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Effect of Inorganic and Organic Compounds on the Extractability of ²³⁹Pu from an Artificially Contaminated Soil¹

ABSTRACT

The effect of a number of inorganic and organic compounds on the extractability of ²³⁹Pu from a contaminated soil has been examined. This has been done on an artificially contaminated kaolinitic soil by using the equilibrium batch method of extraction. Among the 21 inorganic compounds examined, NaHPO₄ showed the least ²³⁹Pu extractability (0.07% of dose) and Na₄P₂O₇ showed the greatest extractability (28.59% of dose). The compounds that showed relatively high ²³⁹Pu extractability included NaF, Na₂B₄O₇, Na₄P₂O₇, Na₂CO₃, Na₂O₂, NaOH, and NH₄OH. Among the organic compounds, the order of ²³⁹Pu extractability was Na acetate < Na formate < Na oxalate < Na tartrate < Na citrate. A 0.004M DTPA solution was a more effective extractant than a 0.08M citric acid solution. Aside from the chemical nature of these compounds, the ²³⁹Pu extractability was influenced by soil and extractant pH, soil organic matter, equilibrium time, soil weight/extractant volume ratio, and wet-dry pretreatment of the soil.

Key Words: pH • organic matter • equilibration time • soil weight/extractant volume ratio • inorganic extractant • organic extractant

¹ Contribution from Lab. of Nucl. Med. and Radiat. Biol., Univ. of California, Los Angeles, Calif. Supported by Contract EY-76-C-0012 between the Energy Res. Dev. Admin. and the Univ. of California.

² Research Soil Scientist and Research Associates, respectively.

Received for publication February 28, 1977.