Extraction and Flame Spectrophotometric Determination of Lanthanum
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 a...
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Veröffentlicht in: | Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed Anal. Ed, 1959-02, Vol.31 (2), p.187-191 |
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Sprache: | eng |
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Zusammenfassung: | 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) |
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ISSN: | 0003-2700 1520-6882 |
DOI: | 10.1021/ac60146a007 |