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1

Interaction of metals with humic acid isolated from oxidized coal

100%
Erdogan S., Baysal A., Akba O., Hamamci C.
Polish Journal of Environmental Studies
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2007
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tom 16
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nr 5
671-675
The sorption behaviour of divalent cations M+ (Cu, Pb and Zn) and trivalent cations M3+ (Fe, Al) with humic acid isolated from oxidized coal (Hazro,SE Anatolia,Turkey) was followed in aqueous solution. Coal humic acid and metal ion interaction was investigated with special emphasis on the effects of pH, metal ion concentration and humic acid concentration. It has been found that the interaction of humic acid with metal ions in solution increases with pH, decreases with metal ion concentration and increases with humic acid concentration. The differences in sorption ability of particular metal ions on oxidized coal-derived humic acid are Fe> Pb> Cu> Al> Zn and Fe> Pb> Al> Cu> Zn at pH 2.5 and 3.5, respectively, while they are Fe=Pb=Cu=Al> Zn at both pH 4.5 and 5.5. The interaction of some trivalent (Fe, Al) and divalent(Cu, Pb, Zn) metal ions with humic acid prepared from coal was also studied using FTiR spectroscopy. This has proven helpful with respect to metal binding to understand better the potential sites of binding within the humic acid. Infrared spectroscopy showed the participation of cOOH and OH groups in binding to the metal ions.
2
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Comparative interpretation of lactate measurement by point of care spectrophotometric and ELISA methods in transition cows

100%
Erdogan H., Unubol Aypak S., Erdogan S., Ural K.
Polish Journal of Veterinary Sciences
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2018
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tom 21
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nr 4
3

Biosorption of Cd+2, Cu+2, and Ni+2 Ions by a thermophilic haloalkalitolerant bacterial strain (KG9) immobilized on Amberlite XAD-4

88%
Alkan H., Gul-Guven R., Guven K., Erdogan S., Dogru M.
Polish Journal of Environmental Studies
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2015
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tom 24
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nr 5
A newly isolated thermophilic haloalkalitolerant bacterial strain (KG9) as immobilized cells on a solid support was presented as a new biosorbent for the enrichment of Cd(II), Cu(II), and Ni(II) prior to flame atomic absorption spectrometric analysis. The KG9 strain was identified as a close member of Bacillus licheniformis following complete sequencing of 16S rRNA. The optimum conditions such as pH, amount of adsorbent, eluent type and volume, flow rate of sample solution, volume of sample solution, and matrix interference effect on the retention of the metal ions were evaluated for the quantitative recovery of the analytes. The analyte ions were quantitatively recovered and desorbed at pH range of 6.0-7.0 and 5 mL of 0.5 mol·L⁻¹ HCl. The loading capacities of adsorbents for Cd(II), Cu(II), and Ni(II) were found to be 22.7, 61.1, and 33.4 µmol·g⁻¹, respectively. The analytical detection limits for cadmium(II), copper(II), and nickel(II) were 0.42 µg·L⁻¹, 0.54 µg·L⁻¹, and 1.24 µg·L⁻¹. The proposed procedure was applied for the determination of metal ions in river water, drinking water, and mushrooms. The accuracy of the developed procedure was tested by analyzing NRCC-SLRS4 riverine water and SRM1570a spinach leaves as the certified reference materials.
4

Interpretation of 25-OH-D3, NEFA, and calcium correlations among cow and calf pairs

76%
Erdogan S., Ural K., Erdogan H., Ural D. A., Gultekin M., Pasa S.
Medycyna Weterynaryjna
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2021
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tom 77
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nr 04
5

Chemical characteristics of settled particles during a dust-storm

76%
Aydin F., Aydin I., Erdogan S., Akba O., Isik B., Hamamci C.
Polish Journal of Environmental Studies
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2012
|
tom 21
|
nr 3
Major synoptic systems bring desert dust from Arabia and the Sahara to Anatolia, Turkey. A study of particulate matter (PM) associated metal content such as As, Al, Cr, Cd, Co, Cu, Fe, Mn, Mo, Ni, Pb, Sb, Se, Sn, and Zn, etc., has been carried out for Diyarbakir, SE Anatolia, Turkey. Results show that the PM₁₀ levels during a dust storm were much higher than in a non-dust-storm period and that four metals (Fe, Al, Cr, Mn) were dominant in settled particles. This research does not only provide background data for air quality management, but also provides valuable information about the chemical composition of the particles.
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