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    Chemical analysis of geothermal water of Cermik, Turkey
    (Parlar Scientific Publications (P S P), 2003) Akba, O; Baysal, A; Hamamci, C; Merdivan, M; Gumgum, B
    Geothermal water of Cermik, which is located in Southeast Anatolia - Turkey, is a Na-Cl-HCO3 type containing also sulfide and iodide. The temperature, pH and flow rate of the geothermal water are 51 degreesC, 7.6 and 21 L s(-1), respectively. Its physical and chemical characterization in detail was done using standard methods. The trace elements Al, Ba, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sr and Zn were analyzed directly using inductively coupled plasma-atomic emission spectrometry due to very low detection limits and the good reproducibility of this analytical method.
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    Heavy metal levels in mullet, Liza abu (Heckel, 1843) (Mugilidae) from the Tigris River, Turkey
    (Birkhauser Verlag Ag, 1996) Unlu, E; Akba, O; Sevim, S; Gumgum, B
    The heavy metal levels in the muscle, liver, gonad, gill and intestine of mullet (Liza abu) from the Tigris River in Turkey were studied. The average levels showed that concentrations of Co, Ct, Cu, Mn, Ni and Zn in the mullet varied depending on different organs. Cd and Pb were not detected while Co was detected only in intestine samples. Cr, Cu, Mn. Ni and Zn were found in all the samples analyzed. All the fish samples contain high concentrations of Co, Cr, Cu, Mn, Ni and Zn. The high concentrations of heavy metals may be directly related to the contamination of the Tigris River by a copper plant.
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    Lead in urban street dust in Diyarbakir, Turkey
    (Inst Lebensmitteltechnologie Analytische Chemie, 1997) Hamamci, C; Gumgum, B; Akba, O; Erdogan, S
    Particulate matters were collected from thirteen locations in and around Diyarbakir(Turkey) in September 1995 to determine lead content. Lead analyses were performed with ICP-AES measured at 266.316 nm. The average concentrations of lead in urban street dust in Diyarbakir, Turkey was found to be 911 ppm (ranging from 616 to 1208 ppm).
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    Matrix effects of concomitant species on the determination of nickel by inductively coupled plasma atomic emission spectrometry
    (Mrs Pushpa Agarwal, 2005) Akba, O; Baysal, A; Merdivan, M; Hamamci, C; Gumgum, B
    The interference on the determination of nickel by the salts LiCl, NaCl, KCl, CsCl, NH4Cl, Na2SO4, NaNO3, NaC2H3O2 in an inductively coupled plasma-atomic emission spectrometry has been carried out. The salt concentration was in the 100-10000 mg L-1 range. Nickel emission was enhanced at lower matrix concentrations (100 mg L-1) and was depressed at higher matrix concentrations (10000 mg L-1). Except cesium, above 100 mg L-1, all studied ions caused a decrease in the signal intensity in the range of 0-15%. The sequence order of the investigated ions for the enhancement and depression was unstable. The sequence order in enhancement was found as Li+ < Na+ < K+ < Cs+ < NH4+ for cation; NO3- < SO42- < Cl- < OAc- for anions and Cs+ < NH4+ < K+ < Li+ < Na+ for cat-ions and OAc- < SO42- Cl- < NO3- for anions in depression at the studied lines.
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    Preparation and characterization of polyoxometallates of molybdenum, tungsten and their salts
    (Marcel Dekker Inc, 1997) Akba, O; Guzel, F; Yurdakoc, K; Gumgum, B; Tez, Z
    In this work, confirmation of the molecular formula and investigation of the structural stability of the prepared various types of heteropoly acids and their salts by TGA are reported. Specific surface areas of the samples were determined by the BET-single point N-2 adsorption method. Scanning electron microscopy (SEM) was used for the of surface topography of the samples in the sense of crystalline and amorphous states and the acidities of these solid samples were determined based on the color changes of suitable indicator solutions by the way of a butylamine titration method. Impurities, weight ratios and bonding states of the characteristic elements of the samples were determined from XRD, EDX and FTIR studies.