Yazar "Yilmaz, Erkan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Characterization of Heavy Metal Fractions in Agricultural Soils by Sequential Extraction Procedure: The Relationship Between Soil Properties and Heavy Metal Fractions
    (Taylor & Francis Inc, 2015) Sungur, Ali; Soylak, Mustafa; Yilmaz, Erkan; Yilmaz, Selehattin; Ozcan, Hasan
    The present research was conducted to determine heavy metals in agricultural soils from canakkale, Turkey, using a sequential extraction procedure (acid soluble, reducible, oxidizable, and residual) as proposed by the Community Bureau of Reference (BCR) of the European Commission. Soil samples were taken from 12 different cultivated sites and analyzed for Cd, Co, Cr, Cu, Mn, Ni, Pb, and Zn concentrations. The results revealed an order of Mn > Cd > Pb > Co > Ni > Cu > Zn > Cr for the heavy metals based on the sum of the first three fractions (acid soluble + reducible + oxidizable). The relationships between soil properties and each metal fraction were identified through Pearsons's correlation analysis. Hierarchical cluster analysis was performed to determine the behaviors and similarities of metals in each fraction. While Mn, Pb, and Zn exhibited subjective behaviors in the acid-soluble fraction, Cd, Co, Cu, Cr, and Ni exhibited similar behaviors with each other.
  • [ X ]
    Öğe
    Variations in Türkiye's sea surface temperatures
    (Royal Danish Geographical Soc, 2024) Yilmaz, Erkan; Acar, Zahide
    In the world, there is a general increase in sea surface temperatures with higher values reaching in enclosed seas. T & uuml;rkiye is surrounded by these enclosed seas, and sea surface temperatures have been measured since the 1940s. Since most of the stations contained missing data, only 23 stations were used in the study. First of all, the distribution of sea surface temperatures was determined, and then annual and monthly trends were revealed using Mann-Kendall series correlation analysis and Sen slope value. As a result of the study, it was seen that the annual average sea surface temperatures in Fethiye, Ordu, Finike, & Ccedil;anakkale, Ku & scedil;adas & imath;, Sinop, Konak and Sar & imath;yer stations have a significant increase trend. Monthly trends show different patterns depending on the seas, with increases in the Mediterranean during the beginning of summer, in the Aegean and Marmara seas during the winter, and in the Black Sea coast during the summer. The analysis shows that the rate of increase in the Mediterranean is 0.67 degrees C/decade and 2 degrees C/decade in the Aegean and Marmara seas and the Black Sea coast. In the Black Sea, the increase in the average maximum sea surface temperature in June at Giresun station is 4 degrees C/decade.