Abstract
We report on a method for selective extraction and backextraction for the ultra-sensitive determination of Pd(II). Magnetite nanoparticles modified with sodium dodecyl sulfate were used to extract Pd(II) as its green 1-(2-pyridylazo)-2-naphtholate complex prior to zero- and first-derivative spectrophotometric determination at 659 and 681 nm, respectively. A sample volume of 70 mL was backextracted with 0.50 mL of n-butanol in a 3-phasic system. The effects of reaction time and the other variables were optimized. The enrichment factor is 134 and the calibration plots are linear in the range from 2 to 90 ng mL-1 of Pd(II). The detection limit is 0.3 ng mL-1 and the relative standard deviations and recoveries at levels of 10 and 72 ng mL-1 of Pd(II) are in the range from 1.1–4.9%, and from 98.5–102.6%, respectively. Most ions do not significantly interfere. The method was successfully applied to the determination of Pd(II) in water and urine samples, alloys, and palladium catalysts.
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The new SPE method was developed for the preconcentration-spectrophotometric determination of palladium using dodecyl sulfate coated magnetite nanoparticles as adsorbrnt and then backextraction by a low volume of n-butanol in a novel 3-phasic backextraction. The established SPE method proved to be efficient for palladium determination and provided satisfactory recoveries and precisions.
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The authors wish to thank the Research Council of the University of Mohaghegh Ardabili for the financial support of this study.
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Sensitive and selective spectrophotometric determination of palladium(II) ion following its preconcentration using modified magnetite nanoparticles and 3-phasic backextraction (DOC 164 kb)
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Eskandari, H., Khoshandam, M. Sensitive and selective spectrophotometric determination of palladium(II) ion following its preconcentration using modified magnetite nanoparticles and 3-phasic backextraction. Microchim Acta 175, 291–299 (2011). https://doi.org/10.1007/s00604-011-0674-4
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DOI: https://doi.org/10.1007/s00604-011-0674-4