A simple,rapid and sensitive method based on modified multiwalled carbon nanotube for preconcentration and determination of lead ions in aqueous media in natural pHs |
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| Authors: | Leila Torkian Mostafa M Amini Tayebeh Gorji Omid Sadeghi |
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| Institution: | 1. Applied Chemistry Department, Islamic Azad University, South Tehran Branch, 209, North Iran Shahr St., Tehran 11365/4435, Iran;2. Department of Chemistry, Shahid Beheshti University, G.C., Tehran 198396311, Iran;3. Department of Chemistry, Shahr-e-Rey Branch, Islamic Azad University, Tehran, Iran |
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| Abstract: | In this study, multiwalled carbon nanotube (MWCNT) was modified by the pyridine group using a silane agent and characterized by infrared spectroscopy (IR), thermal analysis (TG/DTA), and elemental analysis (CHN) and scanning electron microscopy (SEM). The application of this sorbent was investigated in determination of lead ions in aqueous samples, using flame atomic absorption spectrometry (FAAS). Through this study, different parameters such as pH and sample flow rate on adsorption process and eluent concentration, volume and flow rate were optimized. The limit of detection (LOD), the relative standard deviation and the recovery of the method were 2 ng mL?1, 1.3% and 99.7%, respectively. Two standard reference materials (NIST 1571 and NIST 1572) were used to verify accuracy of this method. Finally, the sorbent was successfully applied for extraction and determination of low levels of Pb(II) ions in aqueous samples. |
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| Keywords: | Corresponding author Tel : +98 21 29903109 fax: +98 21 2243166 Modified multiwalled carbon nanotube Pb(II) determination Solid-phase extraction Flame atomic absorption spectrometry |
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