Preconcentration of trace elements from water samples on a minicolumn of yeast (Yamadazyma spartinae) immobilized TiO₂ nanoparticles for determination by ICP-AES
2011
Baytak, Sıtkı | Zereen, Fahmida | Arslan, Zikri
A trace element preconcentration procedure is described utilizing a minicolumn of yeast (Yamadazyma spartinae) immobilized TiO₂ nanoparticles for determination of Cr, Cu, Fe, Mn, Ni and Zn from water samples by inductively coupled plasma atomic emission spectrometry. The elements were quantitatively retained on the column between pH 6 and 8. Elution was made with 5% (v/v) HNO₃ solution. Recoveries ranged from 98±2 (Cr) to 100±4 (Zn) for preconcentration of 50mL multielement solution (50μgL⁻¹). The column made up of 100mg sorbent (yeast immobilized TiO₂ NP) offers a capacity to preconcentrate up to 500mL of sample solution to achieve an enrichment factor of 250 with 2mL of 5% (v/v) HNO₃ eluent. The detection limits obtained from preconcentration of 50mL blank solutions (5%, v/v, HNO₃, n=11) were 0.17, 0.45, 0.25, 0.15, 0.33 and 0.10μgL⁻¹ for Cr, Cu, Fe, Mn, Ni and Zn, respectively. Relative standard deviation (RSD) for five replicate analyses was better than 5%. The retention of the elements was not affected from up to 500μgL⁻¹ Na⁺ and K⁺ (as chlorides), 100μgL⁻¹ Ca²⁺ (as nitrate) and 50μgL⁻¹ Mg²⁺ (as sulfate). The method was validated by analysis of freshwater standard reference material (SRM 1643e) and applied to the determination of the elements from tap water and lake water samples.
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