caa a22 4500 445879726 CHVBK 20180317145538.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s00604-010-0478-y doi (NATIONALLICENCE)springer-10.1007/s00604-010-0478-y Flame atomic absorption spectrometric determination of trace amounts of Pb(II) and Cr(III) in biological, food and environmental samples after preconcentration by modified nano-alumina [Elektronische Daten] [Abbas Afkhami, Mohammad Saber-Tehrani, Hasan Bagheri, Tayyebeh Madrakian] A new solid-phase extraction sorbent was used for the preconcentration of Pb(II) and Cr(III) ions prior to their determination by flame atomic absorption spectrometry. It was prepared by immobilization of 2,4-dinitrophenylhydrazine on nano-alumina coated with sodium dodecyl sulfate. The sorbent was characterized by scanning electron microscopy, N2 adsorption and Fourier transform infrared spectrometry, and used for preconcentration and separation of Pb(II) and Cr(III) from aqueous solutions. The ions on the sorbent were eluted with a mixture of nitric acid and methanol. The effects of sample pH, flow rates of samples and eluent, type of eluent, breakthrough volume and potentially interfering ions were studied. Linearity is maintained between 1.2 and 350μg L-1 of Pb(II), and between 2.4 and 520μg L-1 of Cr(III) for an 800-mL sample. The detection limit (3s, N = 10) for Pb(II) and Cr(III) ions is 0.43 and 0.55μg L-1, respectively, and the maximum preconcentration factor is 267. The method was successfully applied to the evaluation of these trace and toxic metals in various water, food, industrial effluent and urine samples. Figure Recovery percentage of Pb(II) and Cr(III) ions at different solution volumes. Springer-Verlag, 2010 Preconcentration nationallicence Modified γ-alumina nanoparticles nationallicence Lead (II) nationallicence Chromium (III) nationallicence Atomic absorption spectrometric determination nationallicence Afkhami Abbas Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran aut Saber-Tehrani Mohammad Department of Chemistry, Islamic Azad University, Science and Research Branch, P. O. Box1415-775, Tehran, Iran aut Bagheri Hasan Department of Chemistry, Islamic Azad University, Science and Research Branch, P. O. Box1415-775, Tehran, Iran aut Madrakian Tayyebeh Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran aut Microchimica Acta Springer Vienna 172/1-2(2011-02-01), 125-136 0026-3672 172:1-2<125 2011 172 604 https://doi.org/10.1007/s00604-010-0478-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00604-010-0478-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Afkhami Abbas Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran aut NATIONALLICENCE 700 1- Saber-Tehrani Mohammad Department of Chemistry, Islamic Azad University, Science and Research Branch, P. O. Box1415-775, Tehran, Iran aut NATIONALLICENCE 700 1- Bagheri Hasan Department of Chemistry, Islamic Azad University, Science and Research Branch, P. O. Box1415-775, Tehran, Iran aut NATIONALLICENCE 700 1- Madrakian Tayyebeh Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran aut NATIONALLICENCE 773 0- Microchimica Acta Springer Vienna 172/1-2(2011-02-01), 125-136 0026-3672 172:1-2<125 2011 172 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer