Comparative Study For Heavy Metal Concentration( Zn, Cu, Pb, Cd And Hg ) In Water, Sediments And Soft Tissue Of Anzali Lagoon Anodont (Anodonta Cygnea) Sampled In Two Seasons, Autumn And Spring ( 1383-1384)
2007
Ashja Ardalan, A., Member of Scientific Board, Faculty of Marine Science and Technology North Tehran Branch, Islamic Azad University. | Khoshkhoo, Zh., Ph.D Student of Scicnces and Research Branch, Islamic Azad University . | Rabbani, M., Member of Scientific Board Faculty of Marine Science and Technology North Tehran Branch, Islamic Azad University. | Moini, S., Member of Scientific Board Faculty of Agriculture, Tehran Univ.
Anzali lagoon is one of the most important aquatic ecosystems of Iran located in south-west of the Caspian sea. This lagoon is a habitat for valuable fishes and aquatic animals which have an important role in life cycle of this ecosystem. As bivalves can be considerd as bioandicators, Anodonta cygnea which is of the present bivalves in this habitat, are selected for investigation about heavy metals.In this study, from Selkeh area, where received waters from south part of the lagoon, 30 and 20 samples were collected randomly in Autumn (2004) and Spring(2005), respectively. Bivalves accompanied by water and sediments were collected as samples. Bivalves were transferred to laboratory alive and biometery was carried out. For analysis, first, soft body, water and sediments according to acidic digestion, were prepared. Then through atomic absorption spectrometer, four heavy metal concentration as zinc, copper, lead and cadmium present in soft body (male and female separately), water and Sediments in Autumn and Spring samples were determined. For mercury measurement, after preparation of bivalve, water and sediment samples by acidic digestion method, through atomic absorption with cold vapor production system, determination was done.Results showed that in male anodont, concentration of zinc in autumn and spring was 16.4 and 23.50 آµg/g wet weight, respectively followed by copper in Autumn and Spring with 0.58 and 0.77 آµg/g wet weight, respectively, more than the other heavy metals. In female anodont, concentration of zinc in Autumn and Spring was 7.9 and 15.37, respectively and after that concentration of copper with 0.89 and 0.69 آµg/g wet weight, respectively were more than the rest of the heavy metals. Concentration of the rest of the heavy metals, lead, cadmium and mercury, were insignificant and in most of the cases the concentration was lower than instrument limits. Presence of heavy metals in water showed that zinc in Autumn and Spring samples has 0.11 and 0.005 mg/l concentration, respectively, and the concentration of the other heavy metals were insignificant and in most of the cases was out of instrument limits. Heavy metal concentration in sediments showed that zinc concentration in Autumn and Spring were 82.5 and 87.5 آµg/g dry weight, respectively, have the highest value and mercury with 0.05 and 0.04 in mentioned seasons, respectively have the lowest concentration.
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