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    A study on seasonal changes of phosphorus fractions in marine sediments of the Akyaka Beach in Gokova Bay, Turkey
    (Springer, 2012) Yilmaz, Ebru; Koc, Cengiz
    The purpose of this study was to determine the changes of phosphorus fractions in marine water and sediments of the Akyaka Beach in Gokova Bay, Turkey. The values of the loosely bound phosphorus fraction, iron-bound phosphorus fraction (Fe-P), bound aluminium phosphorus fraction (Al-P), calcium-bound phosphorus fraction (Ca-P), and non-sequentially extracted phosphorus fractions (inorganic and organic phosphorus) were determined for the period of April 2007 to May 2008. Among the forms of phosphorus, phosphorus distribution ranges were 77% for inorganic phosphorus fraction, 21% for organic phosphorus fraction, 10% for loosely bound phosphorus fraction, 41% for Ca-bound P, 4% for Al-bound P, and 4% for Fe-bound P. The release values of inorganic phosphorus in the sediment samples ranged from 271 +/- A 0.03 to 1,156 +/- A 2.94 ppm. Inorganic phosphorus value was the highest in January and the lowest in November. Average value for the organic phosphorus in the beach was found to be 184.33 ppm, maximum value was observed in May as 315 +/- A 0.44 ppm, and minimum value was observed in March as 78 +/- A 0.01 ppm. Mean value for the loosely bound phosphorus fraction in the beach was found to be 115.5 ppm in the sediment samples. The mean values for the sequentially extracted phosphorus fractions in Akyaka Beach were standard error of the mean (SEM), 96 +/- A 0.04 ppm of iron-bound phosphorus fraction, SEM, 115 +/- A 0.01 ppm aluminium-bound phosphorus fraction, and 267 +/- A 0.02 to 869 +/- A 1.55 ppm calcium-bound phosphorus fraction. Consequently, the beach sediments are both phosphorus traps and phosphorus sources. Here, the important point is that external loading can be limited to maintain the present nutrition level of the beach. Even if the phosphorus from external resources is limited, phosphorus based on internal sources is observed to penetrate into liquid environment.
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    Öğe
    RESEARCH ON WATER QUALITY OF LAKE BAFA IN TURKEY
    (Gh Asachi Technical Univ Iasi, 2014) Yilmaz, Ebru; Koc, Cengiz
    The Lake Bafa is an alluvial bar lake located in the Aegean Region in the Big Meander river basin in Aydin and Mugla provinces. However, the lake is currently threatened by severe pollution, being under the risk of serious degradation because of (i) uncontrolled urbanization; (ii) point and non-point source pollution; (iii) algae bloom; (iv) sediment transportation and pollution via influent creeks to the lake; and (v) severe degradation of the natural wetlands within its drainage basin. In this study, the water samples taken from 8 different stations which were inside and the shores of the Lake Bafa in February 2009, 2010 and August 2009, 2010. The stations that were spotted in the lake were analyzed for the physical and chemical changes taking place in water quality. Temperature, pH, EC, CO3, HCO3, Cl-, NO2, NO3, DO, o-PO4, Na, K+, Ca2+ and Mg2+ parameters were measured. In the analyses, August and February months were chosen and their pollution loads were compared. Because of the fact that tourism activities generally increase in Lake Bafa, especially in August, domestic water discharges go up. Therefore, these rises cause pollution load in lake in August. On the other hand, Lake Bafa just serves for fishing boats in February, so pollution rate in February is not as much as in August within Lake. In other words, water pollution in August is higher than pollution in February.