Supramolecular microextraction of cobalt from water samples before its microsampling flame atomic absorption spectrometric detection |
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Authors: | Zeid A Alothman Mohamed A Habila Erkan Yilmaz Nasser M Al-Harbi |
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Institution: | 1. Advanced Materials Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia;2. Faculty of Sciences, Department of Chemistry, Erciyes University, Kayseri, 38039, Turkey;3. Regional Analytical SABIC T&4. I, Saudi Basic Industries Corporation, Riyadh, 11551, Kingdom of Saudi Arabia |
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Abstract: | The supramolecular solvent system consists of tetrahydrofuran (THF) and 1-decanol, that was used as an extraction solvent for a microextraction procedure for the preconcentration and separation of Co(II). The proposed supramolecular-based procedure was combined with microsampling flame atomic absorption spectrometry for the determination of cobalt at trace levels in water samples. N-Benzoyl-N,N-diisobutylthiourea was used to chelate Co(II) in an aqueous solution. Quantitative extraction efficiency was obtained at pH 6.5. The effects of analytical parameters including pH, amount of ligand, type, ratio and volume of supramolecular solvent, sample volume and interfering ions were investigated for optimisation of the procedure. The proposed supramolecular solvent-based microextraction procedure (Ss-ME) exhibits a limit of detection (LOD) of 1.29 µg L?1 and a limit of quantification (LOQ) of 3.88 µg L?1. The procedure was validated by addition/recovery tests and by applying TMDA 64.2 and TMDA 53.3 water certified reference materials. The microextraction method was successfully applied for the preconcentration and determination of cobalt in water samples. |
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Keywords: | Supramolecular solvent microextraction cobalt N-Benzoyl-N N-diisobutylthiourea microsampling flame atomic absorption spectrometry water samples |
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