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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

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Abstract

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. p]Here the lithium TTA chelate in o-dichlorobenzene forms stable adducts with 12C4 (LiTTA·nl2C4, n=O—2); the stability constants (β) of the adducts determined by means of curve fitting method being βn = 4.46 and /βn=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.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Kanazawa University, Kanazawa, 920, Japan

    Tatsuo Itoh, Mokarram Billah, Takaharu Honjo & Kikuo Terada

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  1. Tatsuo Itoh
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  2. Mokarram Billah
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  3. Takaharu Honjo
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  4. Kikuo Terada
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Itoh, T., Billah, M., Honjo, T. et al. 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. ANAL. SCI. 7 (Suppl 1), 47–50 (1991). https://doi.org/10.2116/analsci.7.Supple_47

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  • DOI: https://doi.org/10.2116/analsci.7.Supple_47

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