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Heavy metals in sediments and their bioaccumulation in Phragmites australis in the Anzali wetland of Iran

Chinese Journal of Oceanology and Limnology 2016年第4期34卷 810-820页

作者： Marjan ESMAEILZADEH Abdolreza KARBASSI Faramarz MOATTAR Department of Environmental Science Faculty of Environment and Energy Tehran Science and Research Branch Islamic Azad University Department of Environmental Engineering Graduate Faculty of Environment University of Tehran

Accumulation of metals in both sediments and Phragmites australis organs was studied. Samples were collected from seven stations located in Anzali wetland, Iran. The samples were analyzed by inductively coupled plasma mass spectrometry(ICP-MS). The results showed that concentration of the studied metals(except As and Cd) were higher in sediments than in *** organs. Metal accumulation was found to be signifi cantly(P <0.05) higher in roots than in above-ground organs of ***. The bioaccumulation factor(BAF) and the transfer factor(TF) also verifi ed the highest rate of metal accumulation in roots and their reduced mobility from roots to the above-ground organs. Pearson correlation coeffi cient showed signifi cant relationships between metal concentrations in sediments and those in plant organs. It should be pointed out that sediment and plant samples exhibited higher metal concentrations in eastern and central parts than in western and southern parts of the wetland. The mean concentrations of all studied elements(except for Fe, V and Al) were higher in these sediment samples than in the Earth's crust and shale. High accumulation of metals in P. australis organs(roots and shoots) is indicative of their high bioavailability in sediments of the wetland. The correlation between metal concentrations in sediments and in P. australis indicates that plant organs are good bioindicators of metal pollution in sediments of Anzali wetland.

关键词： transfer factor bioaccumulation factor aquatic plant phytotoxic level trace elements

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