“…Frierson and Jones (8) used radioactive tracers in paper-partition chromatography of inorganic ions and detected their loci by autoradiography and counting techniques. However, uranium(VI) was not among the cations which they studied. Polarography with high-sensitivity instruments (10) may be the most precise method and activation analysis (9) the most sensitive method for the quantitative determination of submicrogram amounts of uranium. These methods are being investigated at this laboratory for the determination of the chromatographically isolated uranium.…”