Open AccessSeparation and Determination of a Trace Amount of Lithium as its Thenoyltrifluoroacetone Complex with 12-Crown-4 by Means of Synergic Extraction and Flame Photometry
Author(s) -
Taiki Itoh,
M. Billah,
Takaharu Honjo,
Kikuo Terada
Publication year - 1991
Publication title -
analytical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 73
eISSN - 1348-2246
pISSN - 0910-6340
DOI - 10.2116/analsci.7.supple_47
Subject(s) - thenoyltrifluoroacetone , chemistry , reagent , lithium (medication) , flame photometry , extraction (chemistry) , photometry (optics) , trace amounts , inorganic chemistry , stability constants of complexes , adduct , sodium , nuclear chemistry , analytical chemistry (journal) , chromatography , ion , solvent extraction , organic chemistry , medicine , stars , physics , astronomy , endocrinology , alternative medicine , pathology
A new method for the separation and determination of a trace amount of lithium in ppb∼ppm level in water as its thenoyltrifluoroacetone (TTA) complex with 12-crown-4 (12C4) has been established by means of synergic extraction and back extraction combined with flame photometry. The effect of various factors (pH, solvent, reagent concentration, shaking time, preconcentration factor, and foreign ions etc.) on the extraction and back extraction of lithium has been investigated. Here the lithium TTA chelate in o-dichlorobenzene forms stable adducts with 12C4 (LiTTA-n12C4, n=0∼2); the stability constants (β n) of the adducts determined by means of curve fitting method being βi=4.46 and β 2=6.45. The amount of lithium in sodium chloride of guaranteed reagent was found to be 9.5 -0.2 ppb by means of the proposed method. © 1991, The Japan Society for Analytical Chemistry. All rights reserved