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Macroalgae is used as a bioindicator for their accumulation capacity of potentially hazardous elements. Ulva spp. was used extensively in previous studies as in the recent study. Along the Mersin coast, sampling was made in four different locations (Çamlıbel Marina, Pozcu Marina, Deniz Feneri, Karaduvar) during the spring and summer seasons between 2015-2016. For elemental analyses, ICP-MS was used, and Mg, Al, K, Ti, Cr, Mn, As, Se, Sr, Mo levels were analyzed in Ulva rigida samples. The highest level (134960.0 µg g-1) was found in the elemental analysis of Mg, and the lowest levels (20.83 µg g-1) were found in the elemental analysis of Se. Potentially hazardous trace elements (Al, Ti, Cr, Sr, As, Mn) were found in high levels in all seasons and sampling points in comparison to other studies. The abundance in other elements (Mg, K, Mo, and Se) was also notable in the same sense. The seasonal difference seems to have little effect on the accumulation of trace elements for our study. Pozcu Marina and Karaduvar stations are good sampling points in regard to monitor potentially toxic elements in macroalgae tissue.
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