SEASONAL VARIATION OF HEAVY METALS (FE AND CU) IN RIVER GOMTI OF LUCKNOW CITY AND COMPARATIVE STUDY OF THEIR PHYTO ACCUMULATION BY TWO NATIVE MACROPHYTES TRAPA NATANS AND MIMULUS GLABRATUS

This study evaluates temporal peculiarity of Fe and Cu in river Gomti during three consecutive years and assesses the efficiency of two native macrophytes T. natans and M. glabratus in accumulation/removal of pollutants under in-situ and ex-situ. During the year 2009 Fe concentration ranged between 1.110-1.339 mg L-1 and Cu from 0.008-0.021 mg L-1 throughout pre-monsoon period whereas during post-monsoon Fe concentration was between 1.103-1.185 mg L-1 and Cu was recorded from 0.003-0.008 mg L-1. During the year 2010 and 2011, Fe concentration ranged between 1.122-1.384 mg L-1 and Cu ranged from 0.010 -0.023 mg L-1 in pre-monsoon period and in post-monsoon Fe ranged from 1.082-1.184 mg L-1 and Cu ranged from 0.04-0.09 mg L-1 in Gomti river water. Removal of Fe by T. natans was 64.4% in net house and accumulation was 56% and at river site the accumulation was 45% whereas in M. glabratus 56.6% removal and 47.6% accumulation was noted in net house and at river site 36% accumulation was noticed. T. natans removed Cu by 60% and accumulated 46.6% whereas M. glabratus removed 53% and accumulated 33% in net house and at river site Cu accumulation was 37% in T. natans and 29% increment of Cu was observed in M. glabratus. It resulted that T. natans showed more potential than M. glabratus in bio-accumulation of Fe and Cu from water.