PRECISE DIFFERENCE METHOD FOR THE SPECTROPHOTOMETRIC DETERMINATION OF CERIUM(IV) AT MICROMOLAR CONCENTRATIONS
In a cation resin exchange study of the sulfate ion complexes of cerous ion, a precise analytical spectrophotometric method for determination of cerium in the range of 5 to 12 x 10/sup -6/M was necessary. Existing methods were modified by introduction of a difference method involving reduction of cerium(IV) to cerium(III) and studies were made of the factors influencing precision, such as suspended material, presence of organic (reducing) material, purification of reagents and solutions, cell constants, stray light of the spectrophotometer, interfering substances, optimum concentrations of all reagents, time factors, and blank corrections. The molar absorptivities at 320,340, and 360 m were 5.92 x 10/ sup 3/, 5.12 x 10/sup 3/, and 3.52 x 10/sup 3/. Reproducibility checks revealed a probable error of a single determination of about 0.25% at each wavelength. Iron, thorium, uranium, neodymium, zirconium, nitrate ion, and excess persulfate ion did not interfere. 0ther possible interferences are discussed. Beer's law is obeyed within the limits of the precision obtained. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-008693
- OSTI ID:
- 4095472
- Journal Information:
- Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed., Vol. Vol: 33; Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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