investigation on concentration of elements in wetland sediments and aquatic plants

the major aim of the present study was to investigate element (fe, ni, pb, v, zn) concentrations in sediment and different tissues of phragmities australis and typha latifolia in hor al-azim wetland southwest iran. sampling of sediments and aquatic plants was carried out during spring and summer 2014. results showed that the mean  concentrations of elements in phragmities australis  in root and stem-leaf were as follows: iron:4448 mg/kg, nickel: 28 mg/kg, lead:8 mg/kg, vanadium:10 mg/kg  and zinc 15.5 mg/kg in root and: fe:645 mg/kg, ni:15 mg/kg, pb:4 mg/kg, v:4 mg/kg and zinc 16 mg/kg respectively. also, the mean concentrations of fe, ni, pb, v and zn in roots of typha latifolia were 8696 mg/kg, 34 mg/kg, 5 mg/kg, 19 mg/kg and 27 mg/kg respectively. the mean concentrations of fe, ni, v, pb, zn in stem-leaves of typha latifolia were as follows: 321 mg/kg, 3 mg/kg, 7 mg/kg, 2 mg/kg and 14 mg/kg respectively. the mean concentrations of fe, ni, v, pb and zinc were as: 40991 mg/kg, 65 mg/kg, 60 mg/kg, 31 mg/kg, 60 mg/kg respectively in surface sediment of study area. concentration pattern of elements in sediment were as: fe>ni>zn>v>pb. the highest concentration of elements in the plant was seen in the roots. also, typha latifolia can uptake more concentration of elements than phragmities australis. based on the enrichment factor, ni in summer had the highest ef values among the elements studied and it has a moderate enrichment.