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  • Küçük Resim
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    Anoxybacillus sp. SO B1 immobilized Amberlite XAD-16 for solid phase preconcentration of Cu(II), Pb(II) and their determinations by flame atomic absorption spectrometry
    (Bioremediation Journal, 2016) Varhan, Elif; Özdemir, Sadin; Dolak, İbrahim; Okumuş, Veysi; Dündar, Abdurrahman; Ziyadanoğulları, Berrin; Aksoy, Zehra; Onat, Ruken
    A new method for the determination of Cu(II) and Pb(II) by flame atomic absorption spectrometry (FAAS) after preconcentrating on a column containing Anoxybacillus sp. SO B1–immobilized Amberlite XAD-16 was developed. The functional groups of Anoxybacillus sp. SO B1 immobilized on Amberlite XAD-16 were characterized in KBr tablets by Fourier transform infrared (FT-IR) spectrometry. Various parameters such as pH, amount of the adsorbent, eluent type and volume, and flow rate of the sample solution were studied. The optimum pH values of quantitative sorption for Cu(II) and Pb(II) were found to be pH 7.0 and 5.0 and Cu(II) and Pb(II) ions could be quantitatively eluted with 5.0 ml of 1.0 mol L¡1 HCI and 10.0 ml of 0.25 mol L¡1 HNO3, respectively. Recoveries of Cu(II) and Pb(II) were found to be 100.9 § 1.57% and 100.3 § 0.49% (N D 5), the limits of detection of Cu(II) and Pb(II) in the determination by FAAS (3 s, N D 10) were found to be 0.8 and 1.6 mg L¡1, respectively. The proposed enrichment method was applied for metal ion determination from water samples such as two parts of Tigris River water in Diyarbakır and Elazı_g, Lake of Hazar in Elazı_g, and tap water in Diyarbakır. Furthermore, the accuracy of the proposed method was verified by studying the analytical recovery and by analyzing certified reference material (NCS-DC 73350 leaves of poplar).
  • Küçük Resim
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    Simultaneous removal of indomethacine, papaverine and allopurinol from aqueous solution by using submerged aquatic plant nasturtium officinale
    (Asian Journal of Chemistry, 2010) Okumuş, Veysi; Varhan, Elif; Başaran, Davut; Onay, Ahmet
    Simultaneous removal of indomethacine, papaverine and allopurinol from aqueous solution by using submerged aquatic plant Nasturtium officinale biomass in high performance thin layer chromatography (HPTLC) was studied. Optimum biosorption conditions were determined as a function of contact time, pH, removal capacity of the amount of biomass and initial dry concentration. Experiments were performed in batch conditions. Concentrations of the drugs in the remaining solutions were simultaneously analyzed by HPTLC. Langmuir and Freundlich models were applied to describe the biosorption isotherm of the drugs by aquatic plant Nasturtium officinale biomass. According to the results, optimum parameters were found as 2.0 g biomass, pH:5.0 and 60 min contact time. Obtained from plots of Langmuir and Freundlich adsorption models, the highest drug uptakes were calculated from Langmuir isotherm and found to be 43.10, 39.68 and 38.61 mg/g for indomethacine, papaverine and allopurinol, respectively.