RARE EARTH CHROMATOGRAPHY USING BIS-(2-ETHYLHEXYL) ORTHOPHOSPHORIC ACID

Journal Article · Mon Apr 01 04:00:00 EST 1963 · J. Chromatog.

DOI:https://doi.org/10.1016/S0021-9673(01)92343-X· OSTI ID:4685917

Winchester, J W

Sharp separations of microgram amounts of the lanthanide elements as trivalent ions in aqueous hydrochloric acid solution are made chromatographically using a column of diatomaceous silica made hydrophobic with dchlorodimethylsilane vapors and coated with high purity bis-(2ethylhexyl) orthophosphoric acid (DEP). Separation factors averaging 2.6 for adjacent rare earths are observed, as in solvent extraction using DEP, such that the higher atomic number elements are more tightiy held by the column. The kinetics of the sorption-desorption process appear to be very fast, but elutions at 70 deg appear to be somewhat sharper than at 25 deg , especially at high flow rates and high loading. A heated column 5 cm long and 2 cm/sup 3/ total volume (70% void space) has been used to separate 15 micrograms of mixed lanthanides from each other in 3 hr using a stepwise gradient from 0.14 to 3.8N HCl. La is eluted first, and Y is eluted together with Er. (auth)

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• NSA Number: NSA-17-029031
• OSTI ID: 4685917
• Journal Information: J. Chromatog., Journal Name: J. Chromatog. Vol. Vol: 10
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ADSORPTION
ALKYL RADICALS
CHEMISTRY
CHROMATOGRAPHY
DEHPA
ETHYL RADICALS
HEXYL RADICALS
HYDROCHLORIC ACID
LEACHING
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHORIC ACID
RARE EARTHS
REACTION KINETICS
SEPARATION PROCESSES
SILICON OXIDES
SOLUTIONS
SOLVENT EXTRACTION
TRACE AMOUNTS
WATER