PRECISE DIFFERENCE METHOD FOR THE SPECTROPHOTOMETRIC DETERMINATION OF CERIUM(IV) AT MICROMOLAR CONCENTRATIONS

Journal Article · Wed Feb 01 04:00:00 EST 1961 · Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed.

DOI:https://doi.org/10.1021/ac60170a029· OSTI ID:4095472

Blatz, L A

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., Journal Name: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed. Vol. Vol: 33; ISSN ANCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BEER LAW
CATIONS
CERIUM
CHEMISTRY
COMPLEXES
INTERFERING ELEMENTS
ION EXCHANGE
IONS
IRON
NEODYMIUM
NITRATES
ORGANIC COMPOUNDS
PHOTOMETRY
QUANTITATIVE ANALYSIS
REDUCTION
RESINS
SPECTRA
SULFATES
THORIUM
URANIUM
ZIRCONIUM