EXTRACTION AND FLAME SPECTROPHOTOMETRIC DETERMINATION OF LANTHANUM

Journal Article · Sun Feb 01 04:00:00 EST 1959 · Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed.

DOI:https://doi.org/10.1021/ac60146a007· OSTI ID:4293920

Menis, O; Rains, T C; Dean, J A

Microgram quaatities of lanthanum are selectively extracted by a O.1M solution of 2-thenoyltrifluoroacetone in 4-methyl-2-pentanone from a 1M acetate solution buffered at pH 5; lanthanum is then determined by a flame photometer. Of 18 elements tested, only titanium and aluminum interfere when they are present in greater amounts than the lanthanum; fluoride and phosphate interfere by preventing the extraction of lanthanum. When thorium, uranium, copper, and iron are major components of the sample, they are extracted with 2- thenoyltrifluoroacetone at pH 1.5 before extraction of lanthaum. The lanthaum emission emanates from a series of oxide bands; those at 442, 560, and 743 m mu were investigated. The band at 743 m mu is the most suitable for the determination of lanthanum in the presence of interfering elements and when a redsensitive photomultiplier tube is incorporated in the flame photometer. The emission intensity of lanthanum from the ketone solution is 100-fold greater than the emissivity from aqueous solutions. The sensitivity is 0.05 gamma of lanthanum per ml per scale division (% T). (auth)

• Research Organization: Oak Ridge National Lab., Tenn.; Univ. of Tennessee, Knoxville
• Sponsoring Organization: USDOE
• NSA Number: NSA-13-008670
• OSTI ID: 4293920
• 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

ACETATES
ACETONE
ACIDITY
ALUMINUM
CHEMISTRY
COPPER
ERRORS
FLUORIDES
FREQUENCY
IRON
KETONES
LANTHANUM
METHYL RADICALS
ORGANIC FLUORINE COMPOUNDS
OXIDES
PHOSPHATES
PHOTOMETRY
PHOTOMULTIPLIERS
QUANTITATIVE ANALYSIS
SOLUTIONS
SOLVENT EXTRACTION
SPECTROSCOPY
THORIUM
TITANIUM
TRACE AMOUNTS
URANIUM