Homa Dalyanı'ndaki sülüneslerde(Solen marginatus) ağır metallerin birikimi

In this thesis, the concentrations of heavy metals (aluminum, cadmium, chromium, copper, lead, iron, manganese, mercury and zinc) were investigated in razor shell from the Homa Lagoon. The study area, the Homa Lagoon is an active lagoon where is located in north of İzmir Bay. The Homa Lagoon is an important coastal wetland ecosystem and in terms of pollution, it is under the influence of Gediz River and Izmir Bay. Solen marginatus samples were collected seasonally in May 2015 to November 2017 from the Homa Lagoon. During 2015-2016 sampling period, whole tissues were separated from shells of S.marginatus. In 2017 sampling period, hepatopancreas and soft tissues were dissected. For calculation of bioaccumulation factor (BAF), sediment samples were collected at sampling location from lagoon in May 2017. The heavy metal analyses were performed by using atomic absorption spectrophotometer (AAS). The statistical analyses (ANOVA, Kruskal-Wallis and correlation tests) were applied to assess significant differences of metal concentrations between seasons and tissues. In this study, the maximum levels of metal were generally observed in spring and summer periods. Hepatopancreas generally more accumulate metals than soft tissues. According to BAF ratio, significant values were found for mercury, cadmium and zinc in both tissues. In point of human health risk assessment, metal results were compared with PTWI (Provisional Tolerable Weekly Intake) values of international regulations. The concentrations of chromium, copper, iron and aluminum in Solen marginatus were found above permissible values.