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    CONCENTRATIONS OF COPPER AND ZINC IN FISH AND SEDIMENTS FROM THE TIGRIS RIVER IN TURKEY
    (Pergamon-Elsevier Science Ltd, 1993) UNLU, E; GUMGUM, B
    Copper and Zinc were determined in sediments and fish (Capoeta capoeta umbla) from the Tigris River in Turkey. Cu and Zn were found very high levels in the sediments and fish samples. This may be directly related to the contamination of the Tigris River by Ergani Copper Plant and the geochemical structure of this region.
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    DETERMINATION OF IRON BY ICP-AES IN STEREOREGULAR POLY(PROPYLENE OXIDE) PREPARED BY PRUITT-BAGGETT CATALYST
    (Marcel Dekker Inc, 1994) COLAK, N; GUMGUM, B
    Partially stereoregular poly(propylene oxide) (PPO) samples synthesized by Pruitt-Baggett catalyst (PBC) were dissolved in benzene, and Fe in the polymer was extracted with acidic aqueous solutions. The Fe in the polymer could be extracted gradually with 3 M HCl, but it could not be extracted with water and dilute HCI solutions. The Fe in the aqueous solutions was determined by ICP-AES (inductively coupled plasma-atomic emission spectrometry). It has been found that increasing the Fe in the aqueous solutions decreases the molecular weights of polymer samples.
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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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    THE ENRICHMENT OF LOW-GRADE MAZIDAGI PHOSPHATES BY CALCINATION AND EXTRACTION METHODS
    (Marcel Dekker Inc, 1987) GUNDUZ, T; GUMGUM, B
    [Abstract Not Available]
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    HEAVY-METAL POLLUTION IN WATER, SEDIMENT AND FISH FROM THE TIGRIS RIVER IN TURKEY
    (Pergamon-Elsevier Science Ltd, 1994) GUMGUM, B; UNLU, E; TEZ, Z; GULSUN, Z
    Some heavy metals (Co, Cu, Mo, Ni, Pb, V and Zn) were determined in water, sediments and some fish species (Cyprinion macrostomus and Garra rufa) from the Tigris River. Mo and V were not detected in water and Co, Cu, Ni, Pb, Zn were found low values. Co, Cu, Ni, Pb, V and Zn were found very high levels in the sediments. All the fish samples contain high concentrations of Cu, Ni and Zn, while Co, Mo, Pb and V were not detected. The high concentrations of heavy metals may be directly related to the contamination of the Tigris River by Ergani Copper Plant and the geochemical structure of this region.
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    PREPARATION, SPECTROSCOPIC INVESTIGATION AND CHARACTERIZATION OF MOLYBDOVANADOPHOSPHORIC ACID AND ITS COMPLEXES WITH N,N'-DIETHYLANILINE
    (Marcel Dekker Inc, 1993) GUMGUM, B; AKBA, O
    Free H4[PMo11VO40].32 H2O (molybdovanadophosphoric acid) was prepared reproducibly as an orange-red crystaline solid. The N,N'-diethylaniline complexes of the molybdovanadophosphoric acid were prepared and investigated for the first time. Various colored complexes were obtained depending on the solvents used and conditions.