodium phosphate, and soil with apatite, respectively. In desorption experiments, the untreated soil, phosphate treated soil and apatite treated soil released an average of 34.2, 28.8 and 4.8% respectively. The results indicate the potential of forming apatite in soil using soluble reagents for retardation of radionuclide migration.

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