Abstract
A solvent-extraction procedure for the determination of manganese-54 in sea water is described. The water (1 l) is buffered to pH 3.8, and extracted with di(2-ethylhexyl)phosphoric acid in n-heptane. The manganese-54 with carrier is stripped from the organic phase, and eventually precipitated as the dioxide; the precipitate is dissolved in hydrochloric acid and counted in a scintillation counter. Chemical recovery is determined colorimetrically. Samples spiked with manganese-54 showed quantitative recovery from 1 l of sea water with a typical recovery of 70–75% of carrier. The method is applicable to sea water containing many other ions, and decontamination factors for a wide range of radionuclides are reported. The limit of detection is ca. 10 -8 μCi ml -1.
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