قياس معدل التراكم الحيوي لثلاثة عناصر ثقيلة في نوعين من الطحالب البحرية لشاطئ مدينة الخمس

الملخص EN

The aim of the study is to estimate the bioaccumulation of some heavy metals Lead (Pb), Cadmium (Cd) and Zinc (Zn) in two species of algae: (Enteromorpha compressa and Jania rubens;).

In addition, these elements were estimated in samples of sea water surrounding these algae.

These samples were collected from three sites in the city of Al-Khums (Beach of Al-Khums Park, Barco Beach and the beach opposite the Power and Desalination plant).

These samples were collected during the period from Autumn 2017 to Summer 2018 in order to know the extent of the accumulation of heavy elements in these organisms.

However, these organisms are considered part of the food chain, which are transferred to the human at the top of the food pyramid.

The concentrations of heavy metals in the studied samples were determined using the Atomic Absorption Spectroscopy (CONTRAA700analytikjena) at the Sadeem Laboratory.

After heavy metal extraction from samples sea water and samples algae, results show that, the concentration of the elements in most samples exceeded the limits allowed by the World Health Organization (WHO) and the Food and Agriculture Organization (FAO).

There was an obvious variation in the concentration of heavy elements in seawater at the three sites.

The highest concentration of Lead (Pb) and Zinc (Zn) were (15.25 and 20.1) mg/L, respectively, which were observed in summer at the Barco Beach site.

The highest concentration of cadmium (Cd) was (0.084) mg/L in Summer at the beach opposite to the Power and Desalination plant.

The bioconcentration factor (BCF) has been calculated.

The highest BCF values of Pb, were (570- 590) mg/L in E.compressaand J.rubens respectively times in accordance to its concentration of water.

As well as the highest BCF, values of Cd were (597.1-84.2) mg/L in E.compressa and J.rubens respectively times in accordance to its concentration of water.

Finally, BCF values of Zn were (181.4 and200.9) mg/L in E.compressa and J.

ruben srespectivelytimes in accordance to its concentration of water.

This means that there is a bioaccumulation in the selectively studied algeavaried according to type and location.