در حاشيه سواحل استان هرمزگان saccosterea cucullata و مرواريدساز pinctada radiata تعيين نسبت نيكل و واناديوم ناشي از آلودگي هاي نفتي در صدف خوراكي

A Determination of Nikel to Vanadium Ratio in P.radiata and S. cucullata Resulted from Oil Pollution in Coastal Fringes in Hormozgan Province

Due to importance of Persian Gulf in exploitation and transfer of fossil fuels as well as the ongoing regional political events, there is always a trend of entrance of pollutants into this aquatic ecosystem that also ends up in the body of sea animals. Vanadium and nickel are two important indicators of oil pollution. Lengthy exposion to these elements causes serious harmful effects in human health, different harsh allergies being examples, just to name some. In this study the amount of these elements as well as their ratio (N/Va) in S. Cucullata and P. radiata were determined. P. radiata samples were collected from four stations in Hormozgan provinceʹs coasts as well as from Hormoz peninsula. S.cucullata samples were collected from four stations in Hendurabi peninsula. Collection of samples was done in autumn and winter 2002. Following shell biometry, a digestion of samples was carried out using the international standard (Berman 1995, Method 7000). Ni was evaluated through atomic absorption, using philips Model PU9400. Vanadium was assessed using a Shimadez atomic absorption set, Model G670. The measurements were made for both crust and muscle in shells. The results indicate: Mean nickel and vanadium contents in S. cucullata are 6.32, 0.77, and in P.radiata they are 3.44 and 0.76 mgkg^-1 respectively. These elementʹs content in shell as well as in tissue exceeds the standard.ualues while at the same time shell content being more than that in tissue. The only source of V is realized to be oil pollutants where as sources other than oil pollutants can cause Ni contamination. There was no relationship observed between Ni & V contamination, and biometry (size and weight). There was a significant positive corellation found between V content in shell and tissue. There exhists a significant negative relationship between Ni and V in tissue. A significant relationship is observed between Ni, V content in S.cucullata shell and tissue. In S. cucullata there is also found a positive significant relationship between shell length and shell V content. Between tissue content of Ni and heel length in S. cucullata there exists a significant negative relationship.