Summary
Transport extraction based on solvent sublation has been used for a 400-fold preconcentration of iodide from aqueous samples into an immiscible organic solvent. Separation efficiencies amounting up to 95% were obtained for iodide concentrations of 1–10 mg/l, independent of the volume of the aqueous samples in the range of 1–4 l. Iodide was oxidized to iodine, which was subsequently transport-extracted as an ionic associate with the cationic surface-active agent N-cetylpyridinium chloride into 10 ml of benzene. The effect of various parameters (concentration of iodide, bubbling time, N2-gas flow-rate, volume of the aqueous phase) on transport extraction was investigated. Kinetic investigations showed that the transport-extraction process essentially follows a modified Langmuir adsorption model, which makes it possible to calculate the mass-transfer rate constant of the process for each particular case.
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On leave from the Institute of Radioecology and Applied Nuclear Techniques, CS-04061 Košice, Czechoslovakia
Present address: Department of Inorganic Chemistry, P. J. Šafárik University, Moyzesova 11, CS-04154 Košice, Czechoslovakia
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Palágyi, S., Braun, T. Transport extraction for trace element separation and preconcentration. Fresenius J Anal Chem 346, 905–908 (1993). https://doi.org/10.1007/BF00322748
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DOI: https://doi.org/10.1007/BF00322748