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    Adsorption of Fe, Mn, Cu and Cr on montmorillonite modified with tributyl phosphate
    (Parlar Scientific Publications (P S P), 2007) Aktas, Yildiz Kalebasi
    A simple preconcentration method is described for the determination of Fe, Mn, Cu and Cr in water samples by flame atomic absorption spectrometry. Montmorillonite by the addition of tributyl phosphate was used as adsorbent for column studies. The influences of aqueous solution pH, amount of montmorillonite, as well as flow-rates of adsorption and elution of sample solutions were studied. The present method was found to be applicable to preconcentrate Fe, Mn, Cu and Cr in natural water samples with good results (R.S.D. 3-8%, N=10). The detection limits for Fe, Mn, Cu and Cr were found to be 0.09, 0.23, 0.16 and 0.19 mu g/l; respectively. The adsorption capacities for Fe, Mn, Cu and Cr were calculated to be 14.5, 10.4, 16.0 and 13.6 mg/g, respectively.
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    Determination of Cd, Mn, Sb, Ni and Fe in water samples after preconcentration on bentonite modified with trioctyl phosphine oxide
    (Parlar Scientific Publications (P S P), 2007) Aktas, Yildiz Kalebasi; Ibar, Hilmi
    Bentonite modified by the addition of trioctyl phosphine oxide (TO-B) is developed for the separation and preconcentration of Cd, Mn, Sb, Ni and Fe, prior to their determination by flame atomic absorption spectrometry (FAAS). Separation and preconcentration of the above metals have been investigated by a column method using, TO-B as adsorbent, and analytes were quantitatively retained at pH 6.0. The elements collected were completely recovered with 1 mol/L of nitric acid. Low blank values of the collector have served as important advantage, and recoveries were 98.3%, 98.6%, 100%, 98.1% and 100% for Cd, Mn, Sb, Ni and Fe, respectively. The relative standard deviations were found to be 1.0-4.0%. Detection limits (3 sigma) were 0.25 mu g L-1 for Cd, 0.19 mu g L-1 for Mn, 2.3 mu g L-1 for Sb, 0.17 mu g L-1 for Ni and 0.12 mu g L-1 for Fe. The method was practically applied analysing the studied elements in wastewaters. The method can be characterized with fastness, simplicity, quantitative recovery, and high reproducibility.
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    Extraction of iron(III), antimony(III) and cadmium(II) from hydrochloric acid by trioctyl amine and trioctyl phosphine oxide in isoamyl acetate
    (Parlar Scientific Publications (P S P), 2007) Aktas, Yildiz Kalebasi; Ibar, Hilmi
    The extraction of iron (III), antimony (III) and cadmium (II) from hydrochloric acid solutions has been investigated using high-molecular weight amine (trioctyl amine, TOA, R3N) and a neutral organophosphorus compound (trioctyl phosphine oxide, TOPO) in isoamyl acetate (IAA). It was found that the efficiency of batch extraction method for the studied elements is almost similar for trioctyl phosphine oxide and trioctyl amine, both at low and higher acidity. This method was applied to the analysis of the elements in wastewaters. In addition, the back-extractions for iron, antimony and cadmium were studied. The interfering effects of sodium, potassium, magnesium, calcium, lead and cobalt were investigated. Blank values were low and recoveries were 100%, 100% and 88.3% for iron, antimony and cadmium, respectively, at 95% confidence level. The relative standard deviations for the determinations were found to be 1.0-6.0%. Detection limits (3 sigma) were 0.5 mu g L-1 for iron, 0.6 mu g L-1 for antimony and 2.9 mu g L-1 for cadmium.
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    Heavy Metal Content of Roadside Soil in Edirne, Turkey
    (Taylor & Francis Inc, 2010) Aktas, Yildiz Kalebasi; Kocabas, Arikan
    In this study, conducted between July 2006 and April 2007, trace metal concentrations of the roadside soil samples of Edirne urban area were investigated to determine Pb, Cu, Ni, and Zn content by Graphite-Atomic Absorption Spectrometer (GAAS) and Inductively Coupled Plasma Emission Spectroscopy (ICP-OES). Roadside soil samples were collected from 8 sites (384 soil samples). Soil samples were collected at distances 1, 5, and 10 meters from the roadside and taken at depths of 0-10 and 10-30cm from surfaces at every distance. The mean Pb, Cu, Ni, and Zn contents in the urban soil samples from Edirne (0.885-12.38, 6.64-25.81, 53.31-272.1, and 161.5-485.6mg/kg, respectively) were compared with mean concentrations for other cities around world. The results revealed higher concentrations of heavy metals in topsoil samples than in sub-surface samples. The relative standard deviations for Pb, Cu, Ni, and Zn were found to be 0.1-0.73%, 0.13-0.61%, 0.07-0.3%, and 0.05-0.24%, respectively.