Abstract
A simple and sensitive cloud point extraction method for the preconcentration of thorium(IV) prior to spectrophotometric determination was developed. The method was based on the formation of complex of thorium(IV) with quinalizarin at pH 5.0 and mixed micelle-mediated extraction of the complex using cethyltrimethyl ammonium bromide and Triton X-114. The enriched analyte in the surfactant-rich phase was determined spectrophotometrically at 600 nm. The effect of optimal extraction and reaction conditions was studied. Under the optimum conditions, linearity was obeyed over the range of 5.0–100 ng mL−1 and the limit of detection was 1.40 ng mL−1. The proposed method was validated and successfully applied for the determination of thorium(IV) in certified reference materials and real samples with satisfactory results.
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El-Hay, S.S.A., Gouda, A.A. Determination of thorium(IV) in real samples by spectrophotometry after micelle-mediated cloud point extraction. J Radioanal Nucl Chem 310, 191–200 (2016). https://doi.org/10.1007/s10967-016-4780-y
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DOI: https://doi.org/10.1007/s10967-016-4780-y