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    Adsorption of Cu2+ and Pb2+ ion on dolomite powder
    (ELSEVIER SCIENCE BV, 2009) Pehlivan, Erol; Ozkan, Ali Mujdat; Dinc, Salih; Parlayici, Serife
    Natural Turkish dolomite was shown to be effective for removing Cu2+ and Pb2+ from aqueous solution. Selected information on pH, dose required, initial metal concentration, adsorption capacity of the raw dolomite powder was evaluated for its efficiency in adsorbing metal ions. Dolomite exhibited good Cu2+ and Pb2+ removal levels at all initial metal amount tested (0.04-0.32 mmol, 20 mL). It is important to note that the adsorption capacities of the materials in equilibrium vary, depending on the characteristics of the individual adsorbent, the initial concentration of the adsorbate and pH of the solution. One hour was enough for the removal of metal ions from (0.2 mmol in 20 mL) aqueous solution. Effective removal of metal ions was demonstrated at pH values of 5.0. The adsorptive behavior of dolomite was described by fitting data generated from the study of the Langmuir and Freundlich isotherm models. The adsorption capacity of dolomite was found as 8.26 mg for Cu2+ and 21.74 mg for Pb2+, respectively, from the calculation of adsorption isotherm equation. More than 85% of studied cations were removed by dolomite from aqueous solution in single step. The mechanism for cations removal by dolomite includes surface complexation and ion exchange. (C) 2009 Elsevier B.V. All rights reserved.
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    Geochemical features of the MenteAYe Formation dolostones (Rhaetian) in the Karacahisar-KasA +/- mlar area (Isparta-Turkey)
    (SPRINGER HEIDELBERG, 2018) Ozkan, Ali Mujdat; Dinc, Salih
    The purpose of this study is to determine the geochemical characteristics of the MenteAYe dolostones (Rhaetian) in the west Taurus Mountains, Turkey. The isotope characteristics of the MenteAYe dolostones show a variation in the delta O-18 values of the dolomites between + 1.35 and - 2.72aEuro degrees (VPDB) and a variation in the delta C-13 values of the dolomites between + 1.6 and + 3.33aEuro degrees (VPDB). Most of the MenteAYe dolostone samples have positive oxygen isotope values; others have weak negative isotope values, which indicate early diagenetic development. In addition, oxygen, carbon, and strontium isotopes and trace element analyses suggest that these dolostones were probably resulted from insignificant recrystallizaion process than chemically similar fluids. Furthermore, Mn/Sr values of the MenteAYe dolostones indicate that there is no significant diagenetic alteration. The total REE contents of the MenteAYe Formation dolostones display a strong positive correlation with Si, Al, Fe, K, Ti, Ba, Rb and negative correlation with Mg, hence REE content is associated with in the first degree titanium-bearing minerals (probably sphene, rutile, anatase), second degree phosphate (apatite), and barium and rubidium-bearing minerals (probably barite). Ce anomalies versus Nd concentrations of the MenteAYe dolostone samples indicate that these dolostones are formed in an anoxic environment. In addition, the K/Rb ratios of the MenteAYe dolostones are not exposed to any metamorphism and indicate some diagenetic alteration. Calculated temperature values using delta O-18 values of the MenteAYe dolostones yield precipitation temperatures of 17 to 42 A degrees C, and suggest burial depths of 67 to 900 m. Sources of magnesium for dolomitization of the MenteAYe Formation carbonates were most likely fluids from seawater and/or diagenetic brines (slightly modified seawater). The MenteAYe dolostones formed as early diagenetic (Rhaetian to Cenomanian) in shallow burial areas at lower temperatures than seawater and/or diagenetic brines (slightly modified seawater).
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    PETROGRAPHIC AND GEOCHEMICAL CHARACTERISTICS OF DOLOMITES OF KIZILOREN FORMATION (KONYA, TURKEY)
    (INT SCIENTIFIC CONFERENCE SGEM, 2008) Dinc, Salih; Orhan, Hukmu
    The Upper Triassic-Lower Jurassic Kiziloren formation outcroping around the Kiziloren mountain, 40 kin to the west of Konya begin with dolomite at the base and, grades upward into calcitic dolomite, dolomitic limestone and limeston,. Dolomites are two types; mimetic and non-mimetic. In mimetic dolomit, pellet fossils, ooid and intraclast were poartially or totaly preserved. In non-mimetic dolomite, the depositional texture were totally destroyed. It is composed of euhedral, hemihedral, dirty-brownish coloured, non zoned and fine to coarse dolomite crystals with linear and intended crsytal boundaries. The CaCO(3), MgCO(3) ratios and Sr, Mn, Fe content of dolomites are determined as % 53-61 mol, % 39-47 mol and 65-171 ppm, 3-37 ppm, % 0,01-0,12 respectively. Having a MgCO(3) ratio close to % 50 and a low Sr content are interpreted as the dolomite in the study area was approached to the stoichiometric dolomite. The Sr(+2)/Ca(+2) ratio of dolomitization solution was calculated as having a range between 0,023-0,066. This is higher than present day sea water, and can be interpreted as either the Sr(+2)/Ca(+2) ratio of oceanwater when Kiziloren formation formed was higher than today seawater or unsufficient removal of Sr in diagenetic environment during transformation processes of aragonitic limestone to dolomite.