SEPARATION AND DETERMINATION OF A TRACE AMOUNT OF LITHIUM AS ITS THENOYLTRIFLUOROACETONE COMPLEX WITH 12-CROWN-4 BY MEANS OF SYNERGIC EXTRACTION AND FLAME PHOTOMETRY

被引：16

作者：

Itoh, Tatsuo ^{[1
]}

Billah, Mokarram ^{[1
]}

Honjo, Takaharu ^{[1
]}

Terada, Kikuo ^{[1
]}

机构：

[1] Kanazawa Univ, Fac Sci, Dept Chem, Kanazawa, Ishikawa 920, Japan

来源：

ANALYTICAL SCIENCES | 1991年 / 7卷

关键词：

lithium; thenoyltrifluoroacetone; 12-crown-4; synergic extraction; flame photometry;

D O I：

10.2116/analsci.7.Supple_47

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new method for the separation and determination of a trace amount of lithium in ppb similar to 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 similar to 2); the stability constants (beta(n)) of the adducts determined by means of curve fitting method being beta(1)=4.46 and beta(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.

引用

页码：47 / 50

页数：4

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