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Articles by Ramazan GURKAN
Total Records ( 2 ) for Ramazan GURKAN
  Halil İbrahim ULUSOY , Ramazan GURKAN and Mehmet AKCAY
  In the present study, a novel catalytic-kinetic spectrophotometric method was developed for the determination of trace amounts of copper. It is based on the catalytic effect of Cu(II) on the reduction of brilliant cresyl blue (BCB) by ascorbic acid in pH 5.0 acetate buffer medium. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of BCB at 624 nm. The operating conditions regarding concentration of reagents, pH, time, and temperature were established and optimized in detail. The working curve was linear in the concentration range of 0.1-5.0 μ g L-1. The maximum percentage error and standard deviation for 5 replicate determination of the 3 μ g L-1 Cu(II) were 3.20 and 0.45, respectively. The detection limit and quantification limit were 0.025 and 0.086 μ g L-1, respectively. The procedure was successfully applied to determination of dissolved copper levels of 3 different natural spring waters and artificially prepared wastewater samples. The accuracy of the proposed kinetic method was tested by means of 5 replicate analyses of the certified standard materials, SRM 1640, based on 2 independent methods.
  Ramazan GURKAN , Tugba CEPKEN and Halil Ibrahim ULUSOY
  A new, reliable, surfactant-sensitized method is described for the spectrophotometric determination of total and dissolved inorganic mercury at trace levels. The method is based on the ternary complex formation of Hg(II) with 2-(2-thiazolylazo)-p-cresol and a cationic surfactant, cetylpyridinium chloride, at pH 9.5. The detection and quantification limits of the method with surfactant were 6 and 19 μ g L−1, while those of the method without surfactant were 22 and 67 μ g L−1, respectively. The method obeys Beer’s law at up to approximately 10 mg L−1 Hg(II) in an aqueous surfactant medium. The relative errors and relative standard deviations of the method were 2.2% and 3.2%, while those of the direct method were 11% and 4.4% (1.0 mg L−1, n = 10), respectively. The accuracy and reliability were examined by the recoveries of spiked solutions at 3 and 5 mg L−1 for the determination of mercury in tap water, drinking water, dental unit wastewater, and artificially prepared model water samples. It was found that the results were very good and comparable for both the present method and the modified dithizone method, which was used as an independent reference method. Speciation studies for binary mixtures containing Hg(I) plus Hg(II) ions at known concentration ratios were also conducted.
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