PHOTOMETRIC TITRATION OF THORIUM AND THE RARE EARTHS WITH (ETHYLENEDINITRILO) TETRAACETIC ACID

Journal Article · Sat Aug 01 04:00:00 EDT 1959 · Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed.

DOI:https://doi.org/10.1021/ac60152a032· OSTI ID:4269312

Bril, K Y; Holzer, S; Rethy, B

Thorium and the rare earths are titrated with (ethylenedinitrilo)tetraacetic acid using Alizarin Red S is indicator. Photometric end point detection increases the sensitivity of the method. Determinations can be made at concentrations as low as 5.10-6M. In the case of the cerium group rare earths, the method allows simultaneous determination of both thorium and the rare earths. As little as 0.1% of thorium in the rare earths, or 0.2% of the rare earths in thorium, can be evaluated. The interference of cerium is eliminated by the addition of hydroxylamine hydrochloride. The method is applied to naturally occurring mixtures, after some conventional separations. (auth)

• Research Organization: Research Lab., Orquima S.A., Sao Paulo, Brazil
• Sponsoring Organization: USDOE
• NSA Number: NSA-13-016809
• OSTI ID: 4269312
• 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: 31; ISSN ANCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALIZARIN
AMINES
CERIUM
CHEMICAL REACTIONS
CHEMISTRY
DYES
EDTA
HYDROCHLORIC ACID
HYDROXIDES
HYDROXYLAMINE
NITROGEN COMPOUNDS
PHOTOMETRY
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
RARE EARTHS
SEPARATION PROCESSES
THORIUM
TRACE AMOUNTS