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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed Anal. Ed, 1959-02, Vol.31 (2), p.187-191
Hauptverfasser: Menis, Oscar, Rains, T. C, Dean, J. A
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
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)
ISSN:0003-2700
1520-6882
DOI:10.1021/ac60146a007