Abstract
In this redox-based direct potentiometric method, thorium is titrated with ethylenediaminetetraacetic acid (EDTA) in the presence of the Cu(II)—EDTA complex and ammonium thiocyanate. The indicator electrode is platinum. Solutions of irradiated thorium fuel, with less than 25 μmol in a sample aliquot, can be titrated. Solutions used to dissolve thorium samples contain aluminum, which can be masked kinetically, by pH adjustment, or with oxalate. Metal ions forming EDTA complexes with stability constants similar to or greater than that of copper(II) interfere.
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