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    DETERMINATION OF SOME RARE ELEMENTS IN PHOSPHATE ROCKS BY INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION-SPECTROMETRY
    (Marcel Dekker Inc, 1991) GUMGUM, B; HAMAMCI, C
    Eight elements(Cu, Co, La, Nd, Pr, V, Y and Zn) were determined in acid digests of the phosphate rocks using inductively coupled plasma atomic emission spectrometry(ICP-AES). The abondance of these elements exhibits the typical distribution pattern reported in geological samples from Turkey. The analytical method described in this paper is suitable for the determination of rare elements in phosphate rocks even if the element concentrations are very low in samples. While HCl+HNO3 acidic rock dissolutions are incomplete with respect to some rock forming minerals the used HF+HNO3 attack dissolves these minerals completely.
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    THE EFFECT OF DIFFERENT MINERAL ACIDS ON EMISSION INTENSITY IN ICP SPECTROCHEMISTRY
    (Pergamon-Elsevier Science Ltd, 1993) GUMGUM, B; HAMAMCI, C
    HNO3, HCl, H2SO4, HClO4, and H3PO4 were investigated for their effects on the emission intensities of some transition and rare earth elements. The mixture solutions of Co, Cu, La, Mo, V, Y, and Zn were prepared with these acids and determined by ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). The acids of HNO3, HCl, and HClO4 have showed similar effect on the emission intensities. The extent of signal suppressions were large in H2SO4 compared with the other acids. The relative standard deviations range from 0.03 to 5.40%. Recoveries of Co, Cu, La, Mo, Y, V, and Zn were in the range of 97.0-105.1%, 93.0-101.2%, 95.5-110.3%, 76.2-96.8%, and 96.8-134.5% for HNO3, HCl, HClO4, H2SO4, and H3PO4 respectively.
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    EFFECT OF ROASTING WITH AMMONIUM-SULFATE AND SULFURIC-ACID ON THE EXTRACTION OF COPPER AND COBALT FROM COPPER CONVERTER SLAG
    (Marcel Dekker Inc, 1991) HAMAMCI, C; ZIYADANOGULLARI, B
    Copper converter slag, provided by Ergani Copper Co. of Etibank and containing 2.56% copper and 0.22% cobalt, was roasted with ammonium sulfate. The effects of such parameters as temperature (200-600-degrees-C), duration of roasting (15-120 min), and amount of ammonium sulfate (0.5-2.5 times stoichiometric) have been studied. Under optimum conditions (slag size, -100 mesh; stoichiometric requirement of ammonium sulfate; roasting temperature of 400-degrees-C for 60 min), we obtained 88% Cu and 67% Co by extraction. Similar studies were carried out with concentrated sulfuric acid. The influence of experimental variables such as roasting temperature (25-300-degrees-C), roasting period (30-120 min), and amount of sulfuric acid (0.5-2 times stoichiometric) has been studied. Under atmospheric conditions, i.e., at 200-degrees-C and a roasting period of 60 min with 1.5 times the stoichiometric amount of sulfuric acid, recoveries of copper and cobalt were 82 and 96%, respectively.
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    Öğe
    NMR WATER PROTON T1 MECHANISM IN BLOOD DILUTED BY ITS OWN PLASMA
    (Marcel Dekker Inc, 1990) YILMAZ, A; HAMAMCI, C
    [Abstract Not Available]