Determination of Technetium-99 in Environmental Samples by Solvent Extraction at Controlled Valence

Q.J. Chen; A. Aarkrog; H. Dick; K. Mandrup

Determination of Technetium-99 in Environmental Samples by Solvent Extraction at Controlled Valence

Q.J. Chen, A. Aarkrog, H. Dick, K. Mandrup

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Abstract

Distribution coefficients of technetium and ruthenium are determined under different conditions with CCl₄, cyclohexanone, and 5% tri-isooctylasine (TIOA)/xylene. A method for analyzing ⁹⁹Tc in environmental samples has been developed by solvent extraction in which the valences of technetium and ruthenium are controlled with H₂O₂, and NaC10. Technetium and ruthenium which are oxidized to TcO^-₄ and RuO^-₄ by NaC10 are separated by extraction with CC1₄ at pH=4. The RuO^-₄ is reduced to low valence and technetium is kept in the TcO^-₄ state with H₂O₂. Technetium, ruthenium, and other nuclides are subsequently separated by solvent extraction with cyclohexanone and 5% TIOA/xylene. The decontamination of the procedure is 1.35 x 10⁵ for ¹⁰³Ru and 1.66 x 105 for ^1l0mAg. The chemical yield of technetium-99 is 55%.

Original language	English

Place of Publication	Roskilde
Publisher	Risø National Laboratory
Number of pages	31
ISBN (Print)	87-550-1368-6
Publication status	Published - 1987

Series	Risø-M
Number	2671
ISSN	0418-6435

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Risø-M-2671

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title = "Determination of Technetium-99 in Environmental Samples by Solvent Extraction at Controlled Valence",

abstract = "Distribution coefficients of technetium and ruthenium are determined under different conditions with CCl4, cyclohexanone, and 5% tri-isooctylasine (TIOA)/xylene. A method for analyzing 99Tc in environmental samples has been developed by solvent extraction in which the valences of technetium and ruthenium are controlled with H2O2, and NaC10. Technetium and ruthenium which are oxidized to TcO-4 and RuO-4 by NaC10 are separated by extraction with CC14 at pH=4. The RuO-4 is reduced to low valence and technetium is kept in the TcO-4 state with H2O2. Technetium, ruthenium, and other nuclides are subsequently separated by solvent extraction with cyclohexanone and 5% TIOA/xylene. The decontamination of the procedure is 1.35 x 105 for 103Ru and 1.66 x 105 for 1l0mAg. The chemical yield of technetium-99 is 55%.",

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T1 - Determination of Technetium-99 in Environmental Samples by Solvent Extraction at Controlled Valence

AU - Chen, Q.J.

AU - Aarkrog, A.

AU - Dick, H.

AU - Mandrup, K.

PY - 1987

Y1 - 1987

N2 - Distribution coefficients of technetium and ruthenium are determined under different conditions with CCl4, cyclohexanone, and 5% tri-isooctylasine (TIOA)/xylene. A method for analyzing 99Tc in environmental samples has been developed by solvent extraction in which the valences of technetium and ruthenium are controlled with H2O2, and NaC10. Technetium and ruthenium which are oxidized to TcO-4 and RuO-4 by NaC10 are separated by extraction with CC14 at pH=4. The RuO-4 is reduced to low valence and technetium is kept in the TcO-4 state with H2O2. Technetium, ruthenium, and other nuclides are subsequently separated by solvent extraction with cyclohexanone and 5% TIOA/xylene. The decontamination of the procedure is 1.35 x 105 for 103Ru and 1.66 x 105 for 1l0mAg. The chemical yield of technetium-99 is 55%.

AB - Distribution coefficients of technetium and ruthenium are determined under different conditions with CCl4, cyclohexanone, and 5% tri-isooctylasine (TIOA)/xylene. A method for analyzing 99Tc in environmental samples has been developed by solvent extraction in which the valences of technetium and ruthenium are controlled with H2O2, and NaC10. Technetium and ruthenium which are oxidized to TcO-4 and RuO-4 by NaC10 are separated by extraction with CC14 at pH=4. The RuO-4 is reduced to low valence and technetium is kept in the TcO-4 state with H2O2. Technetium, ruthenium, and other nuclides are subsequently separated by solvent extraction with cyclohexanone and 5% TIOA/xylene. The decontamination of the procedure is 1.35 x 105 for 103Ru and 1.66 x 105 for 1l0mAg. The chemical yield of technetium-99 is 55%.

KW - Risø-M-2671

M3 - Report

SN - 87-550-1368-6

T3 - Risø-M

BT - Determination of Technetium-99 in Environmental Samples by Solvent Extraction at Controlled Valence

PB - Risø National Laboratory

CY - Roskilde

ER -

Determination of Technetium-99 in Environmental Samples by Solvent Extraction at Controlled Valence

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