Solid phase extraction of trace amounts of silver (I) using dithizone-immobilized alumina-coated magnetite nanoparticles prior to determination by flame atomic absorption spectrometry |
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Authors: | Mohammad Ali Karimi Abdolhamid Hatefi-Mehrjardi Sayed Zia Mohammadi Alireza Mohadesi Mohammad Mazloum-Ardakani Asghar Askarpour Kabir |
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Institution: | 1. Department of Chemistry , Payame Noor University , P.O. Box 19395-4697, Tehran , Iran;2. Department of Chemistry &3. Nanoscience and Nanotechnology Research Laboratory (NNRL) , Payame Noor University (PNU) , Sirjan , Iran ma.karimi43@gmail.com;5. Nanoscience and Nanotechnology Research Laboratory (NNRL) , Payame Noor University (PNU) , Sirjan , Iran;6. Department of Chemistry , Payame Noor University (PNU) , Kerman , Iran;7. Department of Chemistry, Faculty of Sciences , Yazd University , Yazd , Iran;8. Department of Chemistry & |
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Abstract: | A new, simple, fast and reliable solid-phase extraction (SPE) method has been developed to separation/preconcentration of trace amounts of silver ion from environmental water samples using dithizone/sodium dodecyl sulfate immobilized on alumina-coated magnetite nanoparticles (DTZ/SDS-ACMNPs) and its determination by flame atomic absorption spectrometry. The coating of alumina on Fe3O4 NPs not only avoids the dissolving of Fe3O4 NPs in acidic solution, but also extends their application without sacrificing their unique magnetization characteristics. This method avoided the time-consuming column-passing process of loading large volume samples in traditional SPE through the rapid isolation of DTZ/SDS-ACMNPs with an adscititious magnet. Optimal experimental conditions including amount of DTZ/SDS, pH value, standing time, sample volume, type, volume and concentration of eluent and co-existing ions have been studied and established. Under the optimal experimental conditions, the detection limit for Ag(I) with enrichment factors of 100 was found to be 0.52?ng?mL?1 and its relative standard deviations (RSD) was 3.4% (n?=?10, C?=?5.0?µg?mL?1). The linear range of calibration curve for Ag(I) was 2–5000?ng?mL?1 with a correlation coefficient of 0.9991. The proposed method was successfully applied to the determination of target analyte in different water and wastewater samples. The validity of the method has been checked by applying it to study the recovery of silver ion in spiked water and wastewater samples. |
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Keywords: | solid-phase extraction alumina-coated magnetite nanoparticles silver(I) flame atomic absorption spectrometry |
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