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C. André, Gregory R. Choppin

Reduction of Pu(V) by humic acid

The reduction of Pu(V) by humic acid in the presence of divalent cations (calcium and magnesium) was investigated. Tracer concentrations of ²³⁸Pu were used (ca. 10^-10 M). Experiments were run in 5 m NaCl in the dark at pcH values of 6 and 8 with humic acid concentrations between 0 and 10 ppm. The redox speciation of plutonium was determined by solvent extraction methods. The reduction of Pu(V) by humic acid in the absence of divalent cations was investigated also with samples exposed to light prior to or after the introduction of plutonium. The presence of divalent cations, as well as light exposure increased the reduction of Pu(V), compared to when experiments were run in the dark without divalent cations.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 09/2000
Pages: 613

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