Determination of Cerium Photometric Method with Radiometric Correction

Abstract

A characteristic polarogram of four different refined sugars, at a concentration of 26 grams in 100 ml., is shown in Figure 1 (conditions as in Table I), depicting the following results: Curve h, µ&.

Nucleonics

“…Freedman and Hume (44) determined cerium in mixtures of rare earths and other elements by separating a part of the cerium in pure form for a spectrophotometric determination. By adding a known amount of radioactive cerium to the sample (isotopic dilution analysis) before the separation, the efficiency of the recovery was determined by measurement of the activity of the separated cerium, and hence the original content could be calculated.…”

“…To avoid evaporation of liquid samples in a planchet cup, a lacquer film may be placed on the surface of the liquid (44)•…”

Ultraviolet Absorption Spectrophotometry

“…Their paper includes a study of interfering ions. Freedman and Hume (14) use absorption at 315 µ to determine ceric ion in sulfuric acid solution. They also describe a method of applying radioactive cerium as a tracer to correct for incoriiplete separation from other ions.…”

Precise Difference Method for the Spectrophotometric Determination of Cerium(IV) at Micromolar Concentrations

“…A procedure for the spectrophotometric determination of cerium (IV) was suggested by Sandell (4) in 1944. It was later developed by Freedman and Hume (1) and then, with modifications, by Medalia and Byrne (2). In this paper the procedure has been further developed and modified to give a highly reproducible and precise method for the spectrophotometric determination of cerium in the micromolar concentration range.…”