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    DETERMINATION OF VANADIUM IN TURKISH ASPHALTITES
    (Estonian Academy Publishers, 2010) Aydin, I.; Aydin, F.; Kilinc, E.; Hamamci, C.
    Vanadium is found in many rocks and minerals, including asphaltite. Asphaltite is one of the naturally occurring black, solid bitumens, which are soluble at heating in carbon disulfide and fuse. Asphaltite is also a solidified hydrocarbon compound derived from petroleum. Determination of vanadium in asphaltite ash was performed by microwave-acid digestion followed by inductively coupled plasma-optical emission spectrometry (ICP-OES) and flame atomic absorption spectrometry (FAAS). Asphaltites from Avgamasya, Harbul, and Seguruk deposits in SE Anatolia of Turkey have been investigated. Concentrations of vanadium in Avgamasya, Harbul, Seguruk asphaltite bottom ashes were determined using ICP-OES to be 5.871, 4.324, 2.777 g kg(-1), respectively.
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    Extraction of Cu2+ and Co2+ by using Tricholoma populinum loaded onto Amberlite XAD-4
    (Springer, 2021) Ozdemir, S.; Kilinc, E.; Poli, A.; Romano, I; Nicolaus, B.; Mustafov, S. D.; Sen, F.
    In this work, an alternative preconcentration process suggested based on usingTricholoma populinumas a fungal biosorbent for the sensitive preconcentration of Cu(2+)and Co2+. Amberlite XAD-4 was utilized for the loading of the biomass in solid-phase extraction (SPE) procedure. It was found thatT.populinumloaded with XAD-4 resin was a selective biosorbent for the preconcentration of Cu(2+)and Co2+. Experimental variables in SPE procedure such as pH, the flow rate of the sample, type and concentration of eluent, amount ofT.populinumand of XAD-4 resin, sample volume, and potential interfering ion effect were studied. Surface functionalities of the metal-loaded and metal-unloaded biosorbent were determined by comparing Fourier transform infrared spectroscopy spectra and scanning electron microscopy images. Limit of detection values for Cu(2+)and Co(2+)were found as 0.034 and 0.019 ng mL(-1), respectively. The linear range was found as 0.2-15 ng mL(-1)for both analytes. Relative standard deviation values were found as lower than 3.0%. Certified reference materials were applied for process validation, and also, the concentrations of Co(2+)and Cu(2+)were investigated in real water, vegetable, and soil samples. So, the method developed could be utilized for the preconcentrations of Cu(2+)and Co(2+)for routine analysis. This method can be used as an inexpensive and accessible alternative to GF-AAS or ICP-MS methods.
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    Öğe
    Heavy metal bioaccumulation by thermophilic Bacillus thermoantarcticus and Anoxybacillus amylolyticus
    (Wiley-Blackwell Publishing, Inc, 2009) Ozdemir, S.; Guven, K.; Kilinc, E.; Demirci, O.; Nicolaus, B.
    [Abstract Not Available]
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    Öğe
    Stability-indicating high performance thin layer chromatographic determination of sulfanilamide in human urine
    (Maik Nauka/Interperiodica/Springer, 2009) Kilinc, E.; Gumgum, B.; Hamamci, C.; Aydin, F.
    A simple, sensitive, selective, precise and stability-indicating high-performance thin-layer chromatographic (HPTLC) method was developed and applied to human urine for the densitometric determination of sulfanilamide. A mixture of chloroform-ethyl acetate-xylene (2.5: 4.0: 1.0, v/v/v) was used as a mobile phase. The system was found to give compact spots for sulfanilamide (retardation factor, R (f) = 0.21 +/- 0.02). The linear regression analysis data for the calibration plots showed good linear relationship with r (2) = 0.9970 +/- 0.0003 and r (2) = 0.9947 +/- 0.020 within the concentration range of 50-250 ng per spot and 100-1000 ng per spot with respect to peak area, respectively. The limit of detection (LOD) and quantification (LOQ) were 8 and 25 ng per spot, respectively. Sulfanilamide was subjected to acid and alkali hydrolysis, oxidation, dry heat and wet heat treatment. According to the International Conference on Harmonization (ICH) guidelines the method was validated for precision, recovery and robustness. The ultraviolet (UV) spectra of the degradation products which had different spectra from sulfanilamide were also recorded.