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    Determination of Fe(II) and Fe(III) in water by flame atomic absorption spectrophotometry after their separation with Aspergillus niger immobilized on sepiolite
    (Japan Soc Analytical Chemistry, 2001) Bag, H.; Türker, A.R.; Tunceli, A.; Lale, M.
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    Diffusion and selective transport of alkali cations in a polysulfone ion exchange membrane
    (Gauthier-Villars, 1995) Ersöz, M.; Lale, M.; Atalay, T.
    he diffusion of alkali metals through a charged polysulfonated ICE-450 ion exchange membrane has been measured as a function of pH and conservation of the external solution at 25 degrees C. The permeability and diffusion coefficients were found to increase in the sequence Cs(+)greater than or equal to K+>Na+>Li+ and with the external concentration. This sequence can be explained by considering the hydration of the ions in the membrane. The modes of membrane/solution distribution and the diffusion of cations as a controlling factor in the membrane permselectivity and hydration values of cations both correlated consistently with the flux data, as well as with the estimated membrane permselectivity parameters. The selective transport of K/Na and K/Li binary systems at various pH gradients through the membrane was also investigated under various conditions. The selectivity depended on both the hydrated ionic size and the interaction between the fixed groups in the membrane and the metal ions. A good agreement was found between the observed diffusion coefficients and the selectivity values and the limiting mobility ratio in water.
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    Sorption behaviour of copper(II), zinc(II) and nickel(II) on formaldehyde cross-linked Saccharomyces cerevisiae immobilized on pumice stone
    (Inst Lebensmitteltechnologie Analytische Chemie, 2001) Lale, M.; Temocin, Z.; Bag, H.
    The adsorption of Cu, Zn and Ni on to formaldehyde cross-linked Saccharomyces cerevisiae immobilized on pumice stone was investigated. Maximum adsorption was occurred at pH 6 for all elements studied. The effect of mixing time and the initial concentration of metal ion on the adsorption of metal ions were also investigated. 1 mol l(-1) of HCl, KCl (pH 2) and NaCl (pH 2) solutions were tested for desorption and 1 mol l(-1) of KCl (pH 2) solution was found to be appropriate for the desorption of all metals studied. The desorption was 89.2% for Cu, 89.8% for Zn and 87.0 for Ni. The metal capacity of immobilized cell biomass (quantity of metals accumulatad by one gram biomass) was found as 2.09, 2.24 and 3.18 mg g(-1) dry cell biomass for Zn, Cu and Ni, respectively.