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Interaction of metals with humic acid isolated from oxidized coal

100%

Erdogan S. , Baysal A. , Akba O. , Hamamci C.

2007

tom 16

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.

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

2018

tom 21

nr 4

Chemical characteristics of settled particles during a dust-storm

75%

Aydin F. , Aydin I. , Erdogan S. , Akba O. , Isik B. , Hamamci C.

Polish Journal of Environmental Studies

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.

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

75%

Erdogan S. , Ural K. , Erdogan H. , Ural D. A. , Gultekin M. , Pasa S.

Medycyna Weterynaryjna

2021

tom 77

nr 04